chore: integrate filtermail's .github directory into relay's

It looks like the reason it exists in the default configuration
is an example for <https://www.postfix.org/FILTER_README.html>
Using this filter requires configuration such as
"-o content_filter=filter:dummy" and we don't have it.

.dockerignore

@@ -1,18 +0,0 @@
-data/
-venv/
-__pycache__
-*.pyc
-*.orig
-*.ini
-.pytest_cache
-.env
-
-# Slim build context — .git/ alone can be 100s of MB
-.git
-.github/
-docs/
-tests/
-
-# Exclude markdown files but keep www/src/*.md (used by WebsiteDeployer)
-*.md
-!www/**/*.md

.github/dependabot.yml

@@ -0,0 +1,15 @@
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/filtermail"
+    schedule:
+      interval: "monthly"
+    cooldown:
+      default-days: 7
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7

.github/workflows/chatmaild-ci.yml

@@ -0,0 +1,35 @@
+name: chatmaild CI
+
+on:
+  # Triggers when a PR is merged into main or a direct push occurs
+  push:
+    branches: [ "main" ]
+    
+  # Triggers for any PR (and its subsequent commits) targeting the main branch
+  pull_request:
+    branches: [ "main" ]
+
+permissions: {}
+
+# Newest push wins: Prevents multiple runs from clashing and wasting runner efforts
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tox:
+    name: isolated chatmaild tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        # Checkout pull request HEAD commit instead of merge commit
+        # Otherwise `test_deployed_state` will be unhappy.
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          persist-credentials: false
+      - name: download filtermail
+        run: curl -L https://github.com/chatmail/filtermail/releases/download/v0.7.4/filtermail-x86_64 -o /usr/local/bin/filtermail && chmod +x /usr/local/bin/filtermail
+      - name: run chatmaild tests 
+        working-directory: chatmaild
+        run: pipx run tox
+

.github/workflows/ci-no-dns.yaml

@@ -0,0 +1,40 @@
+name: No-DNS
+
+on:
+  # Triggers when a PR is merged into main or a direct push occurs
+  push:
+    branches: [ "main" ]
+    
+  # Triggers for any PR (and its subsequent commits) targeting the main branch
+  pull_request:
+    branches: [ "main" ]
+
+permissions: {}
+
+# Newest push wins: Prevents multiple runs from clashing and wasting runner efforts
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+
+jobs:
+  no-dns:
+    name: LXC deploy and test
+    uses: chatmail/cmlxc/.github/workflows/lxc-test.yml@main
+    with:
+      cmlxc_version: main
+      cmlxc_commands: |
+        cmlxc init 
+        # single cmdeploy relay test
+        cmlxc -v deploy-cmdeploy --source ./repo --type ipv4 cm0
+        cmlxc -v test-cmdeploy cm0
+
+        # cross cmdeploy relay test (two ipv4 relays)
+        cmlxc -v deploy-cmdeploy --source ./repo --ipv4-only --type ipv4 cm1
+        cmlxc -v test-cmdeploy cm0 cm1
+
+        # cross cmdeploy/madmail relay tests
+        cmlxc -v deploy-madmail mad0
+        cmlxc -v test-cmdeploy cm0 mad0
+        cmlxc -v test-mini mad0 cm0
+        cmlxc -v test-mini cm0 mad0

.github/workflows/ci.yaml

@@ -1,30 +1,31 @@
-name: CI
+name: cmdeploy CI
 
 on:
-  pull_request:
+  # Triggers when a PR is merged into main or a direct push occurs
   push:
+    branches: [ "main" ]
+    
+  # Triggers for any PR (and its subsequent commits) targeting the main branch
+  pull_request:
+    branches: [ "main" ]
+
+permissions: {}
+
+# Newest push wins: Prevents multiple runs from clashing and wasting runner efforts
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 
 jobs:
-  tox:
-    name: isolated chatmaild tests
+  cmdeploy:
+    name: cmdeploy tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-        # Checkout pull request HEAD commit instead of merge commit
-        # Otherwise `test_deployed_state` will be unhappy.
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
-      - name: download filtermail
-        run: curl -L https://github.com/chatmail/filtermail/releases/download/v0.5.2/filtermail-x86_64 -o /usr/local/bin/filtermail && chmod +x /usr/local/bin/filtermail
-      - name: run chatmaild tests 
-        working-directory: chatmaild
-        run: pipx run tox
-
-  scripts:
-    name: deploy-chatmail tests 
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
+          persist-credentials: false
 
       - name: initenv 
         run: scripts/initenv.sh
@@ -38,5 +39,29 @@ jobs:
       - name: run deploy-chatmail offline tests 
         run: pytest --pyargs cmdeploy 
 
-      # all other cmdeploy commands require a staging server 
-      # see https://github.com/deltachat/chatmail/issues/100
+  lxc-test:
+    name: LXC deploy and test
+    uses: chatmail/cmlxc/.github/workflows/lxc-test.yml@main
+    with:
+      cmlxc_version: main
+      cmlxc_commands: |
+        sudo apt-get update && sudo apt-get install -y musl-tools
+        rustup target add x86_64-unknown-linux-musl
+        export CARGO_TARGET_X86_64_UNKNOWN_LINUX_MUSL_LINKER=musl-gcc
+        cd repo/filtermail && RUSTFLAGS="-Ctarget-feature=+crt-static -Clink-self-contained=yes" cargo build --release --target x86_64-unknown-linux-musl
+        cmlxc init 
+        # single cmdeploy relay test
+        cmlxc -v deploy-cmdeploy --source ./repo cm0
+        cmlxc -v test-mini cm0
+        cmlxc -v test-cmdeploy cm0
+
+        # cross cmdeploy relay test
+        cmlxc -v deploy-cmdeploy --source ./repo --ipv4-only cm1
+        cmlxc -v test-cmdeploy cm0 cm1
+
+        # cross cmdeploy/madmail relay tests
+        cmlxc -v deploy-madmail mad0
+        cmlxc -v test-cmdeploy cm0 mad0
+        cmlxc -v test-mini cm0 mad0
+        cmlxc -v test-mini mad0 cm0
+

.github/workflows/deploy.yaml

@@ -1,375 +0,0 @@
-name: Deploy
-
-on:
-  push:
-    branches:
-      - main
-      - j4n/docker-pr
-  pull_request:
-    paths-ignore:
-      - 'scripts/**'
-      - '**/README.md'
-      - 'CHANGELOG.md'
-      - 'LICENSE'
-
-env:
-  REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
-
-jobs:
-  build-docker:
-    name: Build Docker image
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-    outputs:
-      image: ${{ steps.image-ref.outputs.image }}
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to GHCR
-        if: github.event_name == 'push'
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Extract metadata (tags, labels)
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          tags: |
-            # Tagged releases: v1.2.3 -> :1.2.3, :1.2, :latest
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-            # Branch pushes: foo/docker-pr -> :foo-docker-pr
-            type=ref,event=branch
-            # Always: :sha-<hash>
-            type=sha
-
-      - name: Build and push
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: docker/chatmail_relay.dockerfile
-          push: ${{ github.event_name == 'push' }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
-          build-args: |
-            GIT_HASH=${{ github.sha }}
-
-      - name: Output image reference
-        id: image-ref
-        run: |
-          SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-7)
-          IMAGE="${{ env.REGISTRY }}/$(echo "${{ env.IMAGE_NAME }}" | tr '[:upper:]' '[:lower:]'):sha-${SHORT_SHA}"
-          echo "image=${IMAGE}" >> "$GITHUB_OUTPUT"
-
-  deploy:
-    name: Deploy to ${{ matrix.host }}
-    needs: build-docker
-    # dont do the regular tests on this branch
-    if: >-
-      !cancelled() && (
-        github.event_name == 'push' ||
-        (github.event_name == 'pull_request' && !startsWith(github.head_ref, 'j4n/'))
-      )
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - host: staging2.testrun.org
-            acme_dir: acme
-            dkim_dir: dkimkeys
-            zone_file: staging.testrun.org-default.zone
-            disable_ipv6: false
-            add_ssh_keys: true
-          - host: staging-ipv4.testrun.org
-            acme_dir: acme-ipv4
-            dkim_dir: dkimkeys-ipv4
-            zone_file: staging-ipv4.testrun.org-default.zone
-            disable_ipv6: true
-            add_ssh_keys: false
-    environment:
-      name: ${{ matrix.host }}
-      url: https://${{ matrix.host }}/
-    concurrency: ${{ matrix.host }}
-    steps:
-      # --- Common setup ---
-
-      - uses: actions/checkout@v4
-
-      - name: prepare SSH and save ACME/DKIM
-        env:
-          HOST: ${{ matrix.host }}
-          ACME_DIR: ${{ matrix.acme_dir }}
-          DKIM_DIR: ${{ matrix.dkim_dir }}
-          ZONE: ${{ matrix.zone_file }}
-        run: |
-          mkdir ~/.ssh
-          echo "${{ secrets.STAGING_SSH_KEY }}" >> ~/.ssh/id_ed25519
-          chmod 600 ~/.ssh/id_ed25519
-          ssh-keyscan ${HOST} > ~/.ssh/known_hosts
-          # save previous acme & dkim state (trailing slash = copy contents)
-          rsync -avz root@${HOST}:/var/lib/acme/ ${ACME_DIR}/ || true
-          rsync -avz root@${HOST}:/etc/dkimkeys/ ${DKIM_DIR}/ || true
-          # backup to ns.testrun.org if contents are useful
-          if [ -f ${DKIM_DIR}/opendkim.private ]; then
-            rsync -avz -e "ssh -o StrictHostKeyChecking=accept-new" ${DKIM_DIR}/ root@ns.testrun.org:/tmp/${DKIM_DIR}/ || true
-          fi
-          if [ "$(ls -A ${ACME_DIR}/certs 2>/dev/null)" ]; then
-            rsync -avz -e "ssh -o StrictHostKeyChecking=accept-new" ${ACME_DIR}/ root@ns.testrun.org:/tmp/${ACME_DIR}/ || true
-          fi
-          # make sure CAA record isn't set
-          scp -o StrictHostKeyChecking=accept-new .github/workflows/${ZONE} root@ns.testrun.org:/etc/nsd/${HOST}.zone
-          ssh root@ns.testrun.org sed -i '/CAA/d' /etc/nsd/${HOST}.zone
-          ssh root@ns.testrun.org nsd-checkzone ${HOST} /etc/nsd/${HOST}.zone
-          ssh root@ns.testrun.org systemctl reload nsd
-
-      - name: rebuild VPS
-        env:
-          SERVER_ID: ${{ matrix.host == 'staging2.testrun.org' && secrets.STAGING_SERVER_ID || secrets.STAGING_IPV4_SERVER_ID }}
-        run: |
-          curl -X POST \
-            -H "Authorization: Bearer ${{ secrets.HETZNER_API_TOKEN }}" \
-            -H "Content-Type: application/json" \
-            -d '{"image":"debian-12"}' \
-            "https://api.hetzner.cloud/v1/servers/${SERVER_ID}/actions/rebuild"
-
-      - run: scripts/initenv.sh
-      - name: append venv/bin to PATH
-        run: echo venv/bin >>$GITHUB_PATH
-
-      - name: wait for VPS rebuild
-        id: wait-for-vps
-        env:
-          HOST: ${{ matrix.host }}
-        run: |
-          rm ~/.ssh/known_hosts
-          while ! ssh -o ConnectTimeout=180 -o StrictHostKeyChecking=accept-new root@${HOST} id -u ; do sleep 1 ; done
-
-      - name: restore ACME/DKIM
-        env:
-          HOST: ${{ matrix.host }}
-          ACME_DIR: ${{ matrix.acme_dir }}
-          DKIM_DIR: ${{ matrix.dkim_dir }}
-        run: |
-          # download from ns.testrun.org
-          rsync -e "ssh -o StrictHostKeyChecking=accept-new" -avz root@ns.testrun.org:/tmp/${ACME_DIR}/ acme-restore/ || true
-          rsync -avz root@ns.testrun.org:/tmp/${DKIM_DIR}/ dkimkeys-restore/ || true
-          # restore to VPS
-          rsync -avz acme-restore/ root@${HOST}:/var/lib/acme/ || true
-          rsync -avz dkimkeys-restore/ root@${HOST}:/etc/dkimkeys/ || true
-          ssh root@${HOST} chown root:root -R /var/lib/acme || true
-
-      - name: bare offline tests
-        if: github.ref == 'refs/heads/main' || github.event_name == 'pull_request'
-        run: pytest --pyargs cmdeploy
-
-      - name: bare deploy
-        if: github.ref == 'refs/heads/main' || github.event_name == 'pull_request'
-        env:
-          HOST: ${{ matrix.host }}
-          DISABLE_IPV6: ${{ matrix.disable_ipv6 }}
-        run: |
-          ssh root@${HOST} 'apt update && apt install -y git python3.11-venv python3-dev gcc'
-          ssh root@${HOST} 'git clone https://github.com/chatmail/relay'
-          ssh root@${HOST} "cd relay && git checkout ${{ github.head_ref || github.ref_name }}"
-          ssh root@${HOST} 'cd relay && scripts/initenv.sh'
-          ssh root@${HOST} "cd relay && scripts/cmdeploy init ${HOST}"
-          if [ "${DISABLE_IPV6}" = "true" ]; then
-            ssh root@${HOST} "sed -i 's#disable_ipv6 = False#disable_ipv6 = True#' relay/chatmail.ini"
-          fi
-          ssh root@${HOST} "sed -i 's/#\s*mtail_address/mtail_address/' relay/chatmail.ini"
-          ssh root@${HOST} "cd relay && scripts/cmdeploy run --verbose --skip-dns-check --ssh-host localhost"
-
-      - name: bare DNS
-        if: github.ref == 'refs/heads/main' || github.event_name == 'pull_request'
-        env:
-          HOST: ${{ matrix.host }}
-          ZONE: ${{ matrix.zone_file }}
-        run: |
-          ssh root@${HOST} chown opendkim:opendkim -R /etc/dkimkeys
-          ssh root@${HOST} "cd relay && scripts/cmdeploy dns --zonefile staging-generated.zone --ssh-host localhost"
-          ssh root@${HOST} cat relay/staging-generated.zone >> .github/workflows/${ZONE}
-          cat .github/workflows/${ZONE}
-          scp .github/workflows/${ZONE} root@ns.testrun.org:/etc/nsd/${HOST}.zone
-          ssh root@ns.testrun.org nsd-checkzone ${HOST} /etc/nsd/${HOST}.zone
-          ssh root@ns.testrun.org systemctl reload nsd
-
-      - name: bare integration tests
-        if: github.ref == 'refs/heads/main' || github.event_name == 'pull_request'
-        env:
-          HOST: ${{ matrix.host }}
-        run: ssh root@${HOST} "cd relay && CHATMAIL_DOMAIN2=ci-chatmail.testrun.org scripts/cmdeploy test --slow --ssh-host localhost"
-
-      - name: bare final DNS check
-        if: github.ref == 'refs/heads/main' || github.event_name == 'pull_request'
-        env:
-          HOST: ${{ matrix.host }}
-        run: ssh root@${HOST} "cd relay && scripts/cmdeploy dns -v --ssh-host localhost"
-
-      # --- Docker deploy (push only, runs even if bare failed) ---
-
-      - name: stop bare services
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        env:
-          HOST: ${{ matrix.host }}
-        run: |
-          ssh root@${HOST} 'systemctl stop postfix dovecot nginx opendkim unbound filtermail doveauth chatmail-metadata iroh-relay mtail fcgiwrap acmetool 2>/dev/null || true'
-
-      - name: install Docker on VPS
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        env:
-          HOST: ${{ matrix.host }}
-        run: |
-          ssh root@${HOST} 'apt-get update && apt-get install -y ca-certificates curl'
-          ssh root@${HOST} 'install -m 0755 -d /etc/apt/keyrings'
-          ssh root@${HOST} 'curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc && chmod a+r /etc/apt/keyrings/docker.asc'
-          ssh root@${HOST} 'echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian $(. /etc/os-release && echo $VERSION_CODENAME) stable" > /etc/apt/sources.list.d/docker.list'
-          ssh root@${HOST} 'apt-get update && apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin'
-
-      - name: prepare Docker bind mounts
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        env:
-          HOST: ${{ matrix.host }}
-        run: |
-          ssh root@${HOST} 'mkdir -p /srv/chatmail/certs /srv/chatmail/dkim'
-          ssh root@${HOST} 'cp -a /var/lib/acme/. /srv/chatmail/certs/ && cp -a /etc/dkimkeys/. /srv/chatmail/dkim/' || true
-
-      - name: generate and upload chatmail.ini
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        env:
-          HOST: ${{ matrix.host }}
-        run: |
-          cmdeploy init ${HOST}
-          sed -i 's/#\s*mtail_address/mtail_address/' chatmail.ini
-          scp chatmail.ini root@${HOST}:/srv/chatmail/chatmail.ini
-
-      - name: deploy with Docker
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        env:
-          HOST: ${{ matrix.host }}
-        run: |
-          GHCR_IMAGE="${{ needs.build-docker.outputs.image }}"
-          rsync -avz --exclude='.git' --exclude='venv' --exclude='__pycache__' ./ root@${HOST}:/srv/chatmail/relay/
-          # Login to GHCR on VPS and pull pre-built image
-          echo "${{ secrets.GITHUB_TOKEN }}" | ssh root@${HOST} 'docker login ghcr.io -u ${{ github.actor }} --password-stdin'
-          ssh root@${HOST} "docker pull ${GHCR_IMAGE}"
-          ssh root@${HOST} "cd /srv/chatmail/relay && CHATMAIL_IMAGE=${GHCR_IMAGE} MAIL_DOMAIN=${HOST} docker compose -f docker-compose.yaml -f docker/docker-compose.ci.yaml up -d"
-
-      - name: wait for container healthy
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        env:
-          HOST: ${{ matrix.host }}
-        run: |
-          # Stream journald inside the container
-          ssh root@${HOST} 'docker exec chatmail journalctl -f --no-pager' &
-          LOG_PID=$!
-          trap "kill $LOG_PID 2>/dev/null || true" EXIT
-          for i in $(seq 1 60); do
-            status=$(ssh root@${HOST} 'docker inspect --format={{.State.Health.Status}} chatmail 2>/dev/null' || echo "missing")
-            echo "  [$i/60] status=$status"
-            if [ "$status" = "healthy" ]; then
-              echo "Container is healthy."
-              exit 0
-            fi
-            if [ "$status" = "unhealthy" ]; then
-              echo "Container is unhealthy!"
-              break
-            fi
-            sleep 5
-          done
-          echo "Container did not become healthy."
-          kill $LOG_PID 2>/dev/null || true
-          echo "--- failed units ---"
-          ssh root@${HOST} 'docker exec chatmail systemctl --failed --no-pager' || true
-          echo "--- service logs ---"
-          ssh root@${HOST} 'docker exec chatmail journalctl -u dovecot -u postfix -u nginx -u unbound --no-pager -n 50' || true
-          echo "--- listening ports ---"
-          ssh root@${HOST} 'docker exec chatmail ss -tlnp' || true
-          echo "--- chatmail.ini ---"
-          ssh root@${HOST} 'docker exec chatmail cat /etc/chatmail/chatmail.ini' || true
-          exit 1
-
-      - name: show container state
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        env:
-          HOST: ${{ matrix.host }}
-        run: |
-          echo "--- listening ports ---"
-          ssh root@${HOST} 'docker exec chatmail ss -tlnp'
-          echo "--- chatmail.ini ---"
-          ssh root@${HOST} 'docker exec chatmail cat /etc/chatmail/chatmail.ini'
-
-      - name: Docker offline tests
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        run: CHATMAIL_DOCKER=chatmail pytest --pyargs cmdeploy
-
-      - name: Docker DNS
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        env:
-          HOST: ${{ matrix.host }}
-          ZONE: ${{ matrix.zone_file }}
-        run: |
-          # Reset zone file in case bare DNS already appended to it
-          git checkout .github/workflows/${ZONE}
-          ssh root@${HOST} 'docker exec chatmail chown opendkim:opendkim -R /etc/dkimkeys'
-          ssh root@${HOST} 'docker exec chatmail cmdeploy dns --ssh-host @local --zonefile /opt/chatmail/staging.zone --verbose'
-          ssh root@${HOST} 'docker cp chatmail:/opt/chatmail/staging.zone /tmp/staging.zone'
-          scp root@${HOST}:/tmp/staging.zone staging-generated.zone
-          cat staging-generated.zone >> .github/workflows/${ZONE}
-          cat .github/workflows/${ZONE}
-          scp .github/workflows/${ZONE} root@ns.testrun.org:/etc/nsd/${HOST}.zone
-          ssh root@ns.testrun.org nsd-checkzone ${HOST} /etc/nsd/${HOST}.zone
-          ssh root@ns.testrun.org systemctl reload nsd
-
-      - name: Docker integration tests
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        run: CHATMAIL_DOCKER=chatmail CHATMAIL_DOMAIN2=ci-chatmail.testrun.org cmdeploy test --slow
-
-      - name: Docker final DNS check
-        if: >-
-          !cancelled() && github.event_name == 'push'
-          && steps.wait-for-vps.outcome == 'success'
-        env:
-          HOST: ${{ matrix.host }}
-        run: ssh root@${HOST} 'docker exec chatmail cmdeploy dns -v --ssh-host @local'
-
-      # --- Cleanup ---
-
-      - name: add SSH keys
-        if: >-
-          !cancelled() && matrix.add_ssh_keys
-          && steps.wait-for-vps.outcome == 'success'
-        run: ssh root@${{ matrix.host }} 'curl -s https://github.com/hpk42.keys https://github.com/j4n.keys >> .ssh/authorized_keys'

.github/workflows/docker-dispatch.yaml

@@ -0,0 +1,38 @@
+# Notify the docker repo to build and test a new image after relay CI passes.
+#
+# Sends a repository_dispatch event to chatmail/docker with the relay ref
+# and short SHA, which triggers docker-ci.yaml to build, push to GHCR,
+# and run integration tests via cmlxc.
+
+name: Trigger Docker build
+
+on:
+  push:
+    branches: [main]
+    tags: ['[0-9]+.[0-9]+.[0-9]+']
+  workflow_dispatch:
+
+permissions: {}
+
+jobs:
+  dispatch:
+    name: Dispatch build to chatmail/docker
+    runs-on: ubuntu-latest
+    if: github.repository == 'chatmail/relay'
+    steps:
+      - name: Compute short SHA
+        id: sha
+        run: echo "short=$(echo '${{ github.sha }}' | cut -c1-7)" >> "$GITHUB_OUTPUT"
+
+      - name: Send repository_dispatch
+        uses: peter-evans/repository-dispatch@ff45666b9427631e3450c54a1bcbee4d9ff4d7c0 # v3
+        with:
+          token: ${{ secrets.CHATMAIL_DOCKER_DISPATCH_TOKEN }}
+          repository: chatmail/docker
+          event-type: relay-updated
+          client-payload: >-
+            {
+              "relay_ref": "${{ github.ref_name }}",
+              "relay_sha": "${{ github.sha }}",
+              "relay_sha_short": "${{ steps.sha.outputs.short }}"
+            }

.github/workflows/docs-preview.yaml

@@ -7,6 +7,8 @@ on:
       - 'scripts/build-docs.sh'
       - '.github/workflows/docs-preview.yaml'
 
+permissions: {}
+
 jobs:
   scripts:
     name: build 
@@ -16,6 +18,8 @@ jobs:
       url: https://staging.chatmail.at/doc/relay/${{ steps.prepare.outputs.prid }}
     steps:
       - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
 
       - name: initenv 
         run: scripts/initenv.sh
@@ -34,18 +38,22 @@ jobs:
       - name: Get Pullrequest ID
         id: prepare
         run: |
-          export PULLREQUEST_ID=$(echo "${{ github.ref }}" | cut -d "/" -f3)
+          export PULLREQUEST_ID=$(echo "${GITHUB_REF}" | cut -d "/" -f3)
           echo "prid=$PULLREQUEST_ID" >> $GITHUB_OUTPUT
           if [ $(expr length "${{ secrets.USERNAME }}") -gt "1" ]; then echo "uploadtoserver=true" >> $GITHUB_OUTPUT; fi
       - run: |
-          echo "baseurl: /${{ steps.prepare.outputs.prid }}" >> _config.yml
+          echo "baseurl: /${STEPS_PREPARE_OUTPUTS_PRID}" >> _config.yml
+        env:
+          STEPS_PREPARE_OUTPUTS_PRID: ${{ steps.prepare.outputs.prid }}
 
       - name: Upload preview
         run: |
           mkdir -p "$HOME/.ssh"
           echo "${{ secrets.CHATMAIL_STAGING_SSHKEY }}" > "$HOME/.ssh/key"
           chmod 600 "$HOME/.ssh/key"
-          rsync -rILvh -e "ssh -i $HOME/.ssh/key -o StrictHostKeyChecking=no" $GITHUB_WORKSPACE/doc/build/ "${{ secrets.USERNAME }}@chatmail.at:/var/www/html/staging.chatmail.at/doc/relay/${{ steps.prepare.outputs.prid }}/"
+          rsync -rILvh -e "ssh -i $HOME/.ssh/key -o StrictHostKeyChecking=no" $GITHUB_WORKSPACE/doc/build/ "${{ secrets.USERNAME }}@chatmail.at:/var/www/html/staging.chatmail.at/doc/relay/${STEPS_PREPARE_OUTPUTS_PRID}/"
+        env:
+          STEPS_PREPARE_OUTPUTS_PRID: ${{ steps.prepare.outputs.prid }}
 
       - name: check links 
         working-directory: doc

.github/workflows/docs.yaml

@@ -10,6 +10,8 @@ on:
       - 'scripts/build-docs.sh'
       - '.github/workflows/docs.yaml'
 
+permissions: {}
+
 jobs:
   scripts:
     name: build 
@@ -19,6 +21,8 @@ jobs:
       url: https://chatmail.at/doc/relay/
     steps:
       - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
 
       - name: initenv 
         run: scripts/initenv.sh

.github/workflows/filtermail-ci.yml

@@ -0,0 +1,79 @@
+name: filtermail CI
+
+permissions: {}
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+    paths:
+      - "filtermail/**"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  fmt:
+    name: Check Formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - uses: dtolnay/rust-toolchain@2c7215f132e9ebf062739d9130488b56d53c060c # master
+        with:
+          toolchain: nightly
+          components: rustfmt
+      - uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4 # v2.9.1
+      - uses: taiki-e/install-action@2ca9b94c269419b7b0c711c09d0b21c4e1d51145 # v2.83.1
+        with:
+          tool: taplo-cli
+      - run: cd filtermail && taplo format --check && cargo fmt --check
+
+  cargo-machete:
+    name: Check Unused Dependencies
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - uses: bnjbvr/cargo-machete@ac30a525c0a8d163a92d727b3ff079ee3f6ecb08 # v0.9.2
+
+  lint-clippy:
+    name: Check Clippy
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        toolchain: ["stable", "beta"]
+    continue-on-error: ${{ matrix.toolchain == 'beta' }}
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - uses: dtolnay/rust-toolchain@2c7215f132e9ebf062739d9130488b56d53c060c # master
+        with:
+          toolchain: ${{ matrix.toolchain }}
+          components: clippy
+      - uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4 # v2.9.1
+      - run: cd filtermail && cargo clippy
+        env:
+          RUSTUP_TOOLCHAIN: ${{ matrix.toolchain }}
+
+  rust-test:
+    name: Run rust tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - uses: dtolnay/rust-toolchain@2c7215f132e9ebf062739d9130488b56d53c060c # master
+        with:
+          toolchain: stable
+      - uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4 # v2.9.1
+      - run: cd filtermail && cargo test

.github/workflows/filtermail-release.yml

@@ -0,0 +1,75 @@
+on:
+  push:
+    tags:
+      - 'filtermail-*'
+
+permissions: {}
+
+jobs:
+  build:
+    name: Build binaries.
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - uses: dtolnay/rust-toolchain@2c7215f132e9ebf062739d9130488b56d53c060c # master
+        with:
+          toolchain: stable
+          targets: aarch64-unknown-linux-musl,x86_64-unknown-linux-musl
+      - uses: mlugg/setup-zig@d1434d08867e3ee9daa34448df10607b98908d29 # v2.2.1
+        with:
+          use-cache: false
+      - uses: taiki-e/install-action@2ca9b94c269419b7b0c711c09d0b21c4e1d51145 # v2.83.1
+        with:
+          tool: cargo-zigbuild
+      - name: Build
+        run: |
+          cd filtermail
+          RUSTFLAGS="-Ctarget-feature=+crt-static -Clink-self-contained=yes" \
+          cargo zigbuild \
+            --release \
+            --target x86_64-unknown-linux-musl \
+            --target aarch64-unknown-linux-musl
+      - name: Upload x86_64 binary
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: filtermail-x86_64
+          path: filtermail/target/x86_64-unknown-linux-musl/release/filtermail
+          if-no-files-found: error
+      - name: Upload aarch64 binary
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: filtermail-aarch64
+          path: filtermail/target/aarch64-unknown-linux-musl/release/filtermail
+          if-no-files-found: error
+
+  publish:
+    name: Upload binaries to the release
+    needs: ["build"]
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download x86_64 binary
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          name: filtermail-x86_64
+          path: filtermail-x86_64
+      - name: Download aarch64 binary
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          name: filtermail-aarch64
+          path: filtermail-aarch64
+      - name: Upload binaries to the GitHub release
+        if: github.event_name == 'release'
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          REF_NAME: ${{ github.ref_name }}
+        run: |
+          mkdir dist
+          mv filtermail-x86_64/filtermail dist/filtermail-x86_64
+          mv filtermail-aarch64/filtermail dist/filtermail-aarch64
+          gh release upload "$REF_NAME" \
+            --repo ${{ github.repository }} \
+            dist/*

.github/workflows/zizmor-scan.yml

@@ -0,0 +1,26 @@
+name: GitHub Actions Security Analysis with zizmor
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["**"]
+
+permissions: {}
+
+jobs:
+  zizmor:
+    name: Run zizmor
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write # Required for upload-sarif (used by zizmor-action) to upload SARIF files.
+      contents: read
+      actions: read
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+
+      - name: Run zizmor
+        uses: zizmorcore/zizmor-action@b1d7e1fb5de872772f31590499237e7cce841e8e # v0.5.3

.github/zizmor.yml

@@ -0,0 +1,7 @@
+rules:
+  unpinned-uses:
+    config:
+      policies:
+        actions/*: ref-pin
+        dependabot/*: ref-pin
+        chatmail/*: ref-pin

.gitignore

@@ -78,6 +78,7 @@ docs/_build/
 # PyBuilder
 .pybuilder/
 target/
+filtermail/target/
 
 # Jupyter Notebook
 .ipynb_checkpoints
@@ -164,9 +165,3 @@ cython_debug/
 #.idea/
 
 chatmail.zone
-
-# docker
-/data/
-/custom/
-docker-compose.override.yaml
-.env

CHANGELOG.md

@@ -1,4 +1,130 @@
-# Changelog for chatmail deployment 
+# Changelog for chatmail deployment
+
+## [1.11.0] - 2026-05-15
+
+### Breaking Changes
+
+- [**breaking**] Drop passthrough_sender and passthrough_recipients chatmail.ini options to eliminate one more source of unencrypted messages
+
+### Features
+
+- Use filtermail for delivery to remote MTAs
+- Expose metadata "maxsmtprecipients" value
+- Support setup without domain, with only an IPv4 address (#963)
+- *(doc/docker)* Introduce docker images in documentation
+- DKIM-sign bounce messages (mainly "user does not exist")
+- *(config)* Load default values from Config(), not chatmail.ini.f (#853)
+- Make turn_socket_path configurable, and cleanup tests and turnserver code.
+- Warn about any unused chatmail.ini parameter at the end of "cmdeploy run"
+
+### Bug Fixes
+
+- Make www tests work with editable instead of just plain installs
+- Use path with no leading slash for mxdeliv
+- Increase filtermail-transport concurrency limit
+- Fix #972 by increasing file descriptors for filtermail
+- *(mtail)* Correct boot ordering and deploy restart logic
+- *(cmdeploy)* Stop and disable unbound-resolvconf
+- *(nginx)* Properly redirect www to mail_domain
+- *(dns)* Query correct NS if MNAME server is hidden (#954)
+- Legacy token metadata storage used list type, but if no new setmetadata happened, the user would not be notified at all.
+- *(logging)* Log all http requests to syslog
+
+### Documentation
+
+- Document how to upgrade to new version (#965)
+
+### Other
+
+- *(deps)* Upgrade to filtermail v0.6.4
+
+### Refactor
+
+- Introduce automated change-tracking across deployers
+
+## 1.10.0 2026-04-30
+
+* start mtail after networking is fully up <https://github.com/chatmail/relay/pull/942>
+* support specifying custom filtermail binary through environment variable <https://github.com/chatmail/relay/pull/941>
+* add automated zizmor scanning of github workflows <https://github.com/chatmail/relay/pull/938>
+* added dispatch for *automated builds of chatmail relay docker images* <https://github.com/chatmail/relay/pull/934>
+* do not bind SMTP client sockets to public addresses <https://github.com/chatmail/relay/pull/932>
+* underline in docs that scripts/initenv.sh should be used for building the docs <https://github.com/chatmail/relay/pull/933>
+* automatic oldest-first message removal from mailboxes to always stay under max_mailbox_size <https://github.com/chatmail/relay/pull/929>
+* remove --slow from cmdeploy test <https://github.com/chatmail/relay/pull/931>
+* handle missing inotify sysctl keys in containers <https://github.com/chatmail/relay/pull/930>
+* replace resolvconf with static resolv.conf <https://github.com/chatmail/relay/pull/928>
+* disable fsync for LMTP and IMAP services <https://github.com/chatmail/relay/pull/925>
+* re-use cmlxc workflow, replacing CI with hetzner staging servers with local lxc containers <https://github.com/chatmail/relay/pull/917>
+* explicitly install resolvconf <https://github.com/chatmail/relay/pull/924>
+* detect stale dovecot binary and force restart in activate() <https://github.com/chatmail/relay/pull/922>
+* Rename filtermail_http_port to filtermail_http_port_incoming <https://github.com/chatmail/relay/pull/921>
+* consolidated is_in_container() check https://github.com/chatmail/relay/pull/920>
+* restart dovecot after package replacement (rebase, test condense) <https://github.com/chatmail/relay/pull/913>
+* Set permissions on dovecot pin prefs <https://github.com/chatmail/relay/pull/915>
+* Route `/mxdeliv/` to configurable port <https://github.com/chatmail/relay/pull/901>
+* fix VM detection, automated testing fixes, use newer chatmail-turn and move to standard BIND DNS zone format <https://github.com/chatmail/relay/pull/912>
+* Upgrade to filtermail 0.6.1 <https://github.com/chatmail/relay/pull/910>
+* pin dovecot packages to prevent apt upgrades <https://github.com/chatmail/relay/pull/908>
+* add rpc server to cmdeploy along with client <https://github.com/chatmail/relay/pull/906>
+* remove unused deps from chatmaild <https://github.com/chatmail/relay/pull/905>
+* set default smtp_tls_security_level to "verify" unconditionally <https://github.com/chatmail/relay/pull/902>
+* featprefer IPv4 in SMTP client <https://github.com/chatmail/relay/pull/900>
+* Install dovecot .deb packages atomically <https://github.com/chatmail/relay/pull/899>
+* stop installing cron package <https://github.com/chatmail/relay/pull/898>
+* Rewrite dovecot install logic, update <https://github.com/chatmail/relay/pull/862>
+* fix a test and some linting fixes <https://github.com/chatmail/relay/pull/897>
+* Disable IP verification on domain-literal addresses <https://github.com/chatmail/relay/pull/895>
+* disable installing recommended packages globally on the relay <https://github.com/chatmail/relay/pull/887>
+* multiple bug fixes across chatmaild and cmdeploy <https://github.com/chatmail/relay/pull/883>
+* remove /metrics from the website <https://github.com/chatmail/relay/pull/703>
+* add Prometheus textfile output to fsreport <https://github.com/chatmail/relay/pull/881>
+* chown opendkim: private key <https://github.com/chatmail/relay/pull/879>
+* make sure chatmail-metadata was started <https://github.com/chatmail/relay/pull/882>
+* dovecot update url <https://github.com/chatmail/relay/pull/880>
+* upgrade to filtermail v0.5.2 <https://github.com/chatmail/relay/pull/876>
+* download dovecot packages from github release <https://github.com/chatmail/relay/pull/875>
+* replace DKIM verification with filtermail v0.5 <https://github.com/chatmail/relay/pull/831>
+* remove CFFI deltachat bindings usage, and consolidate test support with rpc-bindings <https://github.com/chatmail/relay/pull/872>
+* prepare chatmaild/cmdeploy changes for Docker support <https://github.com/chatmail/relay/pull/857>
+* stabilize online benchmark timing adding rate-limit-aware cooldown between iterations <https://github.com/chatmail/relay/pull/867>
+* move rate-limit cooldown to benchmark fixture <https://github.com/chatmail/relay/pull/868>
+* reconfigure acmetool from redirector to proxy mode <https://github.com/chatmail/relay/pull/861>
+* make tests work with `--ssh-host localhost` <https://github.com/chatmail/relay/pull/856>
+* mark f-string with f prefix in test_expunged <https://github.com/chatmail/relay/pull/863>
+* install also if dovecot.service=False in SystemdEnabled Fact <https://github.com/chatmail/relay/pull/841>
+* Introduce support for self-signed chatmail relays <https://github.com/chatmail/relay/pull/855>
+* Strip Received headers before delivery <https://github.com/chatmail/relay/pull/849>
+* upgrade to filtermail v0.3 <https://github.com/chatmail/relay/pull/850>
+* fix link to Maddy and update madmail URL <https://github.com/chatmail/relay/pull/847>
+* accept self-signed certificates for IP-only relays <https://github.com/chatmail/relay/pull/846>
+* enforce sending from public IP addresses <https://github.com/chatmail/relay/pull/845>
+* port check: check addresses, fix single services <https://github.com/chatmail/relay/pull/844>
+* remediates issue with improper concat on resolver injection <https://github.com/chatmail/relay/pull/834>
+* ipv6 boolean not being respected during operations <https://github.com/chatmail/relay/pull/832>
+* upgrade to filtermail v0.2 by <https://github.com/chatmail/relay/pull/825>
+* fix link to filtermail <https://github.com/chatmail/relay/pull/824>
+* print timestamps when sending messages <https://github.com/chatmail/relay/pull/823>
+* fix flaky test_exceed_rate_limit <https://github.com/chatmail/relay/pull/822>
+* Replace filtermail with rust reimplementation <https://github.com/chatmail/relay/pull/808>
+* Set default internal SMTP ports in Config <https://github.com/chatmail/relay/pull/819>
+* separate metrics for incoming and outgoing messages <https://github.com/chatmail/relay/pull/820>
+* disable appending the Received header <https://github.com/chatmail/relay/pull/815>
+* fail on errors in postfix/dovecot config <https://github.com/chatmail/relay/pull/813>
+* tweak idle/hibernate metrics some more <https://github.com/chatmail/relay/pull/811>
+* add config flag to export statistics <https://github.com/chatmail/relay/pull/806>
+* add --website-only option to run subcommand <https://github.com/chatmail/relay/pull/768>
+* Strip DKIM-Signature header before LMTP <https://github.com/chatmail/relay/pull/803>
+* properly make sure that postfix gets restarted on failure <https://github.com/chatmail/relay/pull/802>
+* expire.py: use absolute path to maildirsize <https://github.com/chatmail/relay/pull/807>
+* pin Dovecot documentation URLs to version 2.3 <https://github.com/chatmail/relay/pull/800>
+* try to use "build machine" and "deployment server"  consistently  <https://github.com/chatmail/relay/pull/797>
+* adds instructions for migrating control machines <https://github.com/chatmail/relay/pull/795>
+* use consistent naming schema in getting started <https://github.com/chatmail/relay/pull/793>
+* remove jsok/serialize-workflow-action dependency <https://github.com/chatmail/relay/pull/790>
+* streamline migration guide wording, provide titled steps  <https://github.com/chatmail/relay/pull/789>
+* increases default max mailbox size <https://github.com/chatmail/relay/pull/792>
+* use daemon_name for OpenDKIM sign-verify decision instead of IP <https://github.com/chatmail/relay/pull/784>
 
 ## 1.9.0 2025-12-18
 

README.md

@@ -8,7 +8,12 @@ Chatmail relay servers are interoperable Mail Transport Agents (MTAs) designed f
 -  **Instant/Realtime:** sub-second message delivery, realtime P2P
    streaming, privacy-preserving Push Notifications for Apple, Google, and Huawei;
 
--  **Security Enforcement**: only strict TLS, DKIM and OpenPGP with minimized metadata accepted
+-  **Security Enforcement**: Only connections with strict TLS are accepted;
+   all messages must be correctly signed with DKIM and OpenPGP-encrypted with minimized metadata.
+   There are experimental exceptions for no-DNS relays,
+   which are allowed use self-signed TLS certificates
+   and which do not need to DKIM-sign their messages.
+   Unencrypted messages are allowed in neither case.
 
 -  **Reliable Federation and Decentralization:** No spam or IP reputation checks, federating
    depends on established IETF standards and protocols.

chatmaild/pyproject.toml

@@ -6,13 +6,10 @@ build-backend = "setuptools.build_meta"
 name = "chatmaild"
 version = "0.3"
 dependencies = [
-  "aiosmtpd",
   "iniconfig",
-  "deltachat-rpc-server",
-  "deltachat-rpc-client",
   "filelock",
   "requests",
-  "crypt-r >= 3.13.1 ; python_version >= '3.11'",
+  "crypt-r >= 3.13.1 ; python_version >= '3.13'",
 ]
 
 [tool.setuptools]
@@ -24,11 +21,10 @@ where = ['src']
 [project.scripts]
 doveauth = "chatmaild.doveauth:main"
 chatmail-metadata = "chatmaild.metadata:main"
-chatmail-metrics = "chatmaild.metrics:main"
-chatmail-expire = "chatmaild.expire:main"
+chatmail-expire = "chatmaild.expire:daily_expire_main"
+chatmail-quota-expire = "chatmaild.expire:quota_expire_main"
 chatmail-fsreport = "chatmaild.fsreport:main"
 lastlogin = "chatmaild.lastlogin:main"
-turnserver = "chatmaild.turnserver:main"
 
 [project.entry-points.pytest11]
 "chatmaild.testplugin" = "chatmaild.tests.plugin"
@@ -71,6 +67,7 @@ commands =
 deps = pytest 
        pdbpp 
        pytest-localserver
+       aiosmtpd
        execnet
 commands = pytest -v -rsXx {posargs}
 """

chatmaild/src/chatmaild/config.py

@@ -1,4 +1,4 @@
-import os
+import ipaddress
 from pathlib import Path
 
 import iniconfig
@@ -9,63 +9,78 @@ from chatmaild.user import User
 def read_config(inipath):
     assert Path(inipath).exists(), inipath
     cfg = iniconfig.IniConfig(inipath)
-    params = cfg.sections["params"]
-    default_config_content = get_default_config_content(params["mail_domain"])
-    df_params = iniconfig.IniConfig("ini", data=default_config_content)["params"]
-    new_params = dict(df_params.items())
-    new_params.update(params)
-    return Config(inipath, params=new_params)
+    return Config(inipath, params=cfg.sections["params"])
 
 
 class Config:
     def __init__(self, inipath, params):
         self._inipath = inipath
-        self.mail_domain = params["mail_domain"]
-        self.max_user_send_per_minute = int(params.get("max_user_send_per_minute", 60))
-        self.max_user_send_burst_size = int(params.get("max_user_send_burst_size", 10))
-        self.max_mailbox_size = params["max_mailbox_size"]
-        self.max_message_size = int(params.get("max_message_size", "31457280"))
-        self.delete_mails_after = params["delete_mails_after"]
-        self.delete_large_after = params["delete_large_after"]
-        self.delete_inactive_users_after = int(params["delete_inactive_users_after"])
-        self.username_min_length = int(params["username_min_length"])
-        self.username_max_length = int(params["username_max_length"])
-        self.password_min_length = int(params["password_min_length"])
-        self.passthrough_senders = params["passthrough_senders"].split()
-        self.passthrough_recipients = params["passthrough_recipients"].split()
-        self.www_folder = params.get("www_folder", "")
-        self.filtermail_smtp_port = int(params.get("filtermail_smtp_port", "10080"))
+        params = dict(params)
+        raw_domain = params.pop("mail_domain")
+        self.mail_domain_bare = raw_domain
+
+        if is_valid_ipv4(raw_domain):
+            self.ipv4_relay = raw_domain
+            self.mail_domain = f"[{raw_domain}]"
+            self.postfix_myhostname = ipaddress.IPv4Address(raw_domain).reverse_pointer
+        else:
+            self.ipv4_relay = None
+            self.mail_domain = raw_domain
+            self.postfix_myhostname = raw_domain
+
+        self.max_user_send_per_minute = int(params.pop("max_user_send_per_minute", 60))
+        self.max_user_send_burst_size = int(params.pop("max_user_send_burst_size", 10))
+        self.max_mailbox_size = params.pop("max_mailbox_size", "500M")
+        self.max_message_size = int(params.pop("max_message_size", 31457280))
+        self.delete_mails_after = params.pop("delete_mails_after", "20")
+        self.delete_large_after = params.pop("delete_large_after", "7")
+        self.delete_inactive_users_after = int(
+            params.pop("delete_inactive_users_after", 90)
+        )
+        self.username_min_length = int(params.pop("username_min_length", 9))
+        self.username_max_length = int(params.pop("username_max_length", 9))
+        self.password_min_length = int(params.pop("password_min_length", 9))
+        self.www_folder = params.pop("www_folder", "")
+        self.filtermail_smtp_port = int(params.pop("filtermail_smtp_port", "10080"))
         self.filtermail_smtp_port_incoming = int(
-            params.get("filtermail_smtp_port_incoming", "10081")
+            params.pop("filtermail_smtp_port_incoming", "10081")
         )
-        self.postfix_reinject_port = int(params.get("postfix_reinject_port", "10025"))
+        self.filtermail_http_port_incoming = int(
+            params.pop("filtermail_http_port_incoming", "10082")
+        )
+        self.filtermail_lmtp_port_transport = int(
+            params.pop("filtermail_lmtp_port_transport", "10083")
+        )
+        self.postfix_reinject_port = int(params.pop("postfix_reinject_port", "10025"))
         self.postfix_reinject_port_incoming = int(
-            params.get("postfix_reinject_port_incoming", "10026")
+            params.pop("postfix_reinject_port_incoming", "10026")
         )
-        self.mtail_address = params.get("mtail_address")
-        self.disable_ipv6 = params.get("disable_ipv6", "false").lower() == "true"
-        self.addr_v4 = os.environ.get("CHATMAIL_ADDR_V4", "")
-        self.addr_v6 = os.environ.get("CHATMAIL_ADDR_V6", "")
-        self.acme_email = params.get("acme_email", "")
-        self.imap_rawlog = params.get("imap_rawlog", "false").lower() == "true"
-        self.imap_compress = params.get("imap_compress", "false").lower() == "true"
-        if "iroh_relay" not in params:
-            self.iroh_relay = "https://" + params["mail_domain"]
+        self.mtail_address = params.pop("mtail_address", None)
+        self.disable_ipv6 = params.pop("disable_ipv6", "false").lower() == "true"
+        self.acme_email = params.pop("acme_email", "")
+        self.imap_rawlog = params.pop("imap_rawlog", "false").lower() == "true"
+        self.imap_compress = params.pop("imap_compress", "false").lower() == "true"
+        self.turn_socket_path = params.pop(
+            "turn_socket_path", "/run/chatmail-turn/turn.socket"
+        )
+        iroh_relay = params.pop("iroh_relay", None)
+        if iroh_relay is None:
+            self.iroh_relay = "https://" + raw_domain
             self.enable_iroh_relay = True
         else:
-            self.iroh_relay = params["iroh_relay"].strip()
+            self.iroh_relay = iroh_relay.strip()
             self.enable_iroh_relay = False
-        self.privacy_postal = params.get("privacy_postal")
-        self.privacy_mail = params.get("privacy_mail")
-        self.privacy_pdo = params.get("privacy_pdo")
-        self.privacy_supervisor = params.get("privacy_supervisor")
+        self.privacy_postal = params.pop("privacy_postal", None)
+        self.privacy_mail = params.pop("privacy_mail", None)
+        self.privacy_pdo = params.pop("privacy_pdo", None)
+        self.privacy_supervisor = params.pop("privacy_supervisor", None)
 
         # TLS certificate management.
         # If tls_external_cert_and_key is set, use externally managed certs.
         # Otherwise derived from the domain name:
         # - Domains starting with "_" use self-signed certificates
         # - All other domains use ACME.
-        external = params.get("tls_external_cert_and_key", "").strip()
+        external = params.pop("tls_external_cert_and_key", "").strip()
 
         if external:
             parts = external.split()
@@ -76,21 +91,27 @@ class Config:
                 )
             self.tls_cert_mode = "external"
             self.tls_cert_path, self.tls_key_path = parts
-        elif self.mail_domain.startswith("_"):
+        elif raw_domain.startswith("_") or self.ipv4_relay:
             self.tls_cert_mode = "self"
             self.tls_cert_path = "/etc/ssl/certs/mailserver.pem"
             self.tls_key_path = "/etc/ssl/private/mailserver.key"
         else:
             self.tls_cert_mode = "acme"
-            self.tls_cert_path = f"/var/lib/acme/live/{self.mail_domain}/fullchain"
-            self.tls_key_path = f"/var/lib/acme/live/{self.mail_domain}/privkey"
+            self.tls_cert_path = f"/var/lib/acme/live/{raw_domain}/fullchain"
+            self.tls_key_path = f"/var/lib/acme/live/{raw_domain}/privkey"
 
         # deprecated option
-        mbdir = params.get("mailboxes_dir", f"/home/vmail/mail/{self.mail_domain}")
+        mbdir = params.pop("mailboxes_dir", f"/home/vmail/mail/{raw_domain}")
         self.mailboxes_dir = Path(mbdir.strip())
 
         # old unused option (except for first migration from sqlite to maildir store)
-        self.passdb_path = Path(params.get("passdb_path", "/home/vmail/passdb.sqlite"))
+        self.passdb_path = Path(params.pop("passdb_path", "/home/vmail/passdb.sqlite"))
+        self._unused_keys = list(params)
+
+    @property
+    def max_mailbox_size_mb(self):
+        """Return max_mailbox_size as an integer in megabytes."""
+        return parse_size_mb(self.max_mailbox_size)
 
     def _getbytefile(self):
         return open(self._inipath, "rb")
@@ -105,6 +126,16 @@ class Config:
         return User(maildir, addr, password_path, uid="vmail", gid="vmail")
 
 
+def parse_size_mb(limit):
+    """Parse a size string like ``500M`` or ``2G`` and return megabytes."""
+    value = limit.strip().upper().removesuffix("B")
+    if value.endswith("G"):
+        return int(value[:-1]) * 1024
+    if value.endswith("M"):
+        return int(value[:-1])
+    return int(value)
+
+
 def write_initial_config(inipath, mail_domain, overrides):
     """Write out default config file, using the specified config value overrides."""
     content = get_default_config_content(mail_domain, **overrides)
@@ -132,28 +163,13 @@ def get_default_config_content(mail_domain, **overrides):
     for name, value in extra.items():
         new_line = f"{name} = {value}"
         new_lines.append(new_line)
+    return "\n".join(new_lines)
 
-    content = "\n".join(new_lines)
 
-    # apply testrun privacy overrides
-
-    if mail_domain.endswith(".testrun.org"):
-        override_inipath = inidir.joinpath("override-testrun.ini")
-        privacy = iniconfig.IniConfig(override_inipath)["privacy"]
-        lines = []
-        for line in content.split("\n"):
-            for key, value in privacy.items():
-                value_lines = value.format(mail_domain=mail_domain).strip().split("\n")
-                if not line.startswith(f"{key} =") or not value_lines:
-                    continue
-                if len(value_lines) == 1:
-                    lines.append(f"{key} = {value}")
-                else:
-                    lines.append(f"{key} =")
-                    for vl in value_lines:
-                        lines.append(f"    {vl}")
-                break
-            else:
-                lines.append(line)
-        content = "\n".join(lines)
-    return content
+def is_valid_ipv4(address: str) -> bool:
+    """Check if a mail_domain is an IPv4 address."""
+    try:
+        ipaddress.IPv4Address(address)
+        return True
+    except ValueError:
+        return False

chatmaild/src/chatmaild/doveauth.py

@@ -1,8 +1,11 @@
 import json
 import logging
 import os
+import re
 import sys
 
+import filelock
+
 try:
     import crypt_r
 except ImportError:
@@ -13,6 +16,7 @@ from .dictproxy import DictProxy
 from .migrate_db import migrate_from_db_to_maildir
 
 NOCREATE_FILE = "/etc/chatmail-nocreate"
+VALID_LOCALPART_RE = re.compile(r"^[a-z0-9._-]+$")
 
 
 def encrypt_password(password: str):
@@ -52,6 +56,10 @@ def is_allowed_to_create(config: Config, user, cleartext_password) -> bool:
         )
         return False
 
+    if not VALID_LOCALPART_RE.match(localpart):
+        logging.warning("localpart %r contains invalid characters", localpart)
+        return False
+
     return True
 
 
@@ -140,8 +148,13 @@ class AuthDictProxy(DictProxy):
         if not is_allowed_to_create(self.config, addr, cleartext_password):
             return
 
-        user.set_password(encrypt_password(cleartext_password))
-        print(f"Created address: {addr}", file=sys.stderr)
+        lock = filelock.FileLock(str(user.password_path) + ".lock", timeout=5)
+        with lock:
+            userdata = user.get_userdb_dict()
+            if userdata:
+                return userdata
+            user.set_password(encrypt_password(cleartext_password))
+            print(f"Created address: {addr}", file=sys.stderr)
         return user.get_userdb_dict()
 
 

chatmaild/src/chatmaild/expire.py

@@ -4,17 +4,26 @@ Expire old messages and addresses.
 """
 
 import os
+import re
 import shutil
 import sys
 import time
 from argparse import ArgumentParser
 from collections import namedtuple
 from datetime import datetime
+from pathlib import Path
 from stat import S_ISREG
 
 from chatmaild.config import read_config
 
 FileEntry = namedtuple("FileEntry", ("path", "mtime", "size"))
+QuotaFileEntry = namedtuple("QuotaFileEntry", ("mtime", "quota_size", "path"))
+
+# Quota cleanup factor of max_mailbox_size. The mailbox is reset to this size.
+QUOTA_CLEANUP_FACTOR = 0.7
+
+# e.g. "cur/1775324677.M448978P3029757.exam,S=3235,W=3305:2,S"
+_dovecot_fn_rex = re.compile(r".+/(\d+)\..+,S=(\d+)")
 
 
 def iter_mailboxes(basedir, maxnum):
@@ -74,6 +83,42 @@ class MailboxStat:
         self.extrafiles.sort(key=lambda x: -x.size)
 
 
+def parse_dovecot_filename(relpath):
+    m = _dovecot_fn_rex.match(relpath)
+    if not m:
+        return None
+    return QuotaFileEntry(int(m.group(1)), int(m.group(2)), relpath)
+
+
+def scan_mailbox_messages(mbox):
+    messages = []
+    for sub in ("cur", "new"):
+        for name in os_listdir_if_exists(mbox / sub):
+            if entry := parse_dovecot_filename(f"{sub}/{name}"):
+                messages.append(entry)
+    return messages
+
+
+def expire_to_target(mbox, target_bytes):
+    messages = scan_mailbox_messages(mbox)
+    total_size = sum(m.quota_size for m in messages)
+    # Keep recent 24 hours of messages protected from expiry because
+    # likely something is wrong with interactions on that address
+    # and quota-full signal can help the address owner's device to notice it
+    undeletable_messages_cutoff = time.time() - (3600 * 24)
+    removed = 0
+    for entry in sorted(messages):
+        if total_size <= target_bytes:
+            break
+        if entry.mtime > undeletable_messages_cutoff:
+            break
+        (mbox / entry.path).unlink(missing_ok=True)
+        total_size -= entry.quota_size
+        removed += 1
+
+    return removed
+
+
 def print_info(msg):
     print(msg, file=sys.stderr)
 
@@ -123,6 +168,16 @@ class Expiry:
         if mbox.last_login and mbox.last_login < cutoff_without_login:
             self.remove_mailbox(mbox.basedir)
             return
+        elif mbox.last_login is None:
+            try:
+                if not self.dry:
+                    os.rmdir(mbox.basedir)
+                    self.del_mboxes += 1
+            except OSError:
+                print_info(
+                    f"Skipped deleting {mbox.basedir}, doesn't have last_login but isn't empty"
+                )
+            return
 
         mboxname = os.path.basename(mbox.basedir)
         if self.verbose:
@@ -143,6 +198,19 @@ class Expiry:
             else:
                 continue
             changed = True
+
+        target_bytes = (
+            self.config.max_mailbox_size_mb * 1024 * 1024 * QUOTA_CLEANUP_FACTOR
+        )
+        removed = expire_to_target(Path(mbox.basedir), target_bytes)
+        if removed:
+            changed = True
+            self.del_files += removed
+            if self.verbose:
+                print_info(
+                    f"quota-expire: removed {removed} message(s) from {mboxname}"
+                )
+
         if changed:
             self.remove_file(f"{mbox.basedir}/maildirsize")
 
@@ -154,9 +222,9 @@ class Expiry:
         )
 
 
-def main(args=None):
+def daily_expire_main(args=None):
     """Expire mailboxes and messages according to chatmail config"""
-    parser = ArgumentParser(description=main.__doc__)
+    parser = ArgumentParser(description=daily_expire_main.__doc__)
     ini = "/usr/local/lib/chatmaild/chatmail.ini"
     parser.add_argument(
         "chatmail_ini",
@@ -202,5 +270,33 @@ def main(args=None):
     print(exp.get_summary())
 
 
-if __name__ == "__main__":
-    main(sys.argv[1:])
+def quota_expire_main(args=None):
+    """Remove mailbox messages to stay within a megabyte target.
+
+    This entry point is called by dovecot when a quota threshold is passed.
+    """
+
+    parser = ArgumentParser(description=quota_expire_main.__doc__)
+    parser.add_argument(
+        "target_mb",
+        type=int,
+        help="target mailbox size in megabytes",
+    )
+    parser.add_argument(
+        "mailbox_path",
+        type=Path,
+        help="path to a user mailbox",
+    )
+    args = parser.parse_args(args)
+
+    target_bytes = args.target_mb * 1024 * 1024
+
+    removed_count = expire_to_target(args.mailbox_path, target_bytes)
+    if removed_count:
+        (args.mailbox_path / "maildirsize").unlink(missing_ok=True)
+        print(
+            f"quota-expire: removed {removed_count} message(s)"
+            f" from {args.mailbox_path.name}",
+            file=sys.stderr,
+        )
+    return 0

chatmaild/src/chatmaild/ini/chatmail.ini.f

@@ -12,41 +12,35 @@ mail_domain = {mail_domain}
 #
 
 # email sending rate per user and minute
-max_user_send_per_minute = 60
+#max_user_send_per_minute = 60
 
 # per-user max burst size for sending rate limiting (GCRA bucket capacity)
-max_user_send_burst_size = 10
+#max_user_send_burst_size = 10
 
 # maximum mailbox size of a chatmail address
-max_mailbox_size = 500M
+# (Oldest messages will be removed automatically, so mailboxes never run full)
+#max_mailbox_size = 500M
 
 # maximum message size for an e-mail in bytes
-max_message_size = 31457280
+#max_message_size = 31457280
 
 # days after which mails are unconditionally deleted
-delete_mails_after = 20
+#delete_mails_after = 20
 
 # days after which large messages (>200k) are unconditionally deleted
-delete_large_after = 7
+#delete_large_after = 7
 
 # days after which users without a successful login are deleted (database and mails)
-delete_inactive_users_after = 90
+#delete_inactive_users_after = 90
 
 # minimum length a username must have
-username_min_length = 9
+#username_min_length = 9
 
 # maximum length a username can have
-username_max_length = 9
+#username_max_length = 9
 
 # minimum length a password must have
-password_min_length = 9
-
-# list of chatmail addresses which can send outbound un-encrypted mail
-passthrough_senders =
-
-# list of e-mail recipients for which to accept outbound un-encrypted mails
-# (space-separated, item may start with "@" to whitelist whole recipient domains)
-passthrough_recipients =
+#password_min_length = 9
 
 # Use externally managed TLS certificates instead of built-in acmetool.
 # Paths refer to files on the deployment server (not the build machine).
@@ -62,19 +56,11 @@ passthrough_recipients =
 # Deployment Details
 #
 
-# SMTP outgoing filtermail and reinjection 
-filtermail_smtp_port = 10080
-postfix_reinject_port = 10025
-
-# SMTP incoming filtermail and reinjection 
-filtermail_smtp_port_incoming = 10081
-postfix_reinject_port_incoming = 10026
-
 # if set to "True" IPv6 is disabled
-disable_ipv6 = False
+#disable_ipv6 = False
 
 # Your email adress, which will be used in acmetool to manage Let's Encrypt SSL certificates
-acme_email = 
+#acme_email =
 
 # Defaults to https://iroh.{{mail_domain}} and running `iroh-relay` on the chatmail
 # service.
@@ -107,13 +93,13 @@ acme_email =
 # in per-maildir ".in/.out" files. 
 # Note that you need to manually cleanup these files
 # so use this option with caution on production servers. 
-imap_rawlog = false 
+#imap_rawlog = false
 
 # set to true if you want to enable the IMAP COMPRESS Extension,
 # which allows IMAP connections to be efficiently compressed.
 # WARNING: Enabling this makes it impossible to hibernate IMAP
 # processes which will result in much higher memory/RAM usage.
-imap_compress = false
+#imap_compress = false
 
 
 #

chatmaild/src/chatmaild/ini/override-testrun.ini

@@ -1,16 +0,0 @@
-
-[privacy]
-
-passthrough_recipients = privacy@testrun.org echo@{mail_domain}
-
-privacy_postal =
-    Merlinux GmbH, Represented by the managing director H. Krekel,
-    Reichgrafen Str. 20, 79102 Freiburg, Germany
-
-privacy_mail = privacy@testrun.org
-privacy_pdo =
-    Prof. Dr. Fabian Schmieder, lexICT UG (limited), Ostfeldstr. 49, 30559 Hannover.
-    You can contact him at *delta-privacy@merlinux.eu* (Keyword: DPO)
-privacy_supervisor =
-    State Commissioner for Data Protection and Freedom of Information of
-    Baden-Württemberg in 70173 Stuttgart, Germany.

chatmaild/src/chatmaild/metadata.py

@@ -1,4 +1,5 @@
 import logging
+import socket
 import sys
 import time
 from contextlib import contextmanager
@@ -7,7 +8,14 @@ from .config import read_config
 from .dictproxy import DictProxy
 from .filedict import FileDict
 from .notifier import Notifier
-from .turnserver import turn_credentials
+
+
+def turn_credentials(turn_socket_path):
+    with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as client_socket:
+        client_socket.settimeout(5)
+        client_socket.connect(turn_socket_path)
+        with client_socket.makefile("rb") as file:
+            return file.readline().decode("utf-8").strip()
 
 
 def _is_valid_token_timestamp(timestamp, now):
@@ -70,40 +78,53 @@ class Metadata:
                 # Some tokens have expired, remove them.
                 with self._modify_tokens(addr) as _tokens:
                     pass
+        elif isinstance(tokens, list):
+            with self._modify_tokens(addr) as tokens:
+                token_list = list(tokens.keys())
         else:
             token_list = []
         return token_list
 
 
 class MetadataDictProxy(DictProxy):
-    def __init__(self, notifier, metadata, iroh_relay=None, turn_hostname=None):
+    def __init__(
+        self,
+        notifier,
+        metadata,
+        iroh_relay=None,
+        turn_hostname=None,
+        turn_socket_path=None,
+    ):
         super().__init__()
         self.notifier = notifier
         self.metadata = metadata
         self.iroh_relay = iroh_relay
         self.turn_hostname = turn_hostname
+        self.turn_socket_path = turn_socket_path
 
     def handle_lookup(self, parts):
         # Lpriv/43f5f508a7ea0366dff30200c15250e3/devicetoken\tlkj123poi@c2.testrun.org
-        keyparts = parts[0].split("/", 2)
-        if keyparts[0] == "priv":
-            keyname = keyparts[2]
-            addr = parts[1]
-            if keyname == self.metadata.DEVICETOKEN_KEY:
+        match parts[0].split("/", 2):
+            case ["priv", _, keyname] if keyname == self.metadata.DEVICETOKEN_KEY:
+                addr = parts[1]
                 res = " ".join(self.metadata.get_tokens_for_addr(addr))
                 return f"O{res}\n"
-        elif keyparts[0] == "shared":
-            keyname = keyparts[2]
-            if (
-                keyname == "vendor/vendor.dovecot/pvt/server/vendor/deltachat/irohrelay"
-                and self.iroh_relay
-            ):
-                # Handle `GETMETADATA "" /shared/vendor/deltachat/irohrelay`
-                return f"O{self.iroh_relay}\n"
-            elif keyname == "vendor/vendor.dovecot/pvt/server/vendor/deltachat/turn":
-                res = turn_credentials()
-                port = 3478
-                return f"O{self.turn_hostname}:{port}:{res}\n"
+            case ["shared", _, keyname]:
+                prefix = "vendor/vendor.dovecot/pvt/server/vendor/deltachat/"
+                if keyname.startswith(prefix):
+                    match keyname[len(prefix) :]:
+                        case "irohrelay" if self.iroh_relay:
+                            return f"O{self.iroh_relay}\n"
+                        case "turn":
+                            try:
+                                res = turn_credentials(self.turn_socket_path)
+                            except Exception:
+                                logging.exception("failed to get TURN credentials")
+                                return "N\n"
+                            return f"O{self.turn_hostname}:3478:{res}\n"
+                        case "maxsmtprecipients":
+                            # postfix default  (see "postconf smtpd_recipient_limit")
+                            return "O1000\n"
 
         logging.warning(f"lookup ignored: {parts!r}")
         return "N\n"
@@ -113,12 +134,13 @@ class MetadataDictProxy(DictProxy):
         # https://github.com/dovecot/core/blob/main/src/lib-storage/mailbox-attribute.h
         keyname = parts[1].split("/")
         value = parts[2] if len(parts) > 2 else ""
-        if keyname[0] == "priv" and keyname[2] == self.metadata.DEVICETOKEN_KEY:
-            self.metadata.add_token_to_addr(addr, value)
-            return True
-        elif keyname[0] == "priv" and keyname[2] == "messagenew":
-            self.notifier.new_message_for_addr(addr, self.metadata)
-            return True
+        match keyname:
+            case ["priv", _, key] if key == self.metadata.DEVICETOKEN_KEY:
+                self.metadata.add_token_to_addr(addr, value)
+                return True
+            case ["priv", _, "messagenew"]:
+                self.notifier.new_message_for_addr(addr, self.metadata)
+                return True
 
         return False
 
@@ -129,6 +151,7 @@ def main():
     config = read_config(config_path)
     iroh_relay = config.iroh_relay
     mail_domain = config.mail_domain
+    socket_path = config.turn_socket_path
 
     vmail_dir = config.mailboxes_dir
     if not vmail_dir.exists():
@@ -146,6 +169,7 @@ def main():
         metadata=metadata,
         iroh_relay=iroh_relay,
         turn_hostname=mail_domain,
+        turn_socket_path=socket_path,
     )
 
     dictproxy.serve_forever_from_socket(socket)

chatmaild/src/chatmaild/metrics.py

@@ -1,32 +0,0 @@
-#!/usr/bin/env python3
-import sys
-from pathlib import Path
-
-
-def main(vmail_dir=None):
-    if vmail_dir is None:
-        vmail_dir = sys.argv[1]
-
-    accounts = 0
-    ci_accounts = 0
-
-    for path in Path(vmail_dir).iterdir():
-        if not path.joinpath("cur").is_dir():
-            continue
-        accounts += 1
-        if path.name[:3] in ("ci-", "ac_"):
-            ci_accounts += 1
-
-    print("# HELP total number of accounts")
-    print("# TYPE accounts gauge")
-    print(f"accounts {accounts}")
-    print("# HELP number of CI accounts")
-    print("# TYPE ci_accounts gauge")
-    print(f"ci_accounts {ci_accounts}")
-    print("# HELP number of non-CI accounts")
-    print("# TYPE nonci_accounts gauge")
-    print(f"nonci_accounts {accounts - ci_accounts}")
-
-
-if __name__ == "__main__":
-    main()

chatmaild/src/chatmaild/newemail.py

@@ -3,7 +3,6 @@
 """CGI script for creating new accounts."""
 
 import json
-import random
 import secrets
 import string
 from urllib.parse import quote
@@ -16,7 +15,9 @@ ALPHANUMERIC_PUNCT = string.ascii_letters + string.digits + string.punctuation
 
 
 def create_newemail_dict(config: Config):
-    user = "".join(random.choices(ALPHANUMERIC, k=config.username_max_length))
+    user = "".join(
+        secrets.choice(ALPHANUMERIC) for _ in range(config.username_max_length)
+    )
     password = "".join(
         secrets.choice(ALPHANUMERIC_PUNCT)
         for _ in range(config.password_min_length + 3)
@@ -24,13 +25,19 @@ def create_newemail_dict(config: Config):
     return dict(email=f"{user}@{config.mail_domain}", password=f"{password}")
 
 
-def create_dclogin_url(email, password):
+def create_dclogin_url(config, email, password):
     """Build a dclogin: URL with credentials and self-signed cert acceptance.
 
     Uses ic=3 (AcceptInvalidCertificates) so chatmail clients
     can connect to servers with self-signed TLS certificates.
     """
-    return f"dclogin:{quote(email, safe='@')}?p={quote(password, safe='')}&v=1&ic=3"
+    if config.ipv4_relay:
+        imap_host = "&ih=" + config.ipv4_relay
+        smtp_host = "&sh=" + config.ipv4_relay
+    else:
+        imap_host = ""
+        smtp_host = ""
+    return f"dclogin:{quote(email, safe='@[]')}?p={quote(password, safe='')}&v=1{imap_host}{smtp_host}&ic=3"
 
 
 def print_new_account():
@@ -39,7 +46,9 @@ def print_new_account():
 
     result = dict(email=creds["email"], password=creds["password"])
     if config.tls_cert_mode == "self":
-        result["dclogin_url"] = create_dclogin_url(creds["email"], creds["password"])
+        result["dclogin_url"] = create_dclogin_url(
+            config, creds["email"], creds["password"]
+        )
 
     print("Content-Type: application/json")
     print("")

chatmaild/src/chatmaild/tests/plugin.py

@@ -31,6 +31,11 @@ def example_config(make_config):
     return make_config("chat.example.org")
 
 
+@pytest.fixture
+def ipv4_config(make_config):
+    return make_config("1.3.3.7")
+
+
 @pytest.fixture
 def maildomain(example_config):
     return example_config.mail_domain

chatmaild/src/chatmaild/tests/test_config.py

@@ -1,6 +1,10 @@
 import pytest
 
-from chatmaild.config import read_config
+from chatmaild.config import (
+    is_valid_ipv4,
+    parse_size_mb,
+    read_config,
+)
 
 
 def test_read_config_basic(example_config):
@@ -9,10 +13,21 @@ def test_read_config_basic(example_config):
     assert not example_config.privacy_pdo and not example_config.privacy_postal
 
     inipath = example_config._inipath
-    inipath.write_text(inipath.read_text().replace("60", "37"))
+    inipath.write_text(
+        inipath.read_text().replace(
+            "#max_user_send_per_minute = 60",
+            "max_user_send_per_minute = 37",
+        )
+    )
     example_config = read_config(inipath)
     assert example_config.max_user_send_per_minute == 37
     assert example_config.mail_domain == "chat.example.org"
+    assert example_config.ipv4_relay is None
+
+
+def test_read_config_ipv4(ipv4_config):
+    assert ipv4_config.ipv4_relay == "1.3.3.7"
+    assert ipv4_config.mail_domain == "[1.3.3.7]"
 
 
 def test_read_config_basic_using_defaults(tmp_path, maildomain):
@@ -21,26 +36,21 @@ def test_read_config_basic_using_defaults(tmp_path, maildomain):
     example_config = read_config(inipath)
     assert example_config.max_user_send_per_minute == 60
     assert example_config.filtermail_smtp_port_incoming == 10081
+    assert example_config.filtermail_smtp_port == 10080
+    assert example_config.postfix_reinject_port == 10025
+    assert example_config.max_user_send_per_minute == 60
+    assert example_config.max_mailbox_size == "500M"
+    assert example_config.delete_mails_after == "20"
+    assert example_config.delete_large_after == "7"
+    assert example_config.username_min_length == 9
+    assert example_config.username_max_length == 9
+    assert example_config.password_min_length == 9
+    assert example_config._unused_keys == []
 
 
-def test_read_config_testrun(make_config):
-    config = make_config("something.testrun.org")
-    assert config.mail_domain == "something.testrun.org"
-    assert len(config.privacy_postal.split("\n")) > 1
-    assert len(config.privacy_supervisor.split("\n")) > 1
-    assert len(config.privacy_pdo.split("\n")) > 1
-    assert config.privacy_mail == "privacy@testrun.org"
-    assert config.filtermail_smtp_port == 10080
-    assert config.postfix_reinject_port == 10025
-    assert config.max_user_send_per_minute == 60
-    assert config.max_mailbox_size == "500M"
-    assert config.delete_mails_after == "20"
-    assert config.delete_large_after == "7"
-    assert config.username_min_length == 9
-    assert config.username_max_length == 9
-    assert config.password_min_length == 9
-    assert "privacy@testrun.org" in config.passthrough_recipients
-    assert config.passthrough_senders == []
+def test_config_unused_keys(make_config):
+    config = make_config("chat.example.org", {"passthrough_senders": "x@y.org"})
+    assert config._unused_keys == ["passthrough_senders"]
 
 
 def test_config_userstate_paths(make_config, tmp_path):
@@ -121,3 +131,31 @@ def test_config_tls_external_bad_format(make_config):
                 "tls_external_cert_and_key": "/only/one/path.pem",
             },
         )
+
+
+def test_parse_size_mb():
+    assert parse_size_mb("500M") == 500
+    assert parse_size_mb("2G") == 2048
+    assert parse_size_mb("  1g  ") == 1024
+    assert parse_size_mb("100MB") == 100
+    assert parse_size_mb("256") == 256
+
+
+def test_max_mailbox_size_mb(make_config):
+    config = make_config("chat.example.org")
+    assert config.max_mailbox_size == "500M"
+    assert config.max_mailbox_size_mb == 500
+
+
+@pytest.mark.parametrize(
+    ["input", "result"],
+    [
+        ("example.org", False),
+        ("1.3.3.7", True),
+        ("fe::1", False),
+        ("ad.1e.dag.adf", False),
+        ("12394142", False),
+    ],
+)
+def test_is_valid_ipv4(input, result):
+    assert result == is_valid_ipv4(input)

chatmaild/src/chatmaild/tests/test_delete_inactive_users.py

@@ -1,7 +1,7 @@
 import time
 
 from chatmaild.doveauth import AuthDictProxy
-from chatmaild.expire import main as main_expire
+from chatmaild.expire import daily_expire_main as main_expire
 
 
 def test_login_timestamps(example_config):

chatmaild/src/chatmaild/tests/test_doveauth.py

@@ -120,6 +120,60 @@ def test_handle_dovecot_protocol_iterate(gencreds, example_config):
     assert not lines[2]
 
 
+def test_invalid_localpart_characters(make_config):
+    """Test that is_allowed_to_create rejects localparts with invalid characters."""
+    config = make_config("chat.example.org", {"username_min_length": "3"})
+    password = "zequ0Aimuchoodaechik"
+    domain = config.mail_domain
+
+    # valid localparts
+    assert is_allowed_to_create(config, f"abc123@{domain}", password)
+    assert is_allowed_to_create(config, f"a.b-c_d@{domain}", password)
+
+    # uppercase rejected
+    assert not is_allowed_to_create(config, f"Abc123@{domain}", password)
+    assert not is_allowed_to_create(config, f"ABCDEFG@{domain}", password)
+
+    # spaces and special chars rejected
+    assert not is_allowed_to_create(config, f"a b cde@{domain}", password)
+    assert not is_allowed_to_create(config, f"abc+def@{domain}", password)
+    assert not is_allowed_to_create(config, f"abc!def@{domain}", password)
+    assert not is_allowed_to_create(config, f"ab@cdef@{domain}", password)
+    assert not is_allowed_to_create(config, f"abc/def@{domain}", password)
+    assert not is_allowed_to_create(config, f"abc\\def@{domain}", password)
+
+
+def test_concurrent_creation_same_account(dictproxy):
+    """Test that concurrent creation of the same account doesn't corrupt password."""
+    addr = "racetest1@chat.example.org"
+    password = "zequ0Aimuchoodaechik"
+    num_threads = 10
+    results = queue.Queue()
+
+    def create():
+        try:
+            res = dictproxy.lookup_passdb(addr, password)
+            results.put(("ok", res))
+        except Exception:
+            results.put(("err", traceback.format_exc()))
+
+    threads = [threading.Thread(target=create, daemon=True) for _ in range(num_threads)]
+    for t in threads:
+        t.start()
+    for t in threads:
+        t.join(timeout=10)
+
+    passwords_seen = set()
+    for _ in range(num_threads):
+        status, res = results.get()
+        if status == "err":
+            pytest.fail(f"concurrent creation failed\n{res}")
+        passwords_seen.add(res["password"])
+
+    # all threads must see the same password hash
+    assert len(passwords_seen) == 1
+
+
 def test_50_concurrent_lookups_different_accounts(gencreds, dictproxy):
     num_threads = 50
     req_per_thread = 5

chatmaild/src/chatmaild/tests/test_expire.py

@@ -1,5 +1,8 @@
+import itertools
 import os
 import random
+import shutil
+import time
 from datetime import datetime
 from fnmatch import fnmatch
 from pathlib import Path
@@ -7,15 +10,22 @@ from pathlib import Path
 import pytest
 
 from chatmaild.expire import (
+    Expiry,
     FileEntry,
     MailboxStat,
+    expire_to_target,
     get_file_entry,
     iter_mailboxes,
     os_listdir_if_exists,
+    parse_dovecot_filename,
+    quota_expire_main,
+    scan_mailbox_messages,
 )
-from chatmaild.expire import main as expiry_main
+from chatmaild.expire import daily_expire_main as expiry_main
 from chatmaild.fsreport import main as report_main
 
+MB = 1024 * 1024
+
 
 def fill_mbox(folderdir):
     password = folderdir.joinpath("password")
@@ -96,6 +106,32 @@ def test_stats_mailbox(mbox1):
     assert mbox3.last_login is None
 
 
+def test_mbox_without_password(mbox1, example_config, capsys):
+    password = Path(mbox1.basedir).joinpath("password")
+    os.remove(password)
+    mbox_rescan = MailboxStat(mbox1.basedir)
+    assert mbox_rescan.last_login is None
+
+    exp = Expiry(
+        example_config, dry=False, now=datetime.now().timestamp(), verbose=False
+    )
+    exp.process_mailbox_stat(mbox_rescan)
+    out, err = capsys.readouterr()
+    assert "doesn't have last_login but isn't empty" in err
+    assert os.path.isdir(mbox_rescan.basedir)
+
+    for entry in os.scandir(mbox_rescan.basedir):
+        if os.path.isdir(entry):
+            shutil.rmtree(entry)
+        else:
+            os.remove(entry)
+
+    exp.process_mailbox_stat(mbox_rescan)
+    out, err = capsys.readouterr()
+    assert "doesn't have last_login but isn't empty" not in err
+    assert not os.path.isdir(mbox_rescan.basedir)
+
+
 def test_report_no_mailboxes(example_config):
     args = (str(example_config._inipath),)
     report_main(args)
@@ -112,6 +148,43 @@ def test_report(mbox1, example_config):
     report_main(args)
 
 
+def test_report_mdir_filters_by_path(mbox1, example_config):
+    """Test that Report with mdir='cur' only counts messages in cur/ subdirectory."""
+    from chatmaild.fsreport import Report
+
+    now = datetime.utcnow().timestamp()
+
+    # Set password mtime to old enough so min_login_age check passes
+    password = Path(mbox1.basedir).joinpath("password")
+    old_time = now - 86400 * 10  # 10 days ago
+    os.utime(password, (old_time, old_time))
+
+    # Reload mailbox with updated mtime
+    from chatmaild.expire import MailboxStat
+
+    mbox = MailboxStat(mbox1.basedir)
+
+    # Report without mdir — should count all messages
+    rep_all = Report(now=now, min_login_age=1, mdir=None)
+    rep_all.process_mailbox_stat(mbox)
+    total_all = rep_all.message_buckets[0]
+
+    # Report with mdir='cur' — should only count cur/ messages
+    rep_cur = Report(now=now, min_login_age=1, mdir="cur")
+    rep_cur.process_mailbox_stat(mbox)
+    total_cur = rep_cur.message_buckets[0]
+
+    # Report with mdir='new' — should only count new/ messages
+    rep_new = Report(now=now, min_login_age=1, mdir="new")
+    rep_new.process_mailbox_stat(mbox)
+    total_new = rep_new.message_buckets[0]
+
+    # cur has 500-byte msg, new has 600-byte msg (from fill_mbox)
+    assert total_cur == 500
+    assert total_new == 600
+    assert total_all == 500 + 600
+
+
 def test_expiry_cli_basic(example_config, mbox1):
     args = (str(example_config._inipath),)
     expiry_main(args)
@@ -159,3 +232,51 @@ def test_os_listdir_if_exists(tmp_path):
     tmp_path.joinpath("x").write_text("hello")
     assert len(os_listdir_if_exists(str(tmp_path))) == 1
     assert len(os_listdir_if_exists(str(tmp_path.joinpath("123123")))) == 0
+
+
+# --- quota expire tests ---
+
+_msg_counter = itertools.count(1)
+
+
+def _create_message(basedir, sub, size, days_old=0, disk_size=None):
+    seq = next(_msg_counter)
+    mtime = int(time.time() - days_old * 86400)
+    name = f"{mtime}.M1P1Q{seq}.hostname,S={size},W={size}:2,S"
+    path = basedir / sub / name
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_bytes(b"x" * (disk_size if disk_size is not None else size))
+    os.utime(path, (mtime, mtime))
+    return path
+
+
+def test_parse_dovecot_filename():
+    e = parse_dovecot_filename("cur/1775324677.M448978P3029757.exam,S=3235,W=3305:2,S")
+    assert e.path == "cur/1775324677.M448978P3029757.exam,S=3235,W=3305:2,S"
+    assert e.mtime == 1775324677
+    assert e.quota_size == 3235
+    assert parse_dovecot_filename("cur/msg_without_structure") is None
+
+
+def test_expire_to_target(tmp_path):
+    _create_message(tmp_path, "cur", MB, days_old=10, disk_size=100)
+    _create_message(tmp_path, "new", MB, days_old=5)
+    _create_message(tmp_path, "cur", MB, days_old=0)  # undeletable (<1 hour)
+    assert len(scan_mailbox_messages(tmp_path)) == 3
+    # removes oldest first, uses S= size not disk size
+    removed = expire_to_target(tmp_path, MB)
+    assert removed == 2
+    msgs = scan_mailbox_messages(tmp_path)
+    assert len(msgs) == 1
+    # the surviving message is the fresh undeletable one
+    assert msgs[0].mtime > time.time() - 3600
+
+
+def test_quota_expire_main(tmp_path, capsys):
+    mbox = tmp_path / "user@example.org"
+    _create_message(mbox, "cur", 2 * MB, days_old=5)
+    (mbox / "maildirsize").write_text("x")
+    quota_expire_main([str(1), str(mbox)])
+    _, err = capsys.readouterr()
+    assert "quota-expire: removed 1 message(s) from user@example.org" in err
+    assert not (mbox / "maildirsize").exists()

chatmaild/src/chatmaild/tests/test_metadata.py

@@ -314,16 +314,87 @@ def test_persistent_queue_items(tmp_path, testaddr, token):
     assert not queue_item < item2 and not item2 < queue_item
 
 
-def test_iroh_relay(dictproxy):
-    rfile = io.BytesIO(
-        b"\n".join(
-            [
-                b"H",
-                b"Lshared/0123/vendor/vendor.dovecot/pvt/server/vendor/deltachat/irohrelay\tuser@example.org",
-            ]
-        )
+def test_turn_credentials_exception_returns_N(notifier, metadata, monkeypatch):
+    """Test that turn_credentials() failure returns N\\n instead of crashing."""
+    import chatmaild.metadata
+
+    dictproxy = MetadataDictProxy(
+        notifier=notifier,
+        metadata=metadata,
+        turn_hostname="turn.example.org",
     )
-    wfile = io.BytesIO()
+
+    def mock_turn_credentials(turn_socket_path):
+        raise ConnectionRefusedError("socket not available")
+
+    monkeypatch.setattr(chatmaild.metadata, "turn_credentials", mock_turn_credentials)
+
+    transactions = {}
+    res = dictproxy.handle_dovecot_request(
+        "Lshared/0123/vendor/vendor.dovecot/pvt/server/vendor/deltachat/turn"
+        "\tuser@example.org",
+        transactions,
+    )
+    assert res == "N\n"
+
+
+def test_turn_credentials_success(notifier, metadata, monkeypatch):
+    """Test that valid turn_credentials() returns TURN URI."""
+    import chatmaild.metadata
+
+    dictproxy = MetadataDictProxy(
+        notifier=notifier,
+        metadata=metadata,
+        turn_hostname="turn.example.org",
+    )
+
+    monkeypatch.setattr(
+        chatmaild.metadata, "turn_credentials", lambda path: "user:pass"
+    )
+
+    transactions = {}
+    res = dictproxy.handle_dovecot_request(
+        "Lshared/0123/vendor/vendor.dovecot/pvt/server/vendor/deltachat/turn"
+        "\tuser@example.org",
+        transactions,
+    )
+    assert res == "Oturn.example.org:3478:user:pass\n"
+
+
+def test_iroh_relay(dictproxy):
+    key = b"Lshared/0123/vendor/vendor.dovecot/pvt/server/vendor/deltachat/irohrelay\tuser@example.org"
+    rfile, wfile = io.BytesIO(b"H\n" + key), io.BytesIO()
     dictproxy.iroh_relay = "https://example.org/"
     dictproxy.loop_forever(rfile, wfile)
     assert wfile.getvalue() == b"Ohttps://example.org/\n"
+
+
+def test_legacy_token_migration(metadata, testaddr):
+    with metadata.get_metadata_dict(testaddr).modify() as data:
+        data[metadata.DEVICETOKEN_KEY] = ["oldtoken1", "oldtoken2"]
+
+    assert metadata.get_tokens_for_addr(testaddr) == ["oldtoken1", "oldtoken2"]
+    mdict = metadata.get_metadata_dict(testaddr).read()
+    tokens = mdict[metadata.DEVICETOKEN_KEY]
+    assert isinstance(tokens, dict)
+    assert "oldtoken1" in tokens and "oldtoken2" in tokens
+
+
+@pytest.mark.parametrize(
+    "suffix, expected",
+    [
+        (b"vendor/deltachat/maxsmtprecipients", b"O1000\n"),
+        (b"wrong/prefix/key", b"N\n"),
+        (b"vendor/deltachat/unknown", b"N\n"),
+    ],
+    ids=["maxsmtprecipients", "prefix_mismatch", "unknown_name"],
+)
+def test_shared_lookup(dictproxy, suffix, expected):
+    key = (
+        b"Lshared/0123/vendor/vendor.dovecot/pvt/server/"
+        + suffix
+        + b"\tuser@example.org"
+    )
+    rfile, wfile = io.BytesIO(b"H\n" + key), io.BytesIO()
+    dictproxy.loop_forever(rfile, wfile)
+    assert wfile.getvalue() == expected

chatmaild/src/chatmaild/tests/test_metrics.py

@@ -1,24 +0,0 @@
-from chatmaild.metrics import main
-
-
-def test_main(tmp_path, capsys):
-    paths = []
-    for x in ("ci-asllkj", "ac_12l3kj", "qweqwe", "ci-l1k2j31l2k3"):
-        p = tmp_path.joinpath(x)
-        p.mkdir()
-        p.joinpath("cur").mkdir()
-        paths.append(p)
-
-    tmp_path.joinpath("nomailbox").mkdir()
-
-    main(tmp_path)
-    out, _ = capsys.readouterr()
-    d = {}
-    for line in out.split("\n"):
-        if line.strip() and not line.startswith("#"):
-            name, num = line.split()
-            d[name] = int(num)
-
-    assert d["accounts"] == 4
-    assert d["ci_accounts"] == 3
-    assert d["nonci_accounts"] == 1

chatmaild/src/chatmaild/tests/test_migrate_db.py

@@ -48,6 +48,8 @@ def test_migration(tmp_path, example_config, caplog):
     assert passdb_path.stat().st_size > 10000
 
     example_config.passdb_path = passdb_path
+    # ensure logging.info records are captured regardless of global configuration
+    caplog.set_level("INFO")
 
     assert not caplog.records
 

chatmaild/src/chatmaild/tests/test_newmail.py

@@ -19,18 +19,35 @@ def test_create_newemail_dict(example_config):
     assert ac1["password"] != ac2["password"]
 
 
-def test_create_dclogin_url():
-    url = create_dclogin_url("user@example.org", "p@ss w+rd")
+def test_create_newemail_dict_ip(ipv4_config):
+    ac = create_newemail_dict(ipv4_config)
+    assert ac["email"].endswith("@[1.3.3.7]")
+
+
+def test_create_dclogin_url(example_config):
+    addr = "user@example.org"
+    password = "p@ss w+rd"
+    url = create_dclogin_url(example_config, addr, password)
     assert url.startswith("dclogin:")
     assert "v=1" in url
     assert "ic=3" in url
 
-    assert "user@example.org" in url
+    assert addr in url
     # password special chars must be encoded
     assert "p%40ss" in url
     assert "w%2Brd" in url
 
 
+def test_create_dclogin_url_ipv4(ipv4_config):
+    addr = "user@[1.3.3.7]"
+    password = "p@ss w+rd"
+    url = create_dclogin_url(ipv4_config, addr, password)
+    assert url.startswith("dclogin:")
+    assert "v=1" in url
+    assert "ic=3" in url
+    assert addr in url
+
+
 def test_print_new_account(capsys, monkeypatch, maildomain, tmpdir, example_config):
     monkeypatch.setattr(chatmaild.newemail, "CONFIG_PATH", str(example_config._inipath))
     print_new_account()

chatmaild/src/chatmaild/tests/test_turn.py

@@ -0,0 +1,46 @@
+import socket
+import threading
+
+import pytest
+
+from chatmaild.metadata import turn_credentials
+
+
+@pytest.fixture
+def turn_socket(tmp_path):
+    sock_path = str(tmp_path / "turn.socket")
+    server = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    server.bind(sock_path)
+    server.listen(1)
+    yield sock_path, server
+    server.close()
+
+
+def test_turn_credentials_timeout(turn_socket):
+    sock_path, server = turn_socket
+    with pytest.raises(socket.timeout):
+        # Inside turn_credentials the kernel listen backlog (1)
+        # completes connect() without accept()
+        # so the client blocks on readline() until the 5s timeout fires.
+        turn_credentials(sock_path)
+
+
+def test_turn_credentials_connection_refused_on_not_existing_socket(tmp_path):
+    missing = str(tmp_path / "nonexistent.socket")
+    with pytest.raises((ConnectionRefusedError, FileNotFoundError)):
+        turn_credentials(missing)
+
+
+def test_turn_credentials_socket_success(turn_socket):
+    sock_path, server = turn_socket
+
+    def respond():
+        conn, _ = server.accept()
+        conn.sendall(b"testuser:testpass\n")
+        conn.close()
+
+    t = threading.Thread(target=respond, daemon=True)
+    t.start()
+
+    result = turn_credentials(sock_path)
+    assert result == "testuser:testpass"

chatmaild/src/chatmaild/turnserver.py

@@ -1,9 +0,0 @@
-#!/usr/bin/env python3
-import socket
-
-
-def turn_credentials() -> str:
-    with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as client_socket:
-        client_socket.connect("/run/chatmail-turn/turn.socket")
-        with client_socket.makefile("rb") as file:
-            return file.readline().decode("utf-8").strip()

cmdeploy/pyproject.toml

@@ -10,7 +10,6 @@ dependencies = [
   "pillow",
   "qrcode",
   "markdown",
-  "pytest",
   "setuptools>=68",
   "termcolor",
   "build",
@@ -21,6 +20,7 @@ dependencies = [
   "execnet",
   "imap_tools",
   "deltachat-rpc-client",
+  "deltachat-rpc-server",
 ]
 
 [project.scripts]

cmdeploy/src/cmdeploy/acmetool/__init__.py

@@ -1,6 +1,4 @@
-import importlib.resources
-
-from pyinfra.operations import apt, files, server, systemd
+from pyinfra.operations import apt, server
 
 from ..basedeploy import Deployer
 
@@ -9,9 +7,6 @@ class AcmetoolDeployer(Deployer):
     def __init__(self, email, domains):
         self.domains = domains
         self.email = email
-        self.need_restart_redirector = False
-        self.need_restart_reconcile_service = False
-        self.need_restart_reconcile_timer = False
 
     def install(self):
         apt.packages(
@@ -19,121 +14,41 @@ class AcmetoolDeployer(Deployer):
             packages=["acmetool"],
         )
 
-        files.file(
-            name="Remove old acmetool cronjob, it is replaced with systemd timer.",
-            path="/etc/cron.d/acmetool",
-            present=False,
-        )
+        self.remove_file("/etc/cron.d/acmetool")
 
-        files.put(
-            name="Install acmetool hook.",
-            src=importlib.resources.files(__package__)
-            .joinpath("acmetool.hook")
-            .open("rb"),
-            dest="/etc/acme/hooks/nginx",
-            user="root",
-            group="root",
-            mode="755",
-        )
-        files.file(
-            name="Remove acmetool hook from the wrong location where it was previously installed.",
-            path="/usr/lib/acme/hooks/nginx",
-            present=False,
-        )
+        self.put_executable("acmetool/acmetool.hook", "/etc/acme/hooks/nginx")
+        self.remove_file("/usr/lib/acme/hooks/nginx")
 
     def configure(self):
-        files.template(
-            src=importlib.resources.files(__package__).joinpath(
-                "response-file.yaml.j2"
-            ),
-            dest="/var/lib/acme/conf/responses",
-            user="root",
-            group="root",
-            mode="644",
+        self.put_template(
+            "acmetool/response-file.yaml.j2",
+            "/var/lib/acme/conf/responses",
             email=self.email,
         )
 
-        files.template(
-            src=importlib.resources.files(__package__).joinpath("target.yaml.j2"),
-            dest="/var/lib/acme/conf/target",
-            user="root",
-            group="root",
-            mode="644",
+        self.put_template(
+            "acmetool/target.yaml.j2",
+            "/var/lib/acme/conf/target",
         )
 
         server.shell(
             name=f"Remove old acmetool desired files for {self.domains[0]}",
             commands=[f"rm -f /var/lib/acme/desired/{self.domains[0]}-*"],
         )
-        files.template(
-            src=importlib.resources.files(__package__).joinpath("desired.yaml.j2"),
-            dest=f"/var/lib/acme/desired/{self.domains[0]}", # 0 is mailhost TLD
-            user="root",
-            group="root",
-            mode="644",
+        self.put_template(
+            "acmetool/desired.yaml.j2",
+            f"/var/lib/acme/desired/{self.domains[0]}",
             domains=self.domains,
         )
 
-        service_file = files.put(
-            src=importlib.resources.files(__package__).joinpath(
-                "acmetool-redirector.service"
-            ),
-            dest="/etc/systemd/system/acmetool-redirector.service",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        self.need_restart_redirector = service_file.changed
-
-        reconcile_service_file = files.put(
-            src=importlib.resources.files(__package__).joinpath(
-                "acmetool-reconcile.service"
-            ),
-            dest="/etc/systemd/system/acmetool-reconcile.service",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        self.need_restart_reconcile_service = reconcile_service_file.changed
-
-        reconcile_timer_file = files.put(
-            src=importlib.resources.files(__package__).joinpath(
-                "acmetool-reconcile.timer"
-            ),
-            dest="/etc/systemd/system/acmetool-reconcile.timer",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        self.need_restart_reconcile_timer = reconcile_timer_file.changed
+        self.ensure_systemd_unit("acmetool/acmetool-redirector.service")
+        self.ensure_systemd_unit("acmetool/acmetool-reconcile.service")
+        self.ensure_systemd_unit("acmetool/acmetool-reconcile.timer")
 
     def activate(self):
-        systemd.service(
-            name="Setup acmetool-redirector service",
-            service="acmetool-redirector.service",
-            running=True,
-            enabled=True,
-            restarted=self.need_restart_redirector,
-        )
-        self.need_restart_redirector = False
-
-        systemd.service(
-            name="Setup acmetool-reconcile service",
-            service="acmetool-reconcile.service",
-            running=False,
-            enabled=False,
-            daemon_reload=self.need_restart_reconcile_service,
-        )
-        self.need_restart_reconcile_service = False
-
-        systemd.service(
-            name="Setup acmetool-reconcile timer",
-            service="acmetool-reconcile.timer",
-            running=True,
-            enabled=True,
-            daemon_reload=self.need_restart_reconcile_timer,
-        )
-        self.need_restart_reconcile_timer = False
+        self.ensure_service("acmetool-redirector.service")
+        self.ensure_service("acmetool-reconcile.service", running=False, enabled=False)
+        self.ensure_service("acmetool-reconcile.timer")
 
         server.shell(
             name=f"Reconcile certificates for: {', '.join(self.domains)}",

cmdeploy/src/cmdeploy/acmetool/response-file.yaml.j2

@@ -1,2 +1,2 @@
 "acme-enter-email": "{{ email }}"
-"acme-agreement:https://letsencrypt.org/documents/LE-SA-v1.6-August-18-2025.pdf": true
+"acme-agreement:https://letsencrypt.org/documents/LE-SA-v1.8-July-06-2026.pdf": true

cmdeploy/src/cmdeploy/basedeploy.py

@@ -1,7 +1,11 @@
 import importlib.resources
 import io
 import os
+from contextlib import contextmanager
 
+from pyinfra import host
+from pyinfra.facts.files import Sha256File
+from pyinfra.facts.server import Command
 from pyinfra.operations import files, server, systemd
 
 
@@ -10,15 +14,47 @@ def has_systemd():
     return os.path.isdir("/run/systemd/system")
 
 
+def is_in_container() -> bool:
+    """Return True if running inside a container (Docker, LXC, etc.)."""
+    return (
+        host.get_fact(
+            Command,
+            "systemd-detect-virt --container --quiet 2>/dev/null && echo yes || true",
+        )
+        == "yes"
+    )
+
+
+@contextmanager
+def blocked_service_startup():
+    """Prevent services from auto-starting during package installation.
+
+    Installs a ``/usr/sbin/policy-rc.d`` that exits 101, blocking any
+    service from being started by the package manager.  This avoids bind
+    conflicts and CPU/RAM spikes during initial setup.  The file is removed
+    when the context exits.
+    """
+    # For documentation about policy-rc.d, see:
+    # https://people.debian.org/~hmh/invokerc.d-policyrc.d-specification.txt
+    files.put(
+        src=get_resource("policy-rc.d"),
+        dest="/usr/sbin/policy-rc.d",
+        user="root",
+        group="root",
+        mode="755",
+    )
+    yield
+    files.file("/usr/sbin/policy-rc.d", present=False)
+
+
 def get_resource(arg, pkg=__package__):
     return importlib.resources.files(pkg).joinpath(arg)
 
 
-def configure_remote_units(mail_domain, units) -> None:
+def configure_remote_units(deployer, mail_domain, units) -> None:
     remote_base_dir = "/usr/local/lib/chatmaild"
     remote_venv_dir = f"{remote_base_dir}/venv"
     remote_chatmail_inipath = f"{remote_base_dir}/chatmail.ini"
-    root_owned = dict(user="root", group="root", mode="644")
 
     # install systemd units
     for fn in units:
@@ -34,15 +70,13 @@ def configure_remote_units(mail_domain, units) -> None:
         source_path = get_resource(f"service/{basename}.f")
         content = source_path.read_text().format(**params).encode()
 
-        files.put(
-            name=f"Upload {basename}",
+        deployer.put_file(
             src=io.BytesIO(content),
             dest=f"/etc/systemd/system/{basename}",
-            **root_owned,
         )
 
 
-def activate_remote_units(units) -> None:
+def activate_remote_units(deployer, units) -> None:
     # activate systemd units
     for fn in units:
         basename = fn if "." in fn else f"{fn}.service"
@@ -52,14 +86,8 @@ def activate_remote_units(units) -> None:
             enabled = False
         else:
             enabled = True
-        systemd.service(
-            name=f"Setup {basename}",
-            service=basename,
-            running=enabled,
-            enabled=enabled,
-            restarted=enabled,
-            daemon_reload=True,
-        )
+
+        deployer.ensure_service(basename, running=enabled, enabled=enabled)
 
 
 class Deployment:
@@ -105,6 +133,7 @@ class Deployment:
 
 class Deployer:
     need_restart = False
+    daemon_reload = False
 
     def install(self):
         pass
@@ -114,3 +143,114 @@ class Deployer:
 
     def activate(self):
         pass
+
+    def ensure_service(self, service, running=True, enabled=True):
+        if running:
+            verb = "Start and enable"
+        else:
+            verb = "Stop"
+        systemd.service(
+            name=f"{verb} {service}",
+            service=service,
+            running=running,
+            enabled=enabled,
+            restarted=self.need_restart if running else False,
+            daemon_reload=self.daemon_reload,
+        )
+        self.daemon_reload = False
+
+    def ensure_systemd_unit(self, src, **kwargs):
+        dest_name = src.split("/")[-1].replace(".j2", "")
+        dest = f"/etc/systemd/system/{dest_name}"
+        if src.endswith(".j2"):
+            return self.put_template(src, dest, **kwargs)
+        return self.put_file(src, dest)
+
+    def put_file(self, src, dest, mode="644", **kwargs):
+        if isinstance(src, str):
+            src = get_resource(src)
+        res = files.put(
+            name=f"Upload {dest}",
+            src=src,
+            dest=dest,
+            user="root",
+            group="root",
+            mode=mode,
+            **kwargs,
+        )
+
+        return self._update_restart_signals(dest, res)
+
+    def put_executable(self, src, dest):
+        return self.put_file(src, dest, mode="755")
+
+    def put_template(self, src, dest, owner="root", **kwargs):
+        if isinstance(src, str):
+            src = get_resource(src)
+        res = files.template(
+            name=f"Upload {dest}",
+            src=src,
+            dest=dest,
+            user=owner,
+            group=owner,
+            mode="644",
+            **kwargs,
+        )
+
+        return self._update_restart_signals(dest, res)
+
+    def remove_file(self, dest):
+        res = files.file(name=f"Remove {dest}", path=dest, present=False)
+        return self._update_restart_signals(dest, res)
+
+    def ensure_line(self, path, line, **kwargs):
+        name = kwargs.pop("name", f"Ensure line in {path}")
+        res = files.line(name=name, path=path, line=line, **kwargs)
+        return self._update_restart_signals(path, res)
+
+    def ensure_directory(self, path, owner="root", mode="755", **kwargs):
+        name = kwargs.pop("name", f"Ensure directory {path}")
+        res = files.directory(
+            name=name,
+            path=path,
+            user=owner,
+            group=owner,
+            mode=mode,
+            present=True,
+            **kwargs,
+        )
+        return self._update_restart_signals(path, res)
+
+    def remove_directory(self, path, **kwargs):
+        name = kwargs.pop("name", f"Remove directory {path}")
+        res = files.directory(name=name, path=path, present=False, **kwargs)
+        return self._update_restart_signals(path, res)
+
+    def download_executable(self, url, dest, sha256sum, extract=None):
+        existing = host.get_fact(Sha256File, dest)
+        if existing == sha256sum:
+            return
+
+        tmp = f"{dest}.new"
+        if extract:
+            dl_cmd = f"curl -fSL {url} | {extract} >{tmp}"
+        else:
+            dl_cmd = f"curl -fSL {url} -o {tmp}"
+
+        server.shell(
+            name=f"Download {dest}",
+            commands=[
+                f"({dl_cmd}"
+                f" && echo '{sha256sum}  {tmp}' | sha256sum -c"
+                f" && mv {tmp} {dest})",
+                f"chmod 755 {dest}",
+            ],
+        )
+        self.need_restart = True
+
+    def _update_restart_signals(self, path, res):
+        if res.changed:
+            self.need_restart = True
+            if str(path).startswith("/etc/systemd/system/"):
+                self.daemon_reload = True
+        return res

cmdeploy/src/cmdeploy/chatmail.zone.j2

@@ -1,32 +0,0 @@
-;
-; Required DNS entries for chatmail servers 
-;
-{% if A %}
-{{ mail_domain }}.                   A     {{ A }}
-{% endif %}
-{% if AAAA %}
-{{ mail_domain }}.                   AAAA  {{ AAAA }}
-{% endif %}
-{{ mail_domain }}.                   MX 10 {{ mail_domain }}.
-{% if strict_tls %}
-_mta-sts.{{ mail_domain }}.          TXT "v=STSv1; id={{ sts_id }}"
-mta-sts.{{ mail_domain }}.           CNAME {{ mail_domain }}.
-{% endif %}
-www.{{ mail_domain }}.               CNAME {{ mail_domain }}.
-{{ dkim_entry }}
-
-;
-; Recommended DNS entries for interoperability and security-hardening
-;
-{{ mail_domain }}.                   TXT "v=spf1 a ~all"
-_dmarc.{{ mail_domain }}.            TXT "v=DMARC1;p=reject;adkim=s;aspf=s"
-
-{% if acme_account_url %}
-{{ mail_domain }}.                   CAA 0 issue "letsencrypt.org;accounturi={{ acme_account_url }}"
-{% endif %}
-_adsp._domainkey.{{ mail_domain }}.  TXT "dkim=discardable"
-
-_submission._tcp.{{ mail_domain }}.  SRV 0 1 587 {{ mail_domain }}.
-_submissions._tcp.{{ mail_domain }}. SRV 0 1 465 {{ mail_domain }}.
-_imap._tcp.{{ mail_domain }}.        SRV 0 1 143 {{ mail_domain }}.
-_imaps._tcp.{{ mail_domain }}.       SRV 0 1 993 {{ mail_domain }}.

cmdeploy/src/cmdeploy/cmdeploy.py

@@ -84,13 +84,24 @@ def run_cmd_options(parser):
     add_ssh_host_option(parser)
 
 
+def _warn_unused_settings(unused_keys, out):
+    if unused_keys:
+        names = ", ".join(unused_keys)
+        out.red(
+            f"WARNING: chatmail.ini contains settings that have no effect: {names}\n"
+            "Please remove them from chatmail.ini."
+        )
+
+
 def run_cmd(args, out):
     """Deploy chatmail services on the remote server."""
 
-    ssh_host = args.ssh_host if args.ssh_host else args.config.mail_domain
+    ssh_host = args.ssh_host if args.ssh_host else args.config.mail_domain_bare
     sshexec = get_sshexec(ssh_host)
     require_iroh = args.config.enable_iroh_relay
     strict_tls = args.config.tls_cert_mode == "acme"
+    if args.config.ipv4_relay:
+        args.dns_check_disabled = True
     if not args.dns_check_disabled:
         remote_data = dns.get_initial_remote_data(sshexec, args.config.mail_domain)
         if not dns.check_initial_remote_data(remote_data, strict_tls=strict_tls, print=out.red):
@@ -101,9 +112,6 @@ def run_cmd(args, out):
     env["CHATMAIL_WEBSITE_ONLY"] = "True" if args.website_only else ""
     env["CHATMAIL_DISABLE_MAIL"] = "True" if args.disable_mail else ""
     env["CHATMAIL_REQUIRE_IROH"] = "True" if require_iroh else ""
-    if not args.dns_check_disabled:
-        env["CHATMAIL_ADDR_V4"] = remote_data.get("A") or ""
-        env["CHATMAIL_ADDR_V6"] = remote_data.get("AAAA") or ""
     deploy_path = importlib.resources.files(__package__).joinpath("run.py").resolve()
     pyinf = "pyinfra --dry" if args.dry_run else "pyinfra"
 
@@ -116,24 +124,21 @@ def run_cmd(args, out):
         return 1
 
     try:
-        retcode = out.check_call(cmd, env=env)
+        out.check_call(cmd, env=env)
         if args.website_only:
-            if retcode == 0:
-                out.green("Website deployment completed.")
-            else:
-                out.red("Website deployment failed.")
-        elif retcode == 0:
-            out.green("Deploy completed, call `cmdeploy dns` next.")
+            out.green("Website deployment completed.")
         elif not args.dns_check_disabled and strict_tls and not remote_data["acme_account_url"]:
             out.red("Deploy completed but letsencrypt not configured")
             out.red("Run 'cmdeploy run' again")
-            retcode = 0
+        elif args.config.ipv4_relay:
+            out.green("Deploy completed.")
         else:
-            out.red("Deploy failed")
+            out.green("Deploy completed, call `cmdeploy dns` next.")
+        _warn_unused_settings(args.config._unused_keys, out)
+        return 0
     except subprocess.CalledProcessError:
         out.red("Deploy failed")
-        retcode = 1
-    return retcode
+        return 1
 
 
 def dns_cmd_options(parser):
@@ -149,6 +154,10 @@ def dns_cmd_options(parser):
 
 def dns_cmd(args, out):
     """Check DNS entries and optionally generate dns zone file."""
+    if args.config.ipv4_relay:
+        ipv4 = args.config.ipv4_relay
+        print(f"[WARNING] {ipv4} is not a domain, skipping DNS checks.")
+        return 0
     ssh_host = args.ssh_host if args.ssh_host else args.config.mail_domain
     sshexec = get_sshexec(ssh_host, verbose=args.verbose)
     tls_cert_mode = args.config.tls_cert_mode
@@ -186,7 +195,7 @@ def status_cmd_options(parser):
 def status_cmd(args, out):
     """Display status for online chatmail instance."""
 
-    ssh_host = args.ssh_host if args.ssh_host else args.config.mail_domain
+    ssh_host = args.ssh_host if args.ssh_host else args.config.mail_domain_bare
     sshexec = get_sshexec(ssh_host, verbose=args.verbose)
 
     out.green(f"chatmail domain: {args.config.mail_domain}")
@@ -200,12 +209,6 @@ def status_cmd(args, out):
 
 
 def test_cmd_options(parser):
-    parser.add_argument(
-        "--slow",
-        dest="slow",
-        action="store_true",
-        help="also run slow tests",
-    )
     add_ssh_host_option(parser)
 
 
@@ -213,6 +216,7 @@ def test_cmd(args, out):
     """Run local and online tests for chatmail deployment."""
 
     env = os.environ.copy()
+    env["CHATMAIL_INI"] = str(args.inipath.absolute())
     if args.ssh_host:
         env["CHATMAIL_SSH"] = args.ssh_host
 
@@ -226,8 +230,6 @@ def test_cmd(args, out):
         "-v",
         "--durations=5",
     ]
-    if args.slow:
-        pytest_args.append("--slow")
     ret = out.run_ret(pytest_args, env=env)
     return ret
 

cmdeploy/src/cmdeploy/deployers.py

@@ -2,18 +2,16 @@
 Chat Mail pyinfra deploy.
 """
 
-import os
 import shutil
 import subprocess
 import sys
-from io import StringIO
+from io import BytesIO, StringIO
 from pathlib import Path
 
 from chatmaild.config import read_config
 from pyinfra import facts, host, logger
 from pyinfra.api import FactBase
 from pyinfra.facts import hardware
-from pyinfra.facts.files import Sha256File
 from pyinfra.facts.systemd import SystemdEnabled
 from pyinfra.operations import apt, files, pip, server, systemd
 
@@ -24,9 +22,10 @@ from .basedeploy import (
     Deployer,
     Deployment,
     activate_remote_units,
+    blocked_service_startup,
     configure_remote_units,
-    get_resource,
     has_systemd,
+    is_in_container,
 )
 from .dovecot.deployer import DovecotDeployer
 from .external.deployer import ExternalTlsDeployer
@@ -81,25 +80,22 @@ def remove_legacy_artifacts():
         )
 
 
-def _install_remote_venv_with_chatmaild() -> None:
+def _install_remote_venv_with_chatmaild(deployer) -> None:
     remove_legacy_artifacts()
     dist_file = _build_chatmaild(dist_dir=Path("chatmaild/dist"))
     remote_base_dir = "/usr/local/lib/chatmaild"
     remote_dist_file = f"{remote_base_dir}/dist/{dist_file.name}"
     remote_venv_dir = f"{remote_base_dir}/venv"
-    root_owned = dict(user="root", group="root", mode="644")
 
     apt.packages(
         name="apt install python3-virtualenv",
         packages=["python3-virtualenv"],
     )
 
-    files.put(
-        name="Upload chatmaild source package",
+    deployer.ensure_directory(f"{remote_base_dir}/dist")
+    deployer.put_file(
         src=dist_file.open("rb"),
         dest=remote_dist_file,
-        create_remote_dir=True,
-        **root_owned,
     )
 
     pip.virtualenv(
@@ -121,94 +117,69 @@ def _install_remote_venv_with_chatmaild() -> None:
     )
 
 
-def _configure_remote_venv_with_chatmaild(config) -> None:
+def _configure_remote_venv_with_chatmaild(deployer, config) -> None:
     remote_base_dir = "/usr/local/lib/chatmaild"
-    remote_venv_dir = f"{remote_base_dir}/venv"
     remote_chatmail_inipath = f"{remote_base_dir}/chatmail.ini"
-    root_owned = dict(user="root", group="root", mode="644")
 
-    files.put(
-        name=f"Upload {remote_chatmail_inipath}",
+    deployer.put_file(
         src=config._getbytefile(),
         dest=remote_chatmail_inipath,
-        **root_owned,
     )
 
-    files.template(
-        src=get_resource("metrics.cron.j2"),
-        dest="/etc/cron.d/chatmail-metrics",
-        user="root",
-        group="root",
-        mode="644",
-        config={
-            "mailboxes_dir": config.mailboxes_dir,
-            "execpath": f"{remote_venv_dir}/bin/chatmail-metrics",
-        },
-    )
+    deployer.remove_file("/etc/cron.d/chatmail-metrics")
+    deployer.remove_file("/var/www/html/metrics")
 
 
 class UnboundDeployer(Deployer):
     def __init__(self, config):
         self.config = config
-        self.need_restart = False
 
     def install(self):
-        # Run local DNS resolver `unbound`.
-        # `resolvconf` takes care of setting up /etc/resolv.conf
-        # to use 127.0.0.1 as the resolver.
-
-        #
-        # On an IPv4-only system, if unbound is started but not
-        # configured, it causes subsequent steps to fail to resolve hosts.
-        # Here, we use policy-rc.d to prevent unbound from starting up
-        # on initial install.  Later, we will configure it and start it.
-        #
-        # For documentation about policy-rc.d, see:
-        # https://people.debian.org/~hmh/invokerc.d-policyrc.d-specification.txt
-        #
-        files.put(
-            src=get_resource("policy-rc.d"),
-            dest="/usr/sbin/policy-rc.d",
-            user="root",
-            group="root",
-            mode="755",
-        )
-
-        apt.packages(
-            name="Install unbound",
-            packages=["unbound", "unbound-anchor", "dnsutils"],
-        )
-
-        files.file("/usr/sbin/policy-rc.d", present=False)
+        # On an IPv4-only system, if unbound is started but not configured,
+        # it causes subsequent steps to fail to resolve hosts.
+        with blocked_service_startup():
+            apt.packages(
+                name="Install unbound",
+                packages=["unbound", "unbound-anchor", "dnsutils"],
+            )
 
     def configure(self):
+        # Remove dynamic resolver managers that compete for /etc/resolv.conf.
+        apt.packages(
+            name="Purge resolvconf",
+            packages=["resolvconf"],
+            present=False,
+            extra_uninstall_args="--purge",
+        )
+        # systemd-resolved can't be purged due to dependencies; stop and mask.
+        server.shell(
+            name="Stop and mask systemd-resolved",
+            commands=[
+                "systemctl stop systemd-resolved.service || true",
+                "systemctl mask systemd-resolved.service",
+            ],
+        )
+        # Configure unbound resolver with Quad9 fallback and a trailing newline
+        # (SolusVM bug).
+        self.put_file(
+            src=BytesIO(b"nameserver 127.0.0.1\nnameserver 9.9.9.9\n"),
+            dest="/etc/resolv.conf",
+            force=True,
+        )
         server.shell(
             name="Generate root keys for validating DNSSEC",
             commands=[
                 "unbound-anchor -a /var/lib/unbound/root.key || true",
             ],
         )
-        if self.config.disable_ipv6:
-            files.directory(
-                path="/etc/unbound/unbound.conf.d",
-                present=True,
-                user="root",
-                group="root",
-                mode="755",
-            )
-            conf = files.put(
-                src=get_resource("unbound/unbound.conf.j2"),
-                dest="/etc/unbound/unbound.conf.d/chatmail.conf",
-                user="root",
-                group="root",
-                mode="644",
-            )
-        else:
-            conf = files.file(
-                path="/etc/unbound/unbound.conf.d/chatmail.conf",
-                present=False,
-            )
-        self.need_restart |= conf.changed
+        self.ensure_directory(
+            path="/etc/unbound/unbound.conf.d",
+        )
+        self.put_template(
+            "unbound/unbound.conf.j2",
+            "/etc/unbound/unbound.conf.d/chatmail.conf",
+            disable_ipv6=self.config.disable_ipv6,
+        )
 
     def activate(self):
         server.shell(
@@ -218,27 +189,25 @@ class UnboundDeployer(Deployer):
             ],
         )
 
-        systemd.service(
-            name="Start and enable unbound",
-            service="unbound.service",
-            running=True,
-            enabled=True,
-            restarted=self.need_restart,
+        self.ensure_service("unbound.service")
+
+        self.ensure_service(
+            "unbound-resolvconf.service",
+            running=False,
+            enabled=False,
         )
 
 
 class MtastsDeployer(Deployer):
     def configure(self):
         # Remove configuration.
-        files.file("/etc/mta-sts-daemon.yml", present=False)
-        files.directory("/usr/local/lib/postfix-mta-sts-resolver", present=False)
-        files.file("/etc/systemd/system/mta-sts-daemon.service", present=False)
+        self.remove_file("/etc/mta-sts-daemon.yml")
+        self.remove_directory("/usr/local/lib/postfix-mta-sts-resolver")
+        self.remove_file("/etc/systemd/system/mta-sts-daemon.service")
 
     def activate(self):
-        systemd.service(
-            name="Stop MTA-STS daemon",
-            service="mta-sts-daemon.service",
-            daemon_reload=True,
+        self.ensure_service(
+            "mta-sts-daemon.service",
             running=False,
             enabled=False,
         )
@@ -249,14 +218,7 @@ class WebsiteDeployer(Deployer):
         self.config = config
 
     def install(self):
-        files.directory(
-            name="Ensure /var/www exists",
-            path="/var/www",
-            user="root",
-            group="root",
-            mode="755",
-            present=True,
-        )
+        self.ensure_directory("/var/www")
 
     def configure(self):
         www_path, src_dir, build_dir = get_paths(self.config)
@@ -271,6 +233,9 @@ class WebsiteDeployer(Deployer):
             # if www_folder is a hugo page, build it
             if build_dir:
                 www_path = build_webpages(src_dir, build_dir, self.config)
+                if www_path is None:
+                    logger.warning("Web page build failed, skipping website deployment")
+                    return
             # if it is not a hugo page, upload it as is
             files.rsync(
                 f"{www_path}/", "/var/www/html", flags=["-avz", "--chown=www-data"]
@@ -283,15 +248,11 @@ class LegacyRemoveDeployer(Deployer):
 
         # remove historic expunge script
         # which is now implemented through a systemd timer (chatmail-expire)
-        files.file(
-            path="/etc/cron.d/expunge",
-            present=False,
-        )
+        self.remove_file("/etc/cron.d/expunge")
 
         # Remove OBS repository key that is no longer used.
-        files.file("/etc/apt/keyrings/obs-home-deltachat.gpg", present=False)
-        files.line(
-            name="Remove DeltaChat OBS home repository from sources.list",
+        self.remove_file("/etc/apt/keyrings/obs-home-deltachat.gpg")
+        self.ensure_line(
             path="/etc/apt/sources.list",
             line="deb [signed-by=/etc/apt/keyrings/obs-home-deltachat.gpg] https://download.opensuse.org/repositories/home:/deltachat/Debian_12/ ./",
             escape_regex_characters=True,
@@ -299,11 +260,7 @@ class LegacyRemoveDeployer(Deployer):
         )
 
         # prior relay versions used filelogging
-        files.directory(
-            name="Ensure old logs on disk are deleted",
-            path="/var/log/journal/",
-            present=False,
-        )
+        self.remove_directory("/var/log/journal/")
         # remove echobot if it is still running
         if has_systemd() and host.get_fact(SystemdEnabled).get("echobot.service"):
             systemd.service(
@@ -337,30 +294,21 @@ class TurnDeployer(Deployer):
     def install(self):
         (url, sha256sum) = {
             "x86_64": (
-                "https://github.com/chatmail/chatmail-turn/releases/download/v0.3/chatmail-turn-x86_64-linux",
-                "841e527c15fdc2940b0469e206188ea8f0af48533be12ecb8098520f813d41e4",
+                "https://github.com/chatmail/chatmail-turn/releases/download/v0.4/chatmail-turn-x86_64-linux",
+                "1ec1f5c50122165e858a5a91bcba9037a28aa8cb8b64b8db570aa457c6141a8a",
             ),
             "aarch64": (
-                "https://github.com/chatmail/chatmail-turn/releases/download/v0.3/chatmail-turn-aarch64-linux",
-                "a5fc2d06d937b56a34e098d2cd72a82d3e89967518d159bf246dc69b65e81b42",
+                "https://github.com/chatmail/chatmail-turn/releases/download/v0.4/chatmail-turn-aarch64-linux",
+                "0fb3e792419494e21ecad536464929dba706bb2c88884ed8f1788141d26fc756",
             ),
         }[host.get_fact(facts.server.Arch)]
-
-        existing_sha256sum = host.get_fact(Sha256File, "/usr/local/bin/chatmail-turn")
-        if existing_sha256sum != sha256sum:
-            server.shell(
-                name="Download chatmail-turn",
-                commands=[
-                    f"(curl -L {url} >/usr/local/bin/chatmail-turn.new && (echo '{sha256sum} /usr/local/bin/chatmail-turn.new' | sha256sum -c) && mv /usr/local/bin/chatmail-turn.new /usr/local/bin/chatmail-turn)",
-                    "chmod 755 /usr/local/bin/chatmail-turn",
-                ],
-            )
+        self.download_executable(url, "/usr/local/bin/chatmail-turn", sha256sum)
 
     def configure(self):
-        configure_remote_units(self.mail_domain, self.units)
+        configure_remote_units(self, self.mail_domain, self.units)
 
     def activate(self):
-        activate_remote_units(self.units)
+        activate_remote_units(self, self.units)
 
 
 class IrohDeployer(Deployer):
@@ -378,72 +326,30 @@ class IrohDeployer(Deployer):
                 "f8ef27631fac213b3ef668d02acd5b3e215292746a3fc71d90c63115446008b1",
             ),
         }[host.get_fact(facts.server.Arch)]
-
-        existing_sha256sum = host.get_fact(Sha256File, "/usr/local/bin/iroh-relay")
-        if existing_sha256sum != sha256sum:
-            server.shell(
-                name="Download iroh-relay",
-                commands=[
-                    f"(curl -L {url} | gunzip | tar -x -f - ./iroh-relay -O >/usr/local/bin/iroh-relay.new && (echo '{sha256sum} /usr/local/bin/iroh-relay.new' | sha256sum -c) && mv /usr/local/bin/iroh-relay.new /usr/local/bin/iroh-relay)",
-                    "chmod 755 /usr/local/bin/iroh-relay",
-                ],
-            )
-
-            self.need_restart = True
+        self.download_executable(
+            url,
+            "/usr/local/bin/iroh-relay",
+            sha256sum,
+            extract="gunzip | tar -xf - ./iroh-relay -O",
+        )
 
     def configure(self):
-        systemd_unit = files.put(
-            name="Upload iroh-relay systemd unit",
-            src=get_resource("iroh-relay.service"),
-            dest="/etc/systemd/system/iroh-relay.service",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        self.need_restart |= systemd_unit.changed
-
-        iroh_config = files.put(
-            name="Upload iroh-relay config",
-            src=get_resource("iroh-relay.toml"),
-            dest="/etc/iroh-relay.toml",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        self.need_restart |= iroh_config.changed
+        self.ensure_systemd_unit("iroh-relay.service")
+        self.put_file("iroh-relay.toml", "/etc/iroh-relay.toml")
 
     def activate(self):
-        systemd.service(
-            name="Start and enable iroh-relay",
-            service="iroh-relay.service",
-            running=True,
+        self.ensure_service(
+            "iroh-relay.service",
             enabled=self.enable_iroh_relay,
-            restarted=self.need_restart,
         )
-        self.need_restart = False
 
 
 class JournaldDeployer(Deployer):
     def configure(self):
-        journald_conf = files.put(
-            name="Configure journald",
-            src=get_resource("journald.conf"),
-            dest="/etc/systemd/journald.conf",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        self.need_restart = journald_conf.changed
+        self.put_file("journald.conf", "/etc/systemd/journald.conf")
 
     def activate(self):
-        systemd.service(
-            name="Start and enable journald",
-            service="systemd-journald.service",
-            running=True,
-            enabled=True,
-            restarted=self.need_restart,
-        )
-        self.need_restart = False
+        self.ensure_service("systemd-journald.service")
 
 
 class ChatmailVenvDeployer(Deployer):
@@ -459,14 +365,14 @@ class ChatmailVenvDeployer(Deployer):
         )
 
     def install(self):
-        _install_remote_venv_with_chatmaild()
+        _install_remote_venv_with_chatmaild(self)
 
     def configure(self):
-        _configure_remote_venv_with_chatmaild(self.config)
-        configure_remote_units(self.config.mail_domain, self.units)
+        _configure_remote_venv_with_chatmaild(self, self.config)
+        configure_remote_units(self, self.config.mail_domain_bare, self.units)
 
     def activate(self):
-        activate_remote_units(self.units)
+        activate_remote_units(self, self.units)
 
 
 class ChatmailDeployer(Deployer):
@@ -475,10 +381,15 @@ class ChatmailDeployer(Deployer):
         ("iroh", None, None),
     ]
 
-    def __init__(self, mail_domain):
-        self.mail_domain = mail_domain
+    def __init__(self, config):
+        self.config = config
+        self.mail_domain = config.mail_domain
 
     def install(self):
+        self.put_file(
+            src=BytesIO(b'APT::Install-Recommends "false";\n'),
+            dest="/etc/apt/apt.conf.d/00InstallRecommends",
+        )
         apt.update(name="apt update", cache_time=24 * 3600)
         apt.upgrade(name="upgrade apt packages", auto_remove=True)
 
@@ -491,12 +402,15 @@ class ChatmailDeployer(Deployer):
             name="Install rsync",
             packages=["rsync"],
         )
-        apt.packages(
-            name="Ensure cron is installed",
-            packages=["cron"],
-        )
 
     def configure(self):
+        # metadata crashes if the mailboxes dir does not exist
+        self.ensure_directory(
+            str(self.config.mailboxes_dir),
+            owner="vmail",
+            mode="700",
+        )
+
         # This file is used by auth proxy.
         # https://wiki.debian.org/EtcMailName
         server.shell(
@@ -515,12 +429,7 @@ class FcgiwrapDeployer(Deployer):
         )
 
     def activate(self):
-        systemd.service(
-            name="Start and enable fcgiwrap",
-            service="fcgiwrap.service",
-            running=True,
-            enabled=True,
-        )
+        self.ensure_service("fcgiwrap.service")
 
 
 class GithashDeployer(Deployer):
@@ -533,12 +442,7 @@ class GithashDeployer(Deployer):
             git_diff = subprocess.check_output(["git", "diff"]).decode()
         except Exception:
             git_diff = ""
-        files.put(
-            name="Upload chatmail relay git commit hash",
-            src=StringIO(git_hash + git_diff),
-            dest="/etc/chatmail-version",
-            mode="700",
-        )
+        self.put_file(src=StringIO(git_hash + git_diff), dest="/etc/chatmail-version")
 
 
 def get_tls_deployer(config, mail_domain):
@@ -564,29 +468,27 @@ def deploy_chatmail(config_path: Path, disable_mail: bool, website_only: bool) -
     """
     config = read_config(config_path)
     check_config(config)
-    mail_domain = config.mail_domain
+    bare_host = config.mail_domain_bare
 
     if website_only:
         Deployment().perform_stages([WebsiteDeployer(config)])
         return
 
-    if host.get_fact(Port, port=53) != "unbound":
-        files.line(
-            name="Add 9.9.9.9 to resolv.conf",
-            path="/etc/resolv.conf",
-            # Guard against resolv.conf missing a trailing newline (SolusVM bug).
-            line="\nnameserver 9.9.9.9",
-        )
-
     # Check if mtail_address interface is available (if configured)
-    if config.mtail_address and config.mtail_address not in ('127.0.0.1', '::1', 'localhost'):
+    if config.mtail_address and config.mtail_address not in (
+        "127.0.0.1",
+        "::1",
+        "localhost",
+    ):
         ipv4_addrs = host.get_fact(hardware.Ipv4Addrs)
         all_addresses = [addr for addrs in ipv4_addrs.values() for addr in addrs]
         if config.mtail_address not in all_addresses:
-            Out().red(f"Deploy failed: mtail_address {config.mtail_address} is not available (VPN up?).\n")
+            Out().red(
+                f"Deploy failed: mtail_address {config.mtail_address} is not available (VPN up?).\n"
+            )
             exit(1)
 
-    if not os.environ.get("CHATMAIL_NOPORTCHECK"):
+    if not is_in_container():
         port_services = [
             (["master", "smtpd"], 25),
             ("unbound", 53),
@@ -611,6 +513,8 @@ def deploy_chatmail(config_path: Path, disable_mail: bool, website_only: bool) -
             (["master", "smtpd"], config.postfix_reinject_port_incoming),
             ("filtermail", config.filtermail_smtp_port),
             ("filtermail", config.filtermail_smtp_port_incoming),
+            ("filtermail", config.filtermail_http_port_incoming),
+            ("filtermail", config.filtermail_lmtp_port_transport),
         ]
         for service, port in port_services:
             print(f"Checking if port {port} is available for {service}...")
@@ -623,21 +527,21 @@ def deploy_chatmail(config_path: Path, disable_mail: bool, website_only: bool) -
                     )
                     exit(1)
 
-    tls_deployer = get_tls_deployer(config, mail_domain)
+    tls_deployer = get_tls_deployer(config, bare_host)
 
     all_deployers = [
-        ChatmailDeployer(mail_domain),
+        ChatmailDeployer(config),
         LegacyRemoveDeployer(),
         FiltermailDeployer(),
         JournaldDeployer(),
         UnboundDeployer(config),
-        TurnDeployer(mail_domain),
+        TurnDeployer(bare_host),
         IrohDeployer(config.enable_iroh_relay),
         tls_deployer,
         WebsiteDeployer(config),
         ChatmailVenvDeployer(config),
         MtastsDeployer(),
-        OpendkimDeployer(mail_domain),
+        *([] if config.ipv4_relay else [OpendkimDeployer(bare_host)]),
         # Dovecot should be started before Postfix
         # because it creates authentication socket
         # required by Postfix.

cmdeploy/src/cmdeploy/dns.py

@@ -1,11 +1,22 @@
 import datetime
-import importlib
-
-from jinja2 import Template
 
 from . import remote
 
 
+def parse_zone_records(text):
+    """Yield ``(name, ttl, rtype, rdata)`` from standard BIND-format text."""
+    for raw_line in text.splitlines():
+        line = raw_line.strip()
+        if not line or line.startswith(";"):
+            continue
+        try:
+            name, ttl, _in, rtype, rdata = line.split(None, 4)
+        except ValueError:
+            raise ValueError(f"Bad zone record line: {line!r}") from None
+        name = name.rstrip(".")
+        yield name, ttl, rtype.upper(), rdata
+
+
 def get_initial_remote_data(sshexec, mail_domain):
     return sshexec.logged(
         call=remote.rdns.perform_initial_checks, kwargs=dict(mail_domain=mail_domain)
@@ -31,13 +42,39 @@ def get_filled_zone_file(remote_data):
     if not sts_id:
         remote_data["sts_id"] = datetime.datetime.now().strftime("%Y%m%d%H%M")
 
-    template = importlib.resources.files(__package__).joinpath("chatmail.zone.j2")
-    content = template.read_text()
-    zonefile = Template(content).render(**remote_data)
-    lines = [x.strip() for x in zonefile.split("\n") if x.strip()]
+    d = remote_data["mail_domain"]
+
+    def append_record(name, rtype, rdata, ttl=3600):
+        lines.append(f"{name:<40} {ttl:<6} IN  {rtype:<5}  {rdata}")
+
+    lines = ["; Required DNS entries"]
+    if remote_data.get("A"):
+        append_record(f"{d}.", "A", remote_data["A"])
+    if remote_data.get("AAAA"):
+        append_record(f"{d}.", "AAAA", remote_data["AAAA"])
+    append_record(f"{d}.", "MX", f"10 {d}.")
+    if remote_data.get("strict_tls"):
+        append_record(f"_mta-sts.{d}.", "TXT", f'"v=STSv1; id={remote_data["sts_id"]}"')
+        append_record(f"mta-sts.{d}.", "CNAME", f"{d}.")
+    append_record(f"www.{d}.", "CNAME", f"{d}.")
+    lines.append(remote_data["dkim_entry"])
     lines.append("")
-    zonefile = "\n".join(lines)
-    return zonefile
+    lines.append("; Recommended DNS entries")
+    append_record(f"{d}.", "TXT", '"v=spf1 a ~all"')
+    append_record(f"_dmarc.{d}.", "TXT", '"v=DMARC1;p=reject;adkim=s;aspf=s"')
+    if remote_data.get("acme_account_url"):
+        append_record(
+            f"{d}.",
+            "CAA",
+            f'0 issue "letsencrypt.org;accounturi={remote_data["acme_account_url"]}"',
+        )
+    append_record(f"_adsp._domainkey.{d}.", "TXT", '"dkim=discardable"')
+    append_record(f"_submission._tcp.{d}.", "SRV", f"0 1 587 {d}.")
+    append_record(f"_submissions._tcp.{d}.", "SRV", f"0 1 465 {d}.")
+    append_record(f"_imap._tcp.{d}.", "SRV", f"0 1 143 {d}.")
+    append_record(f"_imaps._tcp.{d}.", "SRV", f"0 1 993 {d}.")
+    lines.append("")
+    return "\n".join(lines)
 
 
 def check_full_zone(sshexec, remote_data, out, zonefile) -> int:
@@ -58,7 +95,8 @@ def check_full_zone(sshexec, remote_data, out, zonefile) -> int:
         returncode = 1
     if remote_data.get("dkim_entry") in required_diff:
         out(
-            "If the DKIM entry above does not work with your DNS provider, you can try this one:\n"
+            "If the DKIM entry above does not work with your DNS provider,"
+            " you can try this one:\n"
         )
         out(remote_data.get("web_dkim_entry") + "\n")
     if recommended_diff:

cmdeploy/src/cmdeploy/dovecot/deployer.py

@@ -1,20 +1,32 @@
-import os
+import io
 import urllib.request
 
 from chatmaild.config import Config
 from pyinfra import host
-from pyinfra.facts.server import Arch, Sysctl
-from pyinfra.facts.systemd import SystemdEnabled
-from pyinfra.operations import apt, files, server, systemd
+from pyinfra.facts.deb import DebPackages
+from pyinfra.facts.server import Arch, Command, Sysctl
+from pyinfra.operations import apt, files, server
 
 from cmdeploy.basedeploy import (
     Deployer,
     activate_remote_units,
+    blocked_service_startup,
     configure_remote_units,
-    get_resource,
-    has_systemd,
+    is_in_container,
 )
 
+DOVECOT_ARCHIVE_VERSION = "2.3.21+dfsg1-3"
+DOVECOT_PACKAGE_VERSION = f"1:{DOVECOT_ARCHIVE_VERSION}"
+
+DOVECOT_SHA256 = {
+    ("core", "amd64"): "dd060706f52a306fa863d874717210b9fe10536c824afe1790eec247ded5b27d",
+    ("core", "arm64"): "e7548e8a82929722e973629ecc40fcfa886894cef3db88f23535149e7f730dc9",
+    ("imapd", "amd64"): "8d8dc6fc00bbb6cdb25d345844f41ce2f1c53f764b79a838eb2a03103eebfa86",
+    ("imapd", "arm64"): "178fa877ddd5df9930e8308b518f4b07df10e759050725f8217a0c1fb3fd707f",
+    ("lmtpd", "amd64"): "2f69ba5e35363de50962d42cccbfe4ed8495265044e244007d7ccddad77513ab",
+    ("lmtpd", "arm64"): "89f52fb36524f5877a177dff4a713ba771fd3f91f22ed0af7238d495e143b38f",
+}
+
 
 class DovecotDeployer(Deployer):
     daemon_reload = False
@@ -26,30 +38,59 @@ class DovecotDeployer(Deployer):
 
     def install(self):
         arch = host.get_fact(Arch)
-        if has_systemd() and "dovecot.service" in host.get_fact(SystemdEnabled):
-            return  # already installed and running
-        _install_dovecot_package("core", arch)
-        _install_dovecot_package("imapd", arch)
-        _install_dovecot_package("lmtpd", arch)
+        with blocked_service_startup():
+            debs = []
+            for pkg in ("core", "imapd", "lmtpd"):
+                deb, changed = _download_dovecot_package(pkg, arch)
+                self.need_restart |= changed
+                if deb:
+                    debs.append(deb)
+            if debs:
+                deb_list = " ".join(debs)
+                # First dpkg may fail on missing dependencies (stderr suppressed);
+                # apt-get --fix-broken pulls them in, then dpkg retries cleanly.
+                server.shell(
+                    name="Install dovecot packages",
+                    commands=[
+                        f"dpkg --force-confdef --force-confold -i {deb_list} 2> /dev/null || true",
+                        "DEBIAN_FRONTEND=noninteractive apt-get -y --fix-broken install",
+                        f"dpkg --force-confdef --force-confold -i {deb_list}",
+                    ],
+                )
+                self.need_restart = True
+        self.put_file(
+            src=io.StringIO(
+                "Package: dovecot-*\n"
+                "Pin: version *\n"
+                "Pin-Priority: -1\n"
+            ),
+            dest="/etc/apt/preferences.d/pin-dovecot",
+        )
 
     def configure(self):
-        configure_remote_units(self.config.mail_domain, self.units)
-        self.need_restart, self.daemon_reload = _configure_dovecot(self.config)
+        configure_remote_units(self, self.config.mail_domain_bare, self.units)
+        _configure_dovecot(self, self.config)
 
     def activate(self):
-        activate_remote_units(self.units)
+        activate_remote_units(self, self.units)
 
-        restart = False if self.disable_mail else self.need_restart
+        # Detect stale binary: package installed but service still runs old (deleted) binary.
+        if not self.disable_mail and not self.need_restart:
+            stale = host.get_fact(
+                Command,
+                'pid=$(systemctl show -p MainPID --value dovecot.service 2>/dev/null);'
+                ' [ "${pid:-0}" != "0" ] && readlink "/proc/$pid/exe" 2>/dev/null | grep -q "(deleted)"'
+                " && echo STALE || true",
+            )
+            if stale == "STALE":
+                self.need_restart = True
 
-        systemd.service(
-            name="Disable dovecot for now" if self.disable_mail else "Start and enable Dovecot",
-            service="dovecot.service",
-            running=False if self.disable_mail else True,
-            enabled=False if self.disable_mail else True,
-            restarted=restart,
-            daemon_reload=self.daemon_reload,
+        active = not self.disable_mail
+        self.ensure_service(
+            "dovecot.service",
+            running=active,
+            enabled=active,
         )
-        self.need_restart = False
 
 
 def _pick_url(primary, fallback):
@@ -61,110 +102,88 @@ def _pick_url(primary, fallback):
         return fallback
 
 
-def _install_dovecot_package(package: str, arch: str):
+def _download_dovecot_package(package: str, arch: str) -> tuple[str | None, bool]:
+    """Download a dovecot .deb if needed, return (path, changed)."""
     arch = "amd64" if arch == "x86_64" else arch
     arch = "arm64" if arch == "aarch64" else arch
-    primary_url = f"https://download.delta.chat/dovecot/dovecot-{package}_2.3.21%2Bdfsg1-3_{arch}.deb"
-    fallback_url = f"https://github.com/chatmail/dovecot/releases/download/upstream%2F2.3.21%2Bdfsg1/dovecot-{package}_2.3.21%2Bdfsg1-3_{arch}.deb"
-    url = _pick_url(primary_url, fallback_url)
-    deb_filename = "/root/" + url.split("/")[-1]
 
-    match (package, arch):
-        case ("core", "amd64"):
-            sha256 = "dd060706f52a306fa863d874717210b9fe10536c824afe1790eec247ded5b27d"
-        case ("core", "arm64"):
-            sha256 = "e7548e8a82929722e973629ecc40fcfa886894cef3db88f23535149e7f730dc9"
-        case ("imapd", "amd64"):
-            sha256 = "8d8dc6fc00bbb6cdb25d345844f41ce2f1c53f764b79a838eb2a03103eebfa86"
-        case ("imapd", "arm64"):
-            sha256 = "178fa877ddd5df9930e8308b518f4b07df10e759050725f8217a0c1fb3fd707f"
-        case ("lmtpd", "amd64"):
-            sha256 = "2f69ba5e35363de50962d42cccbfe4ed8495265044e244007d7ccddad77513ab"
-        case ("lmtpd", "arm64"):
-            sha256 = "89f52fb36524f5877a177dff4a713ba771fd3f91f22ed0af7238d495e143b38f"
-        case _:
-            apt.packages(packages=[f"dovecot-{package}"])
-            return
+    pkg_name = f"dovecot-{package}"
+    sha256 = DOVECOT_SHA256.get((package, arch))
+    if sha256 is None:
+        op = apt.packages(packages=[pkg_name])
+        return None, bool(getattr(op, "changed", False))
+
+    installed_versions = host.get_fact(DebPackages).get(pkg_name, [])
+    if DOVECOT_PACKAGE_VERSION in installed_versions:
+        return None, False
+
+    url_version = DOVECOT_ARCHIVE_VERSION.replace("+", "%2B")
+    deb_base = f"{pkg_name}_{url_version}_{arch}.deb"
+    primary_url = f"https://download.delta.chat/dovecot/{deb_base}"
+    fallback_url = f"https://github.com/chatmail/dovecot/releases/download/upstream%2F{url_version}/{deb_base}"
+    url = _pick_url(primary_url, fallback_url)
+    deb_filename = f"/root/{deb_base}"
 
     files.download(
-        name=f"Download dovecot-{package}",
+        name=f"Download {pkg_name}",
         src=url,
         dest=deb_filename,
         sha256sum=sha256,
         cache_time=60 * 60 * 24 * 365 * 10,  # never redownload the package
     )
 
-    apt.deb(name=f"Install dovecot-{package}", src=deb_filename)
+    return deb_filename, True
 
-
-def _configure_dovecot(config: Config, debug: bool = False) -> (bool, bool):
+def _configure_dovecot(deployer, config: Config, debug: bool = False):
     """Configures Dovecot IMAP server."""
-    need_restart = False
-    daemon_reload = False
-
-    main_config = files.template(
-        src=get_resource("dovecot/dovecot.conf.j2"),
-        dest="/etc/dovecot/dovecot.conf",
-        user="root",
-        group="root",
-        mode="644",
+    deployer.put_template(
+        "dovecot/dovecot.conf.j2",
+        "/etc/dovecot/dovecot.conf",
         config=config,
         debug=debug,
         disable_ipv6=config.disable_ipv6,
     )
-    need_restart |= main_config.changed
-    auth_config = files.put(
-        src=get_resource("dovecot/auth.conf"),
-        dest="/etc/dovecot/auth.conf",
-        user="root",
-        group="root",
-        mode="644",
+    deployer.put_file("dovecot/auth.conf", "/etc/dovecot/auth.conf")
+    deployer.put_file(
+        "dovecot/push_notification.lua", "/etc/dovecot/push_notification.lua"
     )
-    need_restart |= auth_config.changed
-    lua_push_notification_script = files.put(
-        src=get_resource("dovecot/push_notification.lua"),
-        dest="/etc/dovecot/push_notification.lua",
-        user="root",
-        group="root",
-        mode="644",
-    )
-    need_restart |= lua_push_notification_script.changed
 
     # as per https://doc.dovecot.org/2.3/configuration_manual/os/
     # it is recommended to set the following inotify limits
-    if not os.environ.get("CHATMAIL_NOSYSCTL"):
-        for name in ("max_user_instances", "max_user_watches"):
-            key = f"fs.inotify.{name}"
-            if host.get_fact(Sysctl)[key] > 65535:
-                # Skip updating limits if already sufficient
-                # (enables running in incus containers where sysctl readonly)
-                continue
-            server.sysctl(
-                name=f"Change {key}",
-                key=key,
-                value=65535,
-                persist=True,
+    can_modify = not is_in_container()
+    for name in ("max_user_instances", "max_user_watches"):
+        key = f"fs.inotify.{name}"
+        value = host.get_fact(Sysctl).get(key, 0)
+        if value > 65534:
+            continue
+        if not can_modify:
+            print(
+                "\n!!!! refusing to attempt sysctl setting in containers\n"
+                f"!!!! dovecot: sysctl {key!r}={value}, should be >65534 for production setups\n"
+                "!!!!"
             )
+            continue
+        server.sysctl(
+            name=f"Change {key}",
+            key=key,
+            value=65535,
+            persist=True,
+        )
 
-    timezone_env = files.line(
+    deployer.ensure_line(
         name="Set TZ environment variable",
         path="/etc/environment",
         line="TZ=:/etc/localtime",
     )
-    need_restart |= timezone_env.changed
 
-    restart_conf = files.put(
-        name="dovecot: restart automatically on failure",
-        src=get_resource("service/10_restart.conf"),
-        dest="/etc/systemd/system/dovecot.service.d/10_restart.conf",
+    deployer.put_file(
+        "service/10_restart_on_failure.conf",
+        "/etc/systemd/system/dovecot.service.d/10_restart.conf",
     )
-    daemon_reload |= restart_conf.changed
 
     # Validate dovecot configuration before restart
-    if need_restart:
+    if deployer.need_restart:
         server.shell(
             name="Validate dovecot configuration",
             commands=["doveconf -n >/dev/null"],
         )
-
-    return need_restart, daemon_reload

cmdeploy/src/cmdeploy/dovecot/dovecot.conf.j2

@@ -7,6 +7,7 @@ listen = 0.0.0.0
 protocols = imap lmtp
 
 auth_mechanisms = plain
+auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@[]
 
 {% if debug == true %}
 auth_verbose = yes
@@ -133,6 +134,11 @@ protocol lmtp {
   # mail_lua and push_notification_lua are needed for Lua push notification handler.
   # <https://doc.dovecot.org/2.3/configuration_manual/push_notification/#configuration>
   mail_plugins = $mail_plugins mail_lua notify push_notification push_notification_lua
+
+  # Disable fsync for LMTP. May lose delivered message,
+  # but unlikely to cause problems with multiple relays.
+  # https://doc.dovecot.org/2.3/admin_manual/mailbox_formats/#fsyncing
+  mail_fsync = never
 }
 
 plugin {
@@ -144,12 +150,26 @@ plugin {
 }
 
 plugin {
-  # for now we define static quota-rules for all users 
   quota = maildir:User quota
-  quota_rule = *:storage={{ config.max_mailbox_size }}
   quota_max_mail_size={{ config.max_message_size }}
   quota_grace = 0
-  # quota_over_flag_value = TRUE
+
+  quota_rule = *:storage={{ config.max_mailbox_size_mb }}M
+
+  # Trigger at 75%% of quota, expire oldest messages down to 70%%.
+  # The percentages are chosen to prevent current Delta Chat users
+  # from seeing "quota warnings" which trigger at 80% and 95%.
+
+  quota_warning = storage=75%% quota-warning {{ config.max_mailbox_size_mb * 70 // 100 }} {{ config.mailboxes_dir }}/%u
+}
+
+service quota-warning {
+  executable = script /usr/local/lib/chatmaild/venv/bin/chatmail-quota-expire
+  user = vmail
+  unix_listener quota-warning {
+     user = vmail
+     mode = 0600
+  }
 }
 
 # push_notification configuration
@@ -252,6 +272,9 @@ protocol imap {
   # sort -sn <(sed 's/ / C: /' *.in) <(sed 's/ / S: /' cat *.out)
 
   rawlog_dir = %h 
+
+  # Disable fsync for IMAP. May lose IMAP changes like setting flags. 
+  mail_fsync = never
 } 
 {% endif %}
 

cmdeploy/src/cmdeploy/external/deployer.py

@@ -1,10 +1,7 @@
-import io
-
 from pyinfra import host
 from pyinfra.facts.files import File
-from pyinfra.operations import files, systemd
 
-from cmdeploy.basedeploy import Deployer, get_resource
+from ..basedeploy import Deployer
 
 
 class ExternalTlsDeployer(Deployer):
@@ -23,45 +20,22 @@ class ExternalTlsDeployer(Deployer):
     def configure(self):
         # Verify cert and key exist on the remote host using pyinfra facts.
         for path in (self.cert_path, self.key_path):
-            info = host.get_fact(File, path=path)
-            if info is None:
+            if host.get_fact(File, path=path) is None:
                 raise Exception(f"External TLS file not found on server: {path}")
 
-        # Deploy the .path unit (templated with the cert path).
-        # pkg=__package__ is required here because the resource files
-        # live in cmdeploy.external, not the default cmdeploy package.
-        source = get_resource("tls-cert-reload.path.f", pkg=__package__)
-        content = source.read_text().format(cert_path=self.cert_path).encode()
-
-        path_unit = files.put(
-            name="Upload tls-cert-reload.path",
-            src=io.BytesIO(content),
-            dest="/etc/systemd/system/tls-cert-reload.path",
-            user="root",
-            group="root",
-            mode="644",
+        self.ensure_systemd_unit(
+            "external/tls-cert-reload.path.j2",
+            cert_path=self.cert_path,
         )
-
-        service_unit = files.put(
-            name="Upload tls-cert-reload.service",
-            src=get_resource("tls-cert-reload.service", pkg=__package__),
-            dest="/etc/systemd/system/tls-cert-reload.service",
-            user="root",
-            group="root",
-            mode="644",
+        self.ensure_systemd_unit(
+            "external/tls-cert-reload.service",
         )
 
-        if path_unit.changed or service_unit.changed:
-            self.need_restart = True
-
     def activate(self):
-        systemd.service(
-            name="Enable tls-cert-reload path watcher",
-            service="tls-cert-reload.path",
-            running=True,
-            enabled=True,
-            restarted=self.need_restart,
-            daemon_reload=self.need_restart,
-        )
         # No explicit reload needed here: dovecot/nginx read the cert
         # on startup, and the .path watcher handles live changes.
+        self.ensure_service(
+            "tls-cert-reload.path",
+            running=True,
+            enabled=True,
+        )

cmdeploy/src/cmdeploy/external/tls-cert-reload.path.j2

@@ -9,7 +9,7 @@
 Description=Watch TLS certificate for changes
 
 [Path]
-PathChanged={cert_path}
+PathChanged={{ cert_path }}
 
 [Install]
 WantedBy=multi-user.target

cmdeploy/src/cmdeploy/filtermail/deployer.py

@@ -1,52 +1,40 @@
-from pyinfra import facts, host
-from pyinfra.operations import files, systemd
+import os
 
-from cmdeploy.basedeploy import Deployer, get_resource
+from pyinfra import facts, host
+
+from cmdeploy.basedeploy import Deployer
 
 
 class FiltermailDeployer(Deployer):
-    services = ["filtermail", "filtermail-incoming"]
+    services = ["filtermail", "filtermail-incoming", "filtermail-transport"]
     bin_path = "/usr/local/bin/filtermail"
     config_path = "/usr/local/lib/chatmaild/chatmail.ini"
 
-    def __init__(self):
-        self.need_restart = False
-
     def install(self):
+        local_bin = os.environ.get("CHATMAIL_FILTERMAIL_BINARY")
+        if local_bin:
+            self.put_executable(
+                src=local_bin,
+                dest=self.bin_path,
+            )
+            return
+
         arch = host.get_fact(facts.server.Arch)
-        url = f"https://github.com/chatmail/filtermail/releases/download/v0.5.2/filtermail-{arch}"
+        url = f"https://github.com/chatmail/filtermail/releases/download/v0.7.4/filtermail-{arch}"
         sha256sum = {
-            "x86_64": "ce24ca0075aa445510291d775fb3aea8f4411818c7b885ae51a0fe18c5f789ce",
-            "aarch64": "c5d783eefa5332db3d97a0e6a23917d72849e3eb45da3d16ce908a9b4e5a797d",
+            "x86_64": "484cb8dff083134aefba9fce4a6b7ef4784a0f0e28e5108ecf8bb9e58a44fd2c",
+            "aarch64": "66aa0ca2ca9add7a12d92883d76f8786384092adfde24a3d3a1d0b1f30d23a9e",
         }[arch]
-        self.need_restart |= files.download(
-            name="Download filtermail",
-            src=url,
-            sha256sum=sha256sum,
-            dest=self.bin_path,
-            mode="755",
-        ).changed
+        self.download_executable(url, self.bin_path, sha256sum)
 
     def configure(self):
         for service in self.services:
-            self.need_restart |= files.template(
-                src=get_resource(f"filtermail/{service}.service.j2"),
-                dest=f"/etc/systemd/system/{service}.service",
-                user="root",
-                group="root",
-                mode="644",
+            self.ensure_systemd_unit(
+                f"filtermail/{service}.service.j2",
                 bin_path=self.bin_path,
                 config_path=self.config_path,
-            ).changed
+            )
 
     def activate(self):
         for service in self.services:
-            systemd.service(
-                name=f"Start and enable {service}",
-                service=f"{service}.service",
-                running=True,
-                enabled=True,
-                restarted=self.need_restart,
-                daemon_reload=True,
-            )
-        self.need_restart = False
+            self.ensure_service(f"{service}.service")

cmdeploy/src/cmdeploy/filtermail/filtermail-transport.service.j2

@@ -0,0 +1,12 @@
+[Unit]
+Description=Chatmail transport service
+
+[Service]
+ExecStart={{ bin_path }} {{ config_path }} transport
+Restart=always
+RestartSec=30
+User=vmail
+LimitNOFILE=524288
+
+[Install]
+WantedBy=multi-user.target

cmdeploy/src/cmdeploy/metrics.cron.j2

@@ -1 +0,0 @@
-*/5 * * * * root {{ config.execpath }} {{ config.mailboxes_dir }} >/var/www/html/metrics

cmdeploy/src/cmdeploy/mtail/delivered_mail.mtail

@@ -73,8 +73,21 @@ counter incoming_unencrypted_mail_count
   filtered_incoming_mail_count++
 }
 
+counter incoming_mailer_daemon_mail_count
+/Incoming: Filtering mailer-daemon message from/ {
+  incoming_mailer_daemon_mail_count++
+  filtered_incoming_mail_count++
+}
 
 counter rejected_unencrypted_mail_count
 /Rejected unencrypted mail/ {
   rejected_unencrypted_mail_count++
 }
+
+counter quota_expire_runs
+counter quota_expire_removed_files
+
+/quota-expire: removed (?P<count>\d+) message\(s\)/ {
+  quota_expire_runs++
+  quota_expire_removed_files += $count
+}

cmdeploy/src/cmdeploy/mtail/deployer.py

@@ -1,10 +1,7 @@
 from pyinfra import facts, host
-from pyinfra.operations import apt, files, server, systemd
+from pyinfra.operations import apt
 
-from cmdeploy.basedeploy import (
-    Deployer,
-    get_resource,
-)
+from cmdeploy.basedeploy import Deployer
 
 
 class MtailDeployer(Deployer):
@@ -18,51 +15,30 @@ class MtailDeployer(Deployer):
         (url, sha256sum) = {
             "x86_64": (
                 "https://github.com/google/mtail/releases/download/v3.0.8/mtail_3.0.8_linux_amd64.tar.gz",
-                "123c2ee5f48c3eff12ebccee38befd2233d715da736000ccde49e3d5607724e4",
+                "d55cb601049c5e61eabab29998dbbcea95d480e5448544f9470337ba2eea882e",
             ),
             "aarch64": (
                 "https://github.com/google/mtail/releases/download/v3.0.8/mtail_3.0.8_linux_arm64.tar.gz",
-                "aa04811c0929b6754408676de520e050c45dddeb3401881888a092c9aea89cae",
+                "f748db8ad2a1e0b63684d4c8868cf6a373a20f7e6922e5ece601fff0ee00eb1a",
             ),
         }[host.get_fact(facts.server.Arch)]
-
-        server.shell(
-            name="Download mtail",
-            commands=[
-                f"(echo '{sha256sum} /usr/local/bin/mtail' | sha256sum -c) || (curl -L {url} | gunzip | tar -x -f - mtail -O >/usr/local/bin/mtail.new && mv /usr/local/bin/mtail.new /usr/local/bin/mtail)",
-                "chmod 755 /usr/local/bin/mtail",
-            ],
+        self.download_executable(
+            url,
+            "/usr/local/bin/mtail",
+            sha256sum,
+            extract="gunzip | tar -xf - mtail -O",
         )
 
     def configure(self):
         # Using our own systemd unit instead of `/usr/lib/systemd/system/mtail.service`.
         # This allows to read from journalctl instead of log files.
-        files.template(
-            src=get_resource("mtail/mtail.service.j2"),
-            dest="/etc/systemd/system/mtail.service",
-            user="root",
-            group="root",
-            mode="644",
+        self.ensure_systemd_unit(
+            "mtail/mtail.service.j2",
             address=self.mtail_address or "127.0.0.1",
             port=3903,
         )
-
-        mtail_conf = files.put(
-            name="Mtail configuration",
-            src=get_resource("mtail/delivered_mail.mtail"),
-            dest="/etc/mtail/delivered_mail.mtail",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        self.need_restart = mtail_conf.changed
+        self.put_file("mtail/delivered_mail.mtail", "/etc/mtail/delivered_mail.mtail")
 
     def activate(self):
-        systemd.service(
-            name="Start and enable mtail",
-            service="mtail.service",
-            running=bool(self.mtail_address),
-            enabled=bool(self.mtail_address),
-            restarted=self.need_restart,
-        )
-        self.need_restart = False
+        active = bool(self.mtail_address)
+        self.ensure_service("mtail.service", running=active, enabled=active)

cmdeploy/src/cmdeploy/mtail/filtermail.mtail

@@ -0,0 +1,101 @@
+# filtermail.mtail: filtermail process event counters
+
+#
+# Counters
+#
+
+# Connection errors in the transport path
+# Error::Io / Error::ConnectionFailed / Error::Tls: the reason string filtermail strips
+counter filtermail_transport_error_total by reason
+
+# Unexpected transport errors: DNS failure, HTTP error, config error.
+counter filtermail_transport_unexpected_total
+
+# Silent drops: inbound
+# "unencrypted" overlaps with rejected_unencrypted_mail_count in delivered_mail.mtail.
+counter filtermail_inbound_drop_total by reason
+
+# Silent drops: outbound
+# "unencrypted" overlaps with rejected_unencrypted_mail_count in delivered_mail.mtail;
+# "sender_disabled" and "all_recipients_disabled" are new.
+counter filtermail_outbound_drop_total by reason
+
+# Reinject failures
+counter filtermail_reinject_error_total by direction
+
+# SMTP-level connection errors (client dropped mid-session)
+counter filtermail_smtp_error_total by reason
+
+#
+# filtermail::transport
+#
+
+/filtermail\[\d+\]: \[WARN\s+filtermail::transport::worker\] Connection error relaying to mail server \S+: / {
+    /timed out/ {
+        filtermail_transport_error_total["connection_timeout"]++
+    } otherwise {
+    /Failed to connect to any of the following addresses/ {
+        filtermail_transport_error_total["connection_refused"]++
+    } otherwise {
+    /Connection refused/ {
+        filtermail_transport_error_total["connection_refused"]++
+    } otherwise {
+    /invalid certificate/ {
+        filtermail_transport_error_total["tls_cert_not_verified"]++
+    } otherwise {
+    /peer sent fatal alert|handshake/ {
+        filtermail_transport_error_total["tls_handshake"]++
+    } otherwise {
+    /close_notify|connection closed/ {
+        filtermail_transport_error_total["lost_connection"]++
+    } otherwise {
+        filtermail_transport_error_total["other"]++
+    }}}}}}}
+
+/filtermail\[\d+\]: \[WARN\s+filtermail::transport::worker\] Unexpected error while delivering/ {
+    filtermail_transport_unexpected_total++
+}
+
+#
+# filtermail::smtp_server
+#
+
+/filtermail(?:-incoming)?\[\d+\]: \[WARN\s+filtermail::smtp_server\] Unexpected EoF while receiving DATA/ {
+    filtermail_smtp_error_total["unexpected_eof"]++
+}
+
+/filtermail(?:-incoming)?\[\d+\]: \[WARN\s+filtermail::smtp_server\] Malformed DATA line without CRLF/ {
+    filtermail_smtp_error_total["malformed_data_line"]++
+}
+
+#
+# filtermail::outbound
+#
+
+/filtermail\[\d+\]: \[WARN\s+filtermail::outbound\] Rejected unencrypted mail/ {
+    filtermail_outbound_drop_total["unencrypted"]++
+}
+
+/filtermail\[\d+\]: \[WARN\s+filtermail::outbound\] Dropping mail; Sender .* is disabled/ {
+    filtermail_outbound_drop_total["sender_disabled"]++
+}
+
+/filtermail\[\d+\]: \[WARN\s+filtermail::outbound\] Dropping mail; All recipients disabled/ {
+    filtermail_outbound_drop_total["all_recipients_disabled"]++
+}
+
+/filtermail\[\d+\]: \[WARN\s+filtermail::outbound\] Failed to re.inject mail/ {
+    filtermail_reinject_error_total["outbound"]++
+}
+
+#
+# filtermail::inbound
+#
+
+/filtermail(?:-incoming)?\[\d+\]: \[WARN\s+filtermail::inbound\] Rejected unencrypted mail/ {
+    filtermail_inbound_drop_total["unencrypted"]++
+}
+
+/filtermail(?:-incoming)?\[\d+\]: \[WARN\s+filtermail::inbound\] Failed to re.inject mail/ {
+    filtermail_reinject_error_total["inbound"]++
+}

cmdeploy/src/cmdeploy/mtail/mtail.service.j2

@@ -1,10 +1,13 @@
 [Unit]
 Description=mtail
+After=network-online.target
+Wants=network-online.target
 
 [Service]
 Type=simple
 ExecStart=/bin/sh -c "journalctl -f -o short-iso -n 0 | /usr/local/bin/mtail --address={{ address }} --port={{ port }} --progs /etc/mtail --logtostderr --logs -"
 Restart=on-failure
+RestartSec=2s
 
 [Install]
 WantedBy=multi-user.target

cmdeploy/src/cmdeploy/nginx/deployer.py

@@ -1,5 +1,5 @@
 from chatmaild.config import Config
-from pyinfra.operations import apt, files, systemd
+from pyinfra.operations import apt
 
 from cmdeploy.basedeploy import (
     Deployer,
@@ -31,87 +31,50 @@ class NginxDeployer(Deployer):
         # For documentation about policy-rc.d, see:
         # https://people.debian.org/~hmh/invokerc.d-policyrc.d-specification.txt
         #
-        files.put(
-            src=get_resource("policy-rc.d"),
-            dest="/usr/sbin/policy-rc.d",
-            user="root",
-            group="root",
-            mode="755",
-        )
+        self.put_executable(src="policy-rc.d", dest="/usr/sbin/policy-rc.d")
 
         apt.packages(
             name="Install nginx",
             packages=["nginx", "libnginx-mod-stream"],
         )
 
-        files.file("/usr/sbin/policy-rc.d", present=False)
+        self.remove_file("/usr/sbin/policy-rc.d")
 
     def configure(self):
-        self.need_restart = _configure_nginx(self.config)
+        _configure_nginx(self, self.config)
 
     def activate(self):
-        systemd.service(
-            name="Start and enable nginx",
-            service="nginx.service",
-            running=True,
-            enabled=True,
-            restarted=self.need_restart,
-        )
-        self.need_restart = False
+        self.ensure_service("nginx.service")
 
 
-def _configure_nginx(config: Config, debug: bool = False) -> bool:
+def _configure_nginx(deployer, config: Config, debug: bool = False):
     """Configures nginx HTTP server."""
-    need_restart = False
 
-    main_config = files.template(
-        src=get_resource("nginx/nginx.conf.j2"),
-        dest="/etc/nginx/nginx.conf",
-        user="root",
-        group="root",
-        mode="644",
+    deployer.put_template(
+        "nginx/nginx.conf.j2",
+        "/etc/nginx/nginx.conf",
         config=config,
         disable_ipv6=config.disable_ipv6,
     )
-    need_restart |= main_config.changed
 
-    autoconfig = files.template(
-        src=get_resource("nginx/autoconfig.xml.j2"),
-        dest="/var/www/html/.well-known/autoconfig/mail/config-v1.1.xml",
-        user="root",
-        group="root",
-        mode="644",
+    deployer.put_template(
+        "nginx/autoconfig.xml.j2",
+        "/var/www/html/.well-known/autoconfig/mail/config-v1.1.xml",
         config=config,
     )
-    need_restart |= autoconfig.changed
 
-    mta_sts_config = files.template(
-        src=get_resource("nginx/mta-sts.txt.j2"),
-        dest="/var/www/html/.well-known/mta-sts.txt",
-        user="root",
-        group="root",
-        mode="644",
+    deployer.put_template(
+        "nginx/mta-sts.txt.j2",
+        "/var/www/html/.well-known/mta-sts.txt",
         config=config,
     )
-    need_restart |= mta_sts_config.changed
 
     # install CGI newemail script
     #
     cgi_dir = "/usr/lib/cgi-bin"
-    files.directory(
-        name=f"Ensure {cgi_dir} exists",
-        path=cgi_dir,
-        user="root",
-        group="root",
-    )
+    deployer.ensure_directory(cgi_dir)
 
-    files.put(
-        name="Upload cgi newemail.py script",
+    deployer.put_executable(
         src=get_resource("newemail.py", pkg="chatmaild").open("rb"),
         dest=f"{cgi_dir}/newemail.py",
-        user="root",
-        group="root",
-        mode="755",
     )
-
-    return need_restart

cmdeploy/src/cmdeploy/nginx/nginx.conf.j2

@@ -42,6 +42,9 @@ stream {
 }
 
 http {
+	# access_log setting is inherited by all server sections
+	access_log syslog:server=unix:/dev/log,facility=local7;
+
 {% if config.tls_cert_mode == "self" %}
 	limit_req_zone $binary_remote_addr zone=newaccount:10m rate=2r/s;
 {% endif %}
@@ -54,7 +57,7 @@ http {
 	include /etc/nginx/mime.types;
 	default_type application/octet-stream;
 
-	ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
+	ssl_protocols TLSv1.2 TLSv1.3;
 	ssl_prefer_server_ciphers on;
 	ssl_certificate {{ config.tls_cert_path }};
 	ssl_certificate_key {{ config.tls_key_path }};
@@ -69,9 +72,11 @@ http {
 
 		index index.html index.htm;
 
-		server_name {{ config.mail_domain }} www.{{ config.mail_domain }} mta-sts.{{ config.mail_domain }};
+		server_name {{ config.mail_domain }} mta-sts.{{ config.mail_domain }};
 
-		access_log syslog:server=unix:/dev/log,facility=local7;
+		location /mxdeliv {
+		    proxy_pass http://127.0.0.1:{{ config.filtermail_http_port_incoming }};
+		}
 
 		location / {
 			# First attempt to serve request as file, then
@@ -79,10 +84,6 @@ http {
 			try_files $uri $uri/ =404;
 		}
 
-		location /metrics {
-			default_type text/plain;
-		}
-
 		location /new {
 {% if config.tls_cert_mode != "self" %}
 			if ($request_method = GET) {
@@ -143,7 +144,6 @@ http {
 		listen 127.0.0.1:8443 ssl;
 		server_name www.{{ config.mail_domain }};
 		return 301 $scheme://{{ config.mail_domain }}$request_uri;
-		access_log syslog:server=unix:/dev/log,facility=local7;
 	}
 
 	server {

cmdeploy/src/cmdeploy/opendkim/deployer.py

@@ -4,9 +4,9 @@ Installs OpenDKIM
 
 from pyinfra import host
 from pyinfra.facts.files import File
-from pyinfra.operations import apt, files, server, systemd
+from pyinfra.operations import apt, files, server
 
-from cmdeploy.basedeploy import Deployer, get_resource
+from cmdeploy.basedeploy import Deployer
 
 
 class OpendkimDeployer(Deployer):
@@ -25,65 +25,39 @@ class OpendkimDeployer(Deployer):
         domain = self.mail_domain
         dkim_selector = "opendkim"
         """Configures OpenDKIM"""
-        need_restart = False
 
-        main_config = files.template(
-            src=get_resource("opendkim/opendkim.conf"),
-            dest="/etc/opendkim.conf",
-            user="root",
-            group="root",
-            mode="644",
+        self.put_template(
+            "opendkim/opendkim.conf",
+            "/etc/opendkim.conf",
             config={"domain_name": domain, "opendkim_selector": dkim_selector},
         )
-        need_restart |= main_config.changed
 
-        screen_script = files.file(
-            path="/etc/opendkim/screen.lua",
-            present=False,
-        )
-        need_restart |= screen_script.changed
+        self.remove_file("/etc/opendkim/screen.lua")
+        self.remove_file("/etc/opendkim/final.lua")
 
-        final_script = files.file(
-            path="/etc/opendkim/final.lua",
-            present=False,
-        )
-        need_restart |= final_script.changed
-
-        files.directory(
-            name="Add opendkim directory to /etc",
-            path="/etc/opendkim",
-            user="opendkim",
-            group="opendkim",
+        self.ensure_directory(
+            "/etc/opendkim",
+            owner="opendkim",
             mode="750",
-            present=True,
         )
 
-        keytable = files.template(
-            src=get_resource("opendkim/KeyTable"),
-            dest="/etc/dkimkeys/KeyTable",
-            user="opendkim",
-            group="opendkim",
-            mode="644",
+        self.put_template(
+            "opendkim/KeyTable",
+            "/etc/dkimkeys/KeyTable",
+            owner="opendkim",
             config={"domain_name": domain, "opendkim_selector": dkim_selector},
         )
-        need_restart |= keytable.changed
 
-        signing_table = files.template(
-            src=get_resource("opendkim/SigningTable"),
-            dest="/etc/dkimkeys/SigningTable",
-            user="opendkim",
-            group="opendkim",
-            mode="644",
+        self.put_template(
+            "opendkim/SigningTable",
+            "/etc/dkimkeys/SigningTable",
+            owner="opendkim",
             config={"domain_name": domain, "opendkim_selector": dkim_selector},
         )
-        need_restart |= signing_table.changed
-        files.directory(
-            name="Add opendkim socket directory to /var/spool/postfix",
-            path="/var/spool/postfix/opendkim",
-            user="opendkim",
-            group="opendkim",
+        self.ensure_directory(
+            "/var/spool/postfix/opendkim",
+            owner="opendkim",
             mode="750",
-            present=True,
         )
 
         if not host.get_fact(File, f"/etc/dkimkeys/{dkim_selector}.private"):
@@ -96,12 +70,10 @@ class OpendkimDeployer(Deployer):
                 _su_user="opendkim",
             )
 
-        service_file = files.put(
-            name="Configure opendkim to restart once a day",
-            src=get_resource("opendkim/systemd.conf"),
-            dest="/etc/systemd/system/opendkim.service.d/10-prevent-memory-leak.conf",
+        self.put_file(
+            "opendkim/systemd.conf",
+            "/etc/systemd/system/opendkim.service.d/10-prevent-memory-leak.conf",
         )
-        need_restart |= service_file.changed
 
         files.file(
             name="chown opendkim: /etc/dkimkeys/opendkim.private",
@@ -110,15 +82,5 @@ class OpendkimDeployer(Deployer):
             group="opendkim",
         )
 
-        self.need_restart = need_restart
-
     def activate(self):
-        systemd.service(
-            name="Start and enable OpenDKIM",
-            service="opendkim.service",
-            running=True,
-            enabled=True,
-            daemon_reload=self.need_restart,
-            restarted=self.need_restart,
-        )
-        self.need_restart = False
+        self.ensure_service("opendkim.service")

cmdeploy/src/cmdeploy/postfix/deployer.py

@@ -1,11 +1,10 @@
-from pyinfra.operations import apt, files, server, systemd
+from pyinfra.operations import apt, server
 
-from cmdeploy.basedeploy import Deployer, get_resource
+from cmdeploy.basedeploy import Deployer
 
 
 class PostfixDeployer(Deployer):
     required_users = [("postfix", None, ["opendkim"])]
-    daemon_reload = False
 
     def __init__(self, config, disable_mail):
         self.config = config
@@ -19,99 +18,58 @@ class PostfixDeployer(Deployer):
 
     def configure(self):
         config = self.config
-        need_restart = False
 
-        main_config = files.template(
-            src=get_resource("postfix/main.cf.j2"),
-            dest="/etc/postfix/main.cf",
-            user="root",
-            group="root",
-            mode="644",
+        self.put_template(
+            "postfix/main.cf.j2",
+            "/etc/postfix/main.cf",
             config=config,
             disable_ipv6=config.disable_ipv6,
         )
-        need_restart |= main_config.changed
 
-        master_config = files.template(
-            src=get_resource("postfix/master.cf.j2"),
-            dest="/etc/postfix/master.cf",
-            user="root",
-            group="root",
-            mode="644",
+        self.put_template(
+            "postfix/master.cf.j2",
+            "/etc/postfix/master.cf",
             debug=False,
             config=config,
         )
-        need_restart |= master_config.changed
 
-        header_cleanup = files.put(
-            src=get_resource("postfix/submission_header_cleanup"),
-            dest="/etc/postfix/submission_header_cleanup",
-            user="root",
-            group="root",
-            mode="644",
+        self.put_file(
+            "postfix/submission_header_cleanup",
+            "/etc/postfix/submission_header_cleanup",
         )
-        need_restart |= header_cleanup.changed
+        self.put_file("postfix/lmtp_header_cleanup", "/etc/postfix/lmtp_header_cleanup")
 
-        lmtp_header_cleanup = files.put(
-            src=get_resource("postfix/lmtp_header_cleanup"),
-            dest="/etc/postfix/lmtp_header_cleanup",
-            user="root",
-            group="root",
-            mode="644",
+        res = self.put_file(
+            "postfix/smtp_tls_policy_map", "/etc/postfix/smtp_tls_policy_map"
         )
-        need_restart |= lmtp_header_cleanup.changed
-
-        tls_policy_map = files.put(
-            name="Upload SMTP TLS Policy that accepts self-signed certificates for IP-only hosts",
-            src=get_resource("postfix/smtp_tls_policy_map"),
-            dest="/etc/postfix/smtp_tls_policy_map",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        need_restart |= tls_policy_map.changed
-        if tls_policy_map.changed:
+        tls_policy_changed = res.changed
+        if tls_policy_changed:
             server.shell(
                 commands=["postmap /etc/postfix/smtp_tls_policy_map"],
             )
 
         # Login map that 1:1 maps email address to login.
-        login_map = files.put(
-            src=get_resource("postfix/login_map"),
-            dest="/etc/postfix/login_map",
-            user="root",
-            group="root",
-            mode="644",
-        )
-        need_restart |= login_map.changed
+        self.put_file("postfix/login_map", "/etc/postfix/login_map")
 
-        restart_conf = files.put(
-            name="postfix: restart automatically on failure",
-            src=get_resource("service/10_restart.conf"),
-            dest="/etc/systemd/system/postfix@.service.d/10_restart.conf",
+        self.put_file(
+            "service/10_restart_on_failure.conf",
+            "/etc/systemd/system/postfix@.service.d/10_restart.conf",
         )
-        self.daemon_reload = restart_conf.changed
 
         # Validate postfix configuration before restart
-        if need_restart:
+        if self.need_restart:
             server.shell(
                 name="Validate postfix configuration",
                 # Extract stderr and quit with error if non-zero
-                commands=["""bash -c 'w=$(postconf 2>&1 >/dev/null); [[ -z "$w" ]] || { echo "$w"; false; }'"""],
+                commands=[
+                    """bash -c 'w=$(postconf 2>&1 >/dev/null); [[ -z "$w" ]] || { echo "$w"; false; }'"""
+                ],
             )
-        self.need_restart = need_restart
 
     def activate(self):
-        restart = False if self.disable_mail else self.need_restart
-
-        systemd.service(
-            name="disable postfix for now"
-            if self.disable_mail
-            else "Start and enable Postfix",
-            service="postfix.service",
-            running=False if self.disable_mail else True,
-            enabled=False if self.disable_mail else True,
-            restarted=restart,
-            daemon_reload=self.daemon_reload,
+        active = not self.disable_mail
+        self.ensure_service(
+            "postfix.service",
+            running=active,
+            enabled=active,
         )
-        self.need_restart = False

cmdeploy/src/cmdeploy/postfix/main.cf.j2

@@ -20,7 +20,7 @@ smtpd_tls_key_file={{ config.tls_key_path }}
 smtpd_tls_security_level=may
 
 smtp_tls_CApath=/etc/ssl/certs
-smtp_tls_security_level={{ "verify" if config.tls_cert_mode == "acme" else "encrypt" }}
+smtp_tls_security_level=verify
 # Send SNI extension when connecting to other servers.
 # <https://www.postfix.org/postconf.5.html#smtp_tls_servername>
 smtp_tls_servername = hostname
@@ -53,15 +53,19 @@ smtpd_tls_exclude_ciphers = aNULL, RC4, MD5, DES
 # See <https://www.postfix.org/FORWARD_SECRECY_README.html#server_fs>.
 tls_preempt_cipherlist = yes
 
-smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
-myhostname = {{ config.mail_domain }}
+# Reject by default, override per smtpd in master.cf
+smtpd_relay_restrictions = reject
+myhostname = {{ config.postfix_myhostname }}
 alias_maps = hash:/etc/aliases
 alias_database = hash:/etc/aliases
 
-# Postfix does not deliver mail for any domain by itself.
-# Primary domain is listed in `virtual_mailbox_domains` instead
-# and handed over to Dovecot.
-mydestination =
+# When postfix receives mail for $mydestination,
+# it hands it over to dovecot via $local_transport.
+# Note: IP literals must be handled via local delivery / mydestination.
+mydestination = {{ config.mail_domain }}
+local_transport = lmtp:unix:private/dovecot-lmtp
+# postfix doesn't check whether local users exist or not:
+local_recipient_maps =
 
 relayhost = 
 {% if disable_ipv6 %}
@@ -69,15 +73,6 @@ mynetworks = 127.0.0.0/8
 {% else %}
 mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
 {% endif %}
-{% if config.addr_v4 %}
-smtp_bind_address = {{ config.addr_v4 }}
-{% endif %}
-{% if config.addr_v6 %}
-smtp_bind_address6 = {{ config.addr_v6 }}
-{% endif %}
-{% if config.addr_v4 or config.addr_v6 %}
-smtp_bind_address_enforce = yes
-{% endif %}
 mailbox_size_limit = 0
 message_size_limit = {{config.max_message_size}}
 recipient_delimiter = +
@@ -88,10 +83,16 @@ inet_protocols = ipv4
 inet_protocols = all
 {% endif %}
 
-virtual_transport = lmtp:unix:private/dovecot-lmtp
-virtual_mailbox_domains = {{ config.mail_domain }}
 lmtp_header_checks = regexp:/etc/postfix/lmtp_header_cleanup
 
+# Do not apply header checks to MIME headers
+# and other headers that are actually part of the message body.
+# Reference:
+# <https://www.postfix.org/postconf.5.html#disable_mime_input_processing>
+# <https://www.postfix.org/header_checks.5.html>
+# <https://stump.io/blog/2020/11/29/a-little-gotcha-with-postfixs-header_checks/>
+disable_mime_input_processing = yes
+
 mua_client_restrictions = permit_sasl_authenticated, reject
 mua_sender_restrictions = reject_sender_login_mismatch, permit_sasl_authenticated, reject
 mua_helo_restrictions = permit_mynetworks, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, permit
@@ -102,3 +103,35 @@ smtpd_sender_login_maps = regexp:/etc/postfix/login_map
 # Do not lookup SMTP client hostnames to reduce delays
 # and avoid unnecessary DNS requests.
 smtpd_peername_lookup = no
+
+# Use filtermail-transport to relay messages.
+# We can't force postfix to split messages per destination,
+# when specifying a custom next-hop,
+# so instead this is handled in filtermail.
+# We use LMTP instead SMTP so we can communicate per-recipient errors back to postfix.
+default_transport = lmtp-filtermail:inet:[127.0.0.1]:{{ config.filtermail_lmtp_port_transport }}
+
+# All deliveries over lmtp-filtermail are treated
+# as having the same destination [127.0.0.1],
+# so it is not possible to limit per-destination concurrency here,
+# it is a job for filtermail-transport.
+# Total number of parallel deliveries is limited
+# by "maxproc" column in /etc/postfix/master.cf for lmtp-filtermail.
+# Settings below are to prevent Postfix queue manager
+# from limiting the number of LMTP connections to filtermail-transport.
+# Read <https://www.postfix.org/TUNING_README.html#rope> and
+# <https://www.postfix.org/SCHEDULER_README.html> for the details
+# of the Postfix algorithm that we effectively disable here.
+lmtp-filtermail_initial_destination_concurrency=10000
+lmtp-filtermail_destination_concurrency_limit=10000
+
+# Do not try to deliver messages for more than 2 days.
+maximal_queue_lifetime = 2d
+
+{% if not config.ipv4_relay %}
+# DKIM-sign locally generated mail (bounces, DSNs).
+# These bypass smtpd, so they need explicit milter configuration.
+non_smtpd_milters = unix:opendkim/opendkim.sock
+internal_mail_filter_classes = bounce
+milter_macro_daemon_name = ORIGINATING
+{% endif %}

cmdeploy/src/cmdeploy/postfix/master.cf.j2

@@ -17,6 +17,7 @@ smtp      inet  n       -       y       -       -       smtpd
   -o smtpd_tls_security_level=encrypt
   -o smtpd_tls_mandatory_protocols=>=TLSv1.2
   -o smtpd_proxy_filter=127.0.0.1:{{ config.filtermail_smtp_port_incoming }}
+  -o smtpd_relay_restrictions=reject_unauth_destination
 submission inet n       -       y       -       5000    smtpd
   -o syslog_name=postfix/submission
   -o smtpd_tls_security_level=encrypt
@@ -75,17 +76,19 @@ lmtp      unix  -       -       y       -       -       lmtp
 anvil     unix  -       -       y       -       1       anvil
 scache    unix  -       -       y       -       1       scache
 postlog   unix-dgram n  -       n       -       1       postlogd
-filter    unix -        n       n       -       -       lmtp
 # Local SMTP server for reinjecting outgoing filtered mail.
 127.0.0.1:{{ config.postfix_reinject_port }} inet  n       -       n       -       100      smtpd
   -o syslog_name=postfix/reinject
   -o milter_macro_daemon_name=ORIGINATING
-  -o smtpd_milters=unix:opendkim/opendkim.sock
   -o cleanup_service_name=authclean
+  -o smtpd_relay_restrictions=permit_mynetworks,reject
+{% if not config.ipv4_relay %}  -o smtpd_milters=unix:opendkim/opendkim.sock
+{% endif %}
 
 # Local SMTP server for reinjecting incoming filtered mail 
 127.0.0.1:{{ config.postfix_reinject_port_incoming }} inet  n       -       n       -       100      smtpd
   -o syslog_name=postfix/reinject_incoming
+  -o smtpd_relay_restrictions=reject_unauth_destination
 
 # Cleanup `Received` headers for authenticated mail
 # to avoid leaking client IP.
@@ -100,3 +103,16 @@ filter    unix -        n       n       -       -       lmtp
 # cannot send unprotected Subject.
 authclean unix  n       -       -       -       0       cleanup
   -o header_checks=regexp:/etc/postfix/submission_header_cleanup
+
+# Reducing `maxproc` here may result in a head of line blocking
+# when there are many messages sent to unreachable destinations
+# at the same time.
+# LMTP clients here talk to filtermail-transport.
+# LMTP has no pipelining,
+# so while filtermail-transport tries to deliver the message,
+# possibly waiting for a long connection timeout
+# or talking to a slow server, LMTP client cannot be reused.
+lmtp-filtermail unix  -       -       y       -       500       lmtp
+  -o syslog_name=postfix/lmtp-filtermail
+  -o lmtp_header_checks=
+  -o lmtp_tls_security_level=none

cmdeploy/src/cmdeploy/remote/rdns.py

@@ -53,31 +53,36 @@ def get_dkim_entry(mail_domain, pre_command, dkim_selector):
             print=log_progress,
         )
     except CalledProcessError:
-        return
+        return None, None
     dkim_value_raw = f"v=DKIM1;k=rsa;p={dkim_pubkey};s=email;t=s"
     dkim_value = '" "'.join(re.findall(".{1,255}", dkim_value_raw))
     web_dkim_value = "".join(re.findall(".{1,255}", dkim_value_raw))
+    name = f"{dkim_selector}._domainkey.{mail_domain}."
     return (
-        f'{dkim_selector}._domainkey.{mail_domain}. TXT "{dkim_value}"',
-        f'{dkim_selector}._domainkey.{mail_domain}. TXT "{web_dkim_value}"',
+        f'{name:<40} 3600   IN  TXT    "{dkim_value}"',
+        f'{name:<40} 3600   IN  TXT    "{web_dkim_value}"',
     )
 
 
-def query_dns(typ, domain):
-    # Get autoritative nameserver from the SOA record.
-    soa_answers = [
+def get_authoritative_ns(domain):
+    ns_replies = [
         x.split()
         for x in shell(
-            f"dig -r -q {domain} -t SOA +noall +authority +answer", print=log_progress
+            f"dig -r -q {domain} -t NS +noall +authority +answer", print=log_progress
         ).split("\n")
     ]
-    soa = [a for a in soa_answers if len(a) >= 3 and a[3] == "SOA"]
-    if not soa:
+    filtered_replies = [a for a in ns_replies if len(a) >= 5 and a[3] == "NS"]
+    if not filtered_replies:
         return
-    ns = soa[0][4]
+    return filtered_replies[0][4]
+
+
+def query_dns(typ, domain):
+    ns = get_authoritative_ns(domain)
 
     # Query authoritative nameserver directly to bypass DNS cache.
-    res = shell(f"dig @{ns} -r -q {domain} -t {typ} +short", print=log_progress)
+    direct_ns = f"@{ns}" if ns else ""
+    res = shell(f"dig {direct_ns} -r -q {domain} -t {typ} +short", print=log_progress)
     return next((line for line in res.split("\n") if not line.startswith(";")), "")
 
 
@@ -94,7 +99,7 @@ def check_zonefile(zonefile, verbose=True):
         if not zf_line.strip() or zf_line.startswith(";"):
             continue
         print(f"dns-checking {zf_line!r}") if verbose else log_progress("")
-        zf_domain, zf_typ, zf_value = zf_line.split(maxsplit=2)
+        zf_domain, _ttl, _in, zf_typ, zf_value = zf_line.split(None, 4)
         zf_domain = zf_domain.rstrip(".")
         zf_value = zf_value.strip()
         query_value = query_dns(zf_typ, zf_domain)

cmdeploy/src/cmdeploy/remote/rshell.py

@@ -40,5 +40,5 @@ def dovecot_recalc_quota(user):
     #
     for line in output.split("\n"):
         parts = line.split()
-        if parts[2] == "STORAGE":
+        if len(parts) >= 6 and parts[2] == "STORAGE":
             return dict(value=int(parts[3]), limit=int(parts[4]), percent=int(parts[5]))

cmdeploy/src/cmdeploy/selfsigned/deployer.py

@@ -1,8 +1,8 @@
 import shlex
 
-from pyinfra.operations import apt, server
+from pyinfra.operations import server
 
-from cmdeploy.basedeploy import Deployer
+from ..basedeploy import Deployer
 
 
 def openssl_selfsigned_args(domain, cert_path, key_path, days=36500):
@@ -18,6 +18,8 @@ def openssl_selfsigned_args(domain, cert_path, key_path, days=36500):
         "-keyout", str(key_path),
         "-out", str(cert_path),
         "-subj", f"/CN={domain}",
+        # Mark as end-entity cert so it cannot be used as a CA to sign others.
+        "-addext", "basicConstraints=critical,CA:FALSE",
         "-addext", "extendedKeyUsage=serverAuth,clientAuth",
         "-addext",
         f"subjectAltName=DNS:{domain},DNS:www.{domain},DNS:mta-sts.{domain}",
@@ -32,11 +34,7 @@ class SelfSignedTlsDeployer(Deployer):
         self.cert_path = "/etc/ssl/certs/mailserver.pem"
         self.key_path = "/etc/ssl/private/mailserver.key"
 
-    def install(self):
-        apt.packages(
-            name="Install openssl",
-            packages=["openssl"],
-        )
+
 
     def configure(self):
         args = openssl_selfsigned_args(
@@ -50,3 +48,5 @@ class SelfSignedTlsDeployer(Deployer):
 
     def activate(self):
         pass
+
+

cmdeploy/src/cmdeploy/sshexec.py

@@ -50,9 +50,6 @@ class SSHExec:
     FuncError = FuncError
 
     def __init__(self, host, verbose=False, python="python3", timeout=60):
-        docker_container = os.environ.get("CHATMAIL_DOCKER")
-        if docker_container:
-            python = f"docker exec -i {docker_container} python3"
         self.gateway = execnet.makegateway(f"ssh=root@{host}//python={python}")
         self._remote_cmdloop_channel = bootstrap_remote(self.gateway, remote)
         self.timeout = timeout

cmdeploy/src/cmdeploy/tests/data/zftest.zone

@@ -1,17 +1,18 @@
-; Required DNS entries for chatmail servers
-zftest.testrun.org.                   A     135.181.204.127
-zftest.testrun.org.                   AAAA  2a01:4f9:c012:52f4::1
-zftest.testrun.org.                   MX 10 zftest.testrun.org.
-_mta-sts.zftest.testrun.org.          TXT "v=STSv1; id=202403211706"
-mta-sts.zftest.testrun.org.           CNAME zftest.testrun.org.
-www.zftest.testrun.org.               CNAME zftest.testrun.org.
-opendkim._domainkey.zftest.testrun.org. TXT "v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoYt82CVUyz2ouaqjX2kB+5J80knAyoOU3MGU5aWppmwUwwTvj/oSTSpkc5JMtVTRmKKr8NUDWAL1Yw7dfGqqPHdHfwwjS3BIvDzYx+hzgtz62RnfNgV+/2MAoNpfX7cAFIHdRzEHNtwugc3RDLquqPoupAE3Y2YRw2T5zG5fILh4vwIcJZL5Uq6B92j8wwJqOex" "33n+vm1NKQ9rxo/UsHAmZlJzpooXcG/4igTBxJyJlamVSRR6N7Nul1v//YJb7J6v2o0iPHW6uE0StzKaPPNC2IVosSRFbD9H2oqppltptFSNPlI0E+t0JBWHem6YK7xcugiO3ImMCaaU8g6Jt/wIDAQAB;s=email;t=s"
+; Required DNS entries
+zftest.testrun.org.                      3600   IN  A      135.181.204.127
+zftest.testrun.org.                      3600   IN  AAAA   2a01:4f9:c012:52f4::1
+zftest.testrun.org.                      3600   IN  MX     10 zftest.testrun.org.
+_mta-sts.zftest.testrun.org.             3600   IN  TXT    "v=STSv1; id=202403211706"
+mta-sts.zftest.testrun.org.              3600   IN  CNAME  zftest.testrun.org.
+www.zftest.testrun.org.                  3600   IN  CNAME  zftest.testrun.org.
+opendkim._domainkey.zftest.testrun.org.  3600   IN  TXT    "v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoYt82CVUyz2ouaqjX2kB+5J80knAyoOU3MGU5aWppmwUwwTvj/oSTSpkc5JMtVTRmKKr8NUDWAL1Yw7dfGqqPHdHfwwjS3BIvDzYx+hzgtz62RnfNgV+/2MAoNpfX7cAFIHdRzEHNtwugc3RDLquqPoupAE3Y2YRw2T5zG5fILh4vwIcJZL5Uq6B92j8wwJqOex" "33n+vm1NKQ9rxo/UsHAmZlJzpooXcG/4igTBxJyJlamVSRR6N7Nul1v//YJb7J6v2o0iPHW6uE0StzKaPPNC2IVosSRFbD9H2oqppltptFSNPlI0E+t0JBWHem6YK7xcugiO3ImMCaaU8g6Jt/wIDAQAB;s=email;t=s"
+
 ; Recommended DNS entries
-_submission._tcp.zftest.testrun.org.  SRV 0 1 587 zftest.testrun.org.
-_submissions._tcp.zftest.testrun.org. SRV 0 1 465 zftest.testrun.org.
-_imap._tcp.zftest.testrun.org.        SRV 0 1 143 zftest.testrun.org.
-_imaps._tcp.zftest.testrun.org.       SRV 0 1 993 zftest.testrun.org.
-zftest.testrun.org.                   CAA 0 issue "letsencrypt.org;accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/1371472956"
-zftest.testrun.org.                   TXT "v=spf1 a:zftest.testrun.org ~all"
-_dmarc.zftest.testrun.org.            TXT "v=DMARC1;p=reject;adkim=s;aspf=s"
-_adsp._domainkey.zftest.testrun.org.  TXT "dkim=discardable"
+zftest.testrun.org.                      3600   IN  TXT    "v=spf1 a ~all"
+_dmarc.zftest.testrun.org.               3600   IN  TXT    "v=DMARC1;p=reject;adkim=s;aspf=s"
+zftest.testrun.org.                      3600   IN  CAA    0 issue "letsencrypt.org;accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/1371472956"
+_adsp._domainkey.zftest.testrun.org.     3600   IN  TXT    "dkim=discardable"
+_submission._tcp.zftest.testrun.org.     3600   IN  SRV    0 1 587 zftest.testrun.org.
+_submissions._tcp.zftest.testrun.org.    3600   IN  SRV    0 1 465 zftest.testrun.org.
+_imap._tcp.zftest.testrun.org.           3600   IN  SRV    0 1 143 zftest.testrun.org.
+_imaps._tcp.zftest.testrun.org.          3600   IN  SRV    0 1 993 zftest.testrun.org.

cmdeploy/src/cmdeploy/tests/online/benchmark.py

@@ -1,4 +1,3 @@
-import time
 def test_tls_imap(benchmark, imap):
     def imap_connect():
         imap.connect()

cmdeploy/src/cmdeploy/tests/online/test_0_login.py

@@ -12,7 +12,7 @@ def test_init(tmp_path, maildomain):
     inipath = tmp_path.joinpath("chatmail.ini")
     main(["init", "--config", str(inipath), maildomain])
     config = read_config(inipath)
-    assert config.mail_domain == maildomain
+    assert config.mail_domain_bare == maildomain
 
 
 def test_capabilities(imap):
@@ -89,16 +89,17 @@ def test_concurrent_logins_same_account(
         assert login_results.get()
 
 
-def test_no_vrfy(chatmail_config):
-    domain = chatmail_config.mail_domain
+def test_no_vrfy(cmfactory, chatmail_config, maildomain):
+    ac = cmfactory.get_online_account()
+    addr = ac.get_config("addr")
 
-    s = smtplib.SMTP(domain)
+    s = smtplib.SMTP(maildomain)
     s.starttls()
 
     s.putcmd("vrfy", f"wrongaddress@{chatmail_config.mail_domain}")
     result = s.getreply()
     print(result)
-    s.putcmd("vrfy", f"echo@{chatmail_config.mail_domain}")
+    s.putcmd("vrfy", addr)
     result2 = s.getreply()
     print(result2)
     assert result[0] == result2[0] == 252

cmdeploy/src/cmdeploy/tests/online/test_1_basic.py

@@ -5,6 +5,7 @@ import subprocess
 import time
 
 import pytest
+from chatmaild.config import is_valid_ipv4
 
 from cmdeploy import remote
 from cmdeploy.cmdeploy import get_sshexec
@@ -21,6 +22,8 @@ class TestSSHExecutor:
         assert out == out2
 
     def test_perform_initial(self, sshexec, maildomain):
+        if is_valid_ipv4(maildomain):
+            pytest.skip(f"{maildomain} is not a domain")
         res = sshexec(
             remote.rdns.perform_initial_checks, kwargs=dict(mail_domain=maildomain)
         )
@@ -61,8 +64,10 @@ class TestSSHExecutor:
         else:
             pytest.fail("didn't raise exception")
 
-    def test_opendkim_restarted(self, sshexec):
+    def test_opendkim_restarted(self, sshexec, maildomain):
         """check that opendkim is not running for longer than a day."""
+        if is_valid_ipv4(maildomain):
+            pytest.skip(f"{maildomain} is an IPv4 relay, opendkim is not installed")
         cmd = "systemctl show opendkim --timestamp=utc --property=ActiveEnterTimestamp"
         out = sshexec(call=remote.rshell.shell, kwargs=dict(command=cmd))
         datestring = out.split("=")[1]
@@ -71,6 +76,44 @@ class TestSSHExecutor:
         assert (now - since_date).total_seconds() < 60 * 60 * 51
 
 
+def test_dovecot_main_process_matches_installed_binary(sshdomain):
+    sshexec = get_sshexec(sshdomain)
+    main_pid = int(
+        sshexec(
+            call=remote.rshell.shell,
+            kwargs=dict(
+                command="timeout 10 systemctl show -p MainPID --value dovecot.service"
+            ),
+        ).strip()
+    )
+    assert main_pid != 0, "dovecot.service MainPID is 0 -- service not running?"
+
+    exe = sshexec(
+        call=remote.rshell.shell,
+        kwargs=dict(command=f"timeout 10 readlink /proc/{main_pid}/exe"),
+    ).strip()
+    status_text = sshexec(
+        call=remote.rshell.shell,
+        kwargs=dict(
+            command="timeout 10 systemctl show -p StatusText --value dovecot.service"
+        ),
+    ).strip()
+    installed_version = sshexec(
+        call=remote.rshell.shell, kwargs=dict(command="timeout 10 dovecot --version")
+    ).strip()
+
+    assert not exe.endswith("(deleted)"), (
+        f"running dovecot binary was deleted (stale after upgrade): {exe}"
+    )
+    expected_status_text = f"v{installed_version}"
+    assert status_text == expected_status_text or status_text.startswith(
+        f"{expected_status_text} "
+    ), (
+        f"dovecot status version mismatch: "
+        f"StatusText={status_text!r}, installed={installed_version!r}"
+    )
+
+
 def test_timezone_env(remote):
     for line in remote.iter_output("env"):
         print(line)
@@ -151,6 +194,34 @@ def test_reject_missing_dkim(cmsetup, maildata, from_addr):
             s.sendmail(from_addr=from_addr, to_addrs=recipient.addr, msg=msg)
 
 
+def test_bounces_are_dkim_signed(cmsetup, cmsetup2, maildata, maildomain):
+    # we send a message to non-existant user and expect a bounce message
+    # which will only get through if the bounce message was DKIM-signed
+
+    if is_valid_ipv4(maildomain):
+        pytest.skip("DKIM is not configured on IPv4-only relays")
+
+    sender = cmsetup2.gen_users(1)[0]
+    nonexistent = f"nosuchuser_test42@{cmsetup.maildomain}"
+
+    msg = maildata(
+        "encrypted.eml",
+        from_addr=sender.addr,
+        to_addr=nonexistent,
+    ).as_string()
+    sender.smtp.sendmail(sender.addr, [nonexistent], msg)
+
+    def bounce_in_inbox():
+        messages = sender.imap.fetch_all_messages()
+        for m in messages:
+            if "mail delivery" in m.lower() or "undelivered" in m.lower():
+                return m
+        raise ValueError("bounce not yet in inbox")
+
+    bounce = try_n_times(30, bounce_in_inbox)
+    assert "nosuchuser_test42" in bounce
+
+
 def try_n_times(n, f):
     for _ in range(n - 1):
         try:
@@ -183,7 +254,6 @@ def test_rewrite_subject(cmsetup, maildata):
     assert "Subject: Unencrypted subject" not in rcvd_msg
 
 
-@pytest.mark.slow
 def test_exceed_rate_limit(cmsetup, gencreds, maildata, chatmail_config):
     """Test that the per-account send-mail limit is exceeded."""
     user1, user2 = cmsetup.gen_users(2)
@@ -206,7 +276,6 @@ def test_exceed_rate_limit(cmsetup, gencreds, maildata, chatmail_config):
     pytest.fail("Rate limit was not exceeded")
 
 
-@pytest.mark.slow
 def test_expunged(remote, chatmail_config):
     outdated_days = int(chatmail_config.delete_mails_after) + 1
     find_cmds = [
@@ -245,3 +314,15 @@ def test_deployed_state(remote):
     # assert len(git_status) == len(remote_version)  # for some reason, we only get 11 lines from remote.iter_output()
     for i in range(len(remote_version)):
         assert git_status[i] == remote_version[i], "You have undeployed changes."
+
+
+def test_nginx_access_log_only_defined_once(sshdomain):
+    sshexec = get_sshexec(sshdomain)
+    conf = sshexec(
+        call=remote.rshell.shell,
+        kwargs=dict(command="nginx -T 2>/dev/null"),
+    )
+    access_logs = [l for l in conf.splitlines() if l.strip().startswith("access_log")]
+    assert len(access_logs) == 1, (
+        f"expected 1 access_log, found {len(access_logs)}: {access_logs}"
+    )

cmdeploy/src/cmdeploy/tests/online/test_2_deltachat.py

@@ -6,8 +6,8 @@ import imap_tools
 import pytest
 import requests
 
-from cmdeploy.remote import rshell
 from cmdeploy.cmdeploy import get_sshexec
+from cmdeploy.remote import rshell
 
 
 @pytest.fixture
@@ -15,7 +15,7 @@ def imap_mailbox(cmfactory, ssl_context):
     (ac1,) = cmfactory.get_online_accounts(1)
     user = ac1.get_config("addr")
     password = ac1.get_config("mail_pw")
-    host = user.split("@")[1]
+    host = user.split("@")[1].strip("[").strip("]")
     mailbox = imap_tools.MailBox(host, ssl_context=ssl_context)
     mailbox.login(user, password)
     mailbox.dc_ac = ac1
@@ -178,7 +178,7 @@ def test_hide_senders_ip_address(cmfactory, ssl_context):
     chat.send_text("testing submission header cleanup")
     user2.wait_for_incoming_msg()
     addr = user2.get_config("addr")
-    host = addr.split("@")[1]
+    host = addr.split("@")[1].strip("[").strip("]")
     pw = user2.get_config("mail_pw")
     mailbox = imap_tools.MailBox(host, ssl_context=ssl_context)
     mailbox.login(addr, pw)

cmdeploy/src/cmdeploy/tests/plugin.py

@@ -9,17 +9,18 @@ import time
 from pathlib import Path
 
 import pytest
-from chatmaild.config import read_config
+from chatmaild.config import is_valid_ipv4, read_config
+
+
+def format_mail_domain(raw_domain: str) -> str:
+    if is_valid_ipv4(raw_domain):
+        return f"[{raw_domain}]"
+    return raw_domain
+
 
 conftestdir = Path(__file__).parent
 
 
-def pytest_addoption(parser):
-    parser.addoption(
-        "--slow", action="store_true", default=False, help="also run slow tests"
-    )
-
-
 def pytest_configure(config):
     config._benchresults = {}
     config.addinivalue_line(
@@ -27,14 +28,12 @@ def pytest_configure(config):
     )
 
 
-def pytest_runtest_setup(item):
-    markers = list(item.iter_markers(name="slow"))
-    if markers:
-        if not item.config.getoption("--slow"):
-            pytest.skip("skipping slow test, use --slow to run")
-
-
 def _get_chatmail_config():
+    inipath = os.environ.get("CHATMAIL_INI")
+    if inipath:
+        path = Path(inipath).resolve()
+        return read_config(path), path
+
     current = Path().resolve()
     while 1:
         path = current.joinpath("chatmail.ini").resolve()
@@ -57,7 +56,7 @@ def chatmail_config(pytestconfig):
 
 @pytest.fixture(scope="session")
 def maildomain(chatmail_config):
-    return chatmail_config.mail_domain
+    return chatmail_config.mail_domain_bare
 
 
 @pytest.fixture(scope="session")
@@ -315,7 +314,8 @@ class ChatmailACFactory:
 
     def _make_transport(self, domain):
         """Build a transport config dict for the given domain."""
-        addr, password = self.gencreds(domain)
+        domain_deliverable = format_mail_domain(domain)
+        addr, password = self.gencreds(domain_deliverable)
         transport = {
             "addr": addr,
             "password": password,
@@ -324,7 +324,7 @@ class ChatmailACFactory:
             "imapServer": domain,
             "smtpServer": domain,
         }
-        if self.chatmail_config.tls_cert_mode == "self":
+        if domain.startswith("_") or is_valid_ipv4(domain):
             transport["certificateChecks"] = "acceptInvalidCertificates"
         return transport
 
@@ -339,14 +339,28 @@ class ChatmailACFactory:
         accounts = []
         for _ in range(num):
             account = self.dc.add_account()
-            future = account.add_or_update_transport.future(
-                self._make_transport(domain)
-            )
+            domain_deliverable = format_mail_domain(domain)
+            addr, password = self.gencreds(domain_deliverable)
+            if is_valid_ipv4(domain):
+                # Use DCLOGIN scheme with explicit server hosts,
+                # matching how madmail presents its addresses to users.
+                qr = (
+                    f"dclogin:{addr}"
+                    f"?p={password}&v=1"
+                    f"&ih={domain}&ip=993&is=ssl"
+                    f"&sh={domain}&sp=465&ss=ssl"
+                    f"&ic=3"
+                )
+                future = account.add_transport_from_qr.future(qr)
+            else:
+                future = account.add_or_update_transport.future(
+                    self._make_transport(domain)
+                )
             futures.append(future)
 
             # ensure messages stay in INBOX so that they can be
             # concurrently fetched via extra IMAP connections during tests
-            account.set_config("delete_server_after", "10")
+            account.set_config("bcc_self", "1")
             accounts.append(account)
 
         for future in futures:
@@ -388,37 +402,50 @@ def cmfactory(rpc, gencreds, maildomain, chatmail_config):
 
 @pytest.fixture
 def remote(sshdomain):
-    return Remote(sshdomain)
+    r = Remote(sshdomain)
+    yield r
+    r.close()
 
 
 class Remote:
     def __init__(self, sshdomain):
         self.sshdomain = sshdomain
+        self._procs = []
 
     def iter_output(self, logcmd="", ready=None):
         getjournal = "journalctl -f" if not logcmd else logcmd
         print(self.sshdomain)
-        match self.sshdomain:
-            case "@local": command = []
-            case "localhost": command = []
-            case _: command = ["ssh", f"root@{self.sshdomain}"]
-        docker_container = os.environ.get("CHATMAIL_DOCKER")
-        if docker_container:
-            command += ["docker", "exec", docker_container]
+        if self.sshdomain in ("@local", "localhost"):
+            command = []
+        else:
+            command = ["ssh", f"root@{self.sshdomain}"]
         [command.append(arg) for arg in getjournal.split()]
-        self.popen = subprocess.Popen(
+        popen = subprocess.Popen(
             command,
+            stdin=subprocess.DEVNULL,
             stdout=subprocess.PIPE,
+            stderr=subprocess.DEVNULL,
         )
-        while 1:
-            line = self.popen.stdout.readline()
-            res = line.decode().strip().lower()
-            if not res:
-                break
-            if ready is not None:
-                ready()
-                ready = None
-            yield res
+        self._procs.append(popen)
+        try:
+            while 1:
+                line = popen.stdout.readline()
+                res = line.decode().strip().lower()
+                if not res:
+                    break
+                if ready is not None:
+                    ready()
+                    ready = None
+                yield res
+        finally:
+            popen.terminate()
+            popen.wait()
+
+    def close(self):
+        while self._procs:
+            proc = self._procs.pop()
+            proc.kill()
+            proc.wait()
 
 
 @pytest.fixture
@@ -438,6 +465,11 @@ def cmsetup(maildomain, gencreds, ssl_context):
     return CMSetup(maildomain, gencreds, ssl_context)
 
 
+@pytest.fixture
+def cmsetup2(maildomain2, gencreds, ssl_context):
+    return CMSetup(maildomain2, gencreds, ssl_context)
+
+
 class CMSetup:
     def __init__(self, maildomain, gencreds, ssl_context):
         self.maildomain = maildomain
@@ -448,7 +480,7 @@ class CMSetup:
         print(f"Creating {num} online users")
         users = []
         for i in range(num):
-            addr, password = self.gencreds()
+            addr, password = self.gencreds(format_mail_domain(self.maildomain))
             user = CMUser(self.maildomain, addr, password, self.ssl_context)
             assert user.smtp
             users.append(user)

cmdeploy/src/cmdeploy/tests/test_basedeploy.py

@@ -0,0 +1,118 @@
+from unittest.mock import MagicMock, patch
+
+from cmdeploy.basedeploy import Deployer
+
+
+def test_put_file_restart_and_reload():
+    deployer = Deployer()
+    mock_res = MagicMock()
+    mock_res.changed = True
+
+    with patch("cmdeploy.basedeploy.files.put", return_value=mock_res):
+        deployer.put_file("foo.conf", "/etc/foo.conf")
+        assert deployer.need_restart is True
+        assert deployer.daemon_reload is False
+
+        deployer = Deployer()
+
+        deployer.put_file("test.service", "/etc/systemd/system/test.service")
+        assert deployer.need_restart is True
+        assert deployer.daemon_reload is True
+
+
+def test_remove_file():
+    deployer = Deployer()
+    mock_res = MagicMock()
+    mock_res.changed = True
+
+    with patch("cmdeploy.basedeploy.files.file", return_value=mock_res) as mock_file:
+        deployer.remove_file("/etc/foo.conf")
+        mock_file.assert_called_once_with(
+            name="Remove /etc/foo.conf", path="/etc/foo.conf", present=False
+        )
+        assert deployer.need_restart is True
+
+
+def test_ensure_systemd_unit():
+    deployer = Deployer()
+    mock_res = MagicMock()
+    mock_res.changed = True
+
+    # Plain service file
+    with patch("cmdeploy.basedeploy.files.put", return_value=mock_res) as mock_put:
+        deployer.ensure_systemd_unit("iroh-relay.service")
+        assert (
+            mock_put.call_args.kwargs["dest"]
+            == "/etc/systemd/system/iroh-relay.service"
+        )
+        assert deployer.need_restart is True
+        assert deployer.daemon_reload is True
+
+    deployer = Deployer()
+
+    # Template (.j2) dispatches to put_template and strips .j2 suffix
+    with patch("cmdeploy.basedeploy.files.template", return_value=mock_res) as mock_tpl:
+        deployer.ensure_systemd_unit(
+            "filtermail/chatmaild.service.j2",
+            bin_path="/usr/local/bin/filtermail",
+        )
+        assert (
+            mock_tpl.call_args.kwargs["dest"] == "/etc/systemd/system/chatmaild.service"
+        )
+
+    deployer = Deployer()
+
+    # Explicit dest_name override
+    with patch("cmdeploy.basedeploy.files.put", return_value=mock_res) as mock_put:
+        deployer.ensure_systemd_unit(
+            "acmetool/acmetool-reconcile.timer",
+            dest_name="acmetool-reconcile.timer",
+        )
+        assert (
+            mock_put.call_args.kwargs["dest"]
+            == "/etc/systemd/system/acmetool-reconcile.timer"
+        )
+
+
+def test_ensure_service():
+    with patch("cmdeploy.basedeploy.systemd.service") as mock_svc:
+        deployer = Deployer()
+        deployer.need_restart = True
+        deployer.daemon_reload = True
+        deployer.ensure_service("nginx.service")
+        mock_svc.assert_called_once_with(
+            name="Start and enable nginx.service",
+            service="nginx.service",
+            running=True,
+            enabled=True,
+            restarted=True,
+            daemon_reload=True,
+        )
+        # daemon_reload is cleared to avoid multiple systemctl daemon-reload calls
+        # need_restart is kept to ensure all subsequent services also restart
+        assert deployer.need_restart is True
+        assert deployer.daemon_reload is False
+
+    with patch("cmdeploy.basedeploy.systemd.service") as mock_svc:
+        # Stopping suppresses restarted even when need_restart is True
+        deployer = Deployer()
+        deployer.need_restart = True
+        deployer.daemon_reload = True
+        deployer.ensure_service(
+            "mta-sts-daemon.service",
+            running=False,
+            enabled=False,
+        )
+        assert mock_svc.call_args.kwargs["restarted"] is False
+        assert deployer.need_restart is True
+
+    with patch("cmdeploy.basedeploy.systemd.service") as mock_svc:
+        # Multiple calls: daemon_reload resets after first, need_restart persists
+        deployer = Deployer()
+        deployer.need_restart = True
+        deployer.daemon_reload = True
+        deployer.ensure_service("chatmaild.service")
+        deployer.ensure_service("chatmaild-metadata.service")
+        second_call = mock_svc.call_args_list[1]
+        assert second_call.kwargs["restarted"] is True
+        assert second_call.kwargs["daemon_reload"] is False

cmdeploy/src/cmdeploy/tests/test_cmdeploy.py

@@ -23,18 +23,30 @@ class TestCmdline:
         run = parser.parse_args(["run"])
         assert init and run
 
-    def test_init_not_overwrite(self, capsys):
-        assert main(["init", "chat.example.org"]) == 0
+    def test_init_not_overwrite(self, capsys, tmp_path, monkeypatch):
+        monkeypatch.delenv("CHATMAIL_INI", raising=False)
+        inipath = tmp_path / "chatmail.ini"
+        args = ["init", "--config", str(inipath), "chat.example.org"]
+        assert main(args) == 0
         capsys.readouterr()
 
-        assert main(["init", "chat.example.org"]) == 1
+        assert main(args) == 1
         out, err = capsys.readouterr()
         assert "path exists" in out.lower()
 
-        assert main(["init", "chat.example.org", "--force"]) == 0
+        args.insert(1, "--force")
+        assert main(args) == 0
         out, err = capsys.readouterr()
         assert "deleting config file" in out.lower()
 
+    def test_dns_skip_on_ip(self, capsys, tmp_path, monkeypatch):
+        monkeypatch.delenv("CHATMAIL_INI", raising=False)
+        inipath = tmp_path / "chatmail.ini"
+        assert main(["init", "--config", str(inipath), "1.3.3.7"]) == 0
+        assert main(["dns", "--config", str(inipath)]) == 0
+        out, err = capsys.readouterr()
+        assert out == "[WARNING] 1.3.3.7 is not a domain, skipping DNS checks.\n"
+
 
 def test_www_folder(example_config, tmp_path):
     reporoot = importlib.resources.files(__package__).joinpath("../../../../").resolve()

cmdeploy/src/cmdeploy/tests/test_dns.py

@@ -3,7 +3,8 @@ from copy import deepcopy
 import pytest
 
 from cmdeploy import remote
-from cmdeploy.dns import check_full_zone, check_initial_remote_data
+from cmdeploy.dns import check_full_zone, check_initial_remote_data, parse_zone_records
+from cmdeploy.remote.rdns import get_authoritative_ns
 
 
 @pytest.fixture
@@ -14,11 +15,15 @@ def mockdns_base(monkeypatch):
         if command.startswith("dig"):
             if command == "dig":
                 return "."
-            if "SOA" in command:
+            if "with.public.soa" in command and "NS" in command:
+                return "domain.with.public.soa. 2419 IN NS ns1.first-ns.de."
+            if "with.hidden.soa" in command and "NS" in command:
                 return (
-                    "delta.chat. 21600 IN SOA ns1.first-ns.de. dns.hetzner.com."
-                    " 2025102800 14400 1800 604800 3600"
+                    "domain.with.hidden.soa. 2137 IN NS ns1.desec.io.\n"
+                    "domain.with.hidden.soa. 2137 IN NS ns2.desec.org."
                 )
+            if "NS" in command:
+                return "delta.chat. 21600 IN NS ns1.first-ns.de."
             command_chunks = command.split()
             domain, typ = command_chunks[4], command_chunks[6]
             try:
@@ -60,6 +65,29 @@ def mockdns(request, mockdns_base, mockdns_expected):
     return mockdns_base
 
 
+class TestGetDkimEntry:
+    def test_dkim_entry_returns_tuple_on_success(self, mockdns):
+        entry, web_entry = remote.rdns.get_dkim_entry(
+            "some.domain", "", dkim_selector="opendkim"
+        )
+        # May return None,None if openssl not available, but should never crash
+        if entry is not None:
+            assert "opendkim._domainkey.some.domain" in entry
+            assert "opendkim._domainkey.some.domain" in web_entry
+
+    def test_dkim_entry_returns_none_tuple_on_error(self, monkeypatch):
+        """CalledProcessError must return (None, None), not bare None."""
+        from subprocess import CalledProcessError
+
+        def failing_shell(command, fail_ok=False, print=print):
+            raise CalledProcessError(1, command)
+
+        monkeypatch.setattr(remote.rdns, "shell", failing_shell)
+        result = remote.rdns.get_dkim_entry("some.domain", "", dkim_selector="opendkim")
+        assert result == (None, None)
+        assert result[0] is None and result[1] is None
+
+
 class TestPerformInitialChecks:
     def test_perform_initial_checks_ok1(self, mockdns, mockdns_expected):
         remote_data = remote.rdns.perform_initial_checks("some.domain")
@@ -102,18 +130,60 @@ class TestPerformInitialChecks:
         assert not l
 
 
+@pytest.mark.parametrize(
+    ("domain", "ns"),
+    [
+        ("domain.with.public.soa", "ns1.first-ns.de."),
+        ("domain.with.hidden.soa", "ns1.desec.io."),
+    ],
+)
+def test_get_authoritative_ns(domain, ns, mockdns):
+    assert get_authoritative_ns(domain) == ns
+
+
+def test_parse_zone_records():
+    text = """
+    ; This is a comment
+    some.domain. 3600 IN A 1.1.1.1
+
+    ; Another comment
+    www.some.domain. 3600 IN CNAME some.domain.
+
+    ; Multi-word rdata
+    some.domain. 3600 IN MX 10 mail.some.domain.
+
+    ; DKIM record (single line, multi-word TXT rdata)
+    dkim._domainkey.some.domain. 3600 IN TXT "v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG" "9w0BAQEFAAOCAQ8AMIIBCgKCAQEA"
+
+    ; Another TXT record
+    _dmarc.some.domain. 3600 IN TXT "v=DMARC1;p=reject"
+    """
+    records = list(parse_zone_records(text))
+    assert records == [
+        ("some.domain", "3600", "A", "1.1.1.1"),
+        ("www.some.domain", "3600", "CNAME", "some.domain."),
+        ("some.domain", "3600", "MX", "10 mail.some.domain."),
+        (
+            "dkim._domainkey.some.domain",
+            "3600",
+            "TXT",
+            '"v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG" "9w0BAQEFAAOCAQ8AMIIBCgKCAQEA"',
+        ),
+        ("_dmarc.some.domain", "3600", "TXT", '"v=DMARC1;p=reject"'),
+    ]
+
+
+def test_parse_zone_records_invalid_line():
+    text = "invalid line"
+    with pytest.raises(ValueError, match="Bad zone record line"):
+        list(parse_zone_records(text))
+
+
 def parse_zonefile_into_dict(zonefile, mockdns_base, only_required=False):
-    for zf_line in zonefile.split("\n"):
-        if zf_line.startswith("#"):
-            if "Recommended" in zf_line and only_required:
-                return
-            continue
-        if not zf_line.strip():
-            continue
-        zf_domain, zf_typ, zf_value = zf_line.split(maxsplit=2)
-        zf_domain = zf_domain.rstrip(".")
-        zf_value = zf_value.strip()
-        mockdns_base.setdefault(zf_typ, {})[zf_domain] = zf_value
+    if only_required:
+        zonefile = zonefile.split("; Recommended")[0]
+    for name, ttl, rtype, rdata in parse_zone_records(zonefile):
+        mockdns_base.setdefault(rtype, {})[name] = rdata
 
 
 class MockSSHExec:

cmdeploy/src/cmdeploy/tests/test_dovecot_deployer.py

@@ -0,0 +1,237 @@
+from contextlib import nullcontext
+from types import SimpleNamespace
+
+import pytest
+from pyinfra.facts.deb import DebPackages
+
+from cmdeploy.dovecot import deployer as dovecot_deployer
+
+
+def make_host(*fact_pairs):
+    """Build a mock host; get_fact(cls) dispatches to the provided facts mapping.
+
+    Args:
+        *fact_pairs: tuples of (fact_class, fact_value) to register
+
+    Returns:
+        SimpleNamespace with get_fact that raises a clear error if an
+        unexpected fact type is requested.
+    """
+    facts = dict(fact_pairs)
+
+    def get_fact(cls):
+        if cls not in facts:
+            registered = ", ".join(c.__name__ for c in facts)
+            raise LookupError(
+                f"unexpected get_fact({cls.__name__}); only registered: {registered}"
+            )
+        return facts[cls]
+
+    return SimpleNamespace(get_fact=get_fact)
+
+
+@pytest.fixture
+def deployer():
+    return dovecot_deployer.DovecotDeployer(
+        SimpleNamespace(mail_domain="chat.example.org"),
+        disable_mail=False,
+    )
+
+
+@pytest.fixture
+def patch_blocked(monkeypatch):
+    monkeypatch.setattr(dovecot_deployer, "blocked_service_startup", nullcontext)
+
+
+@pytest.fixture
+def mock_files_put(monkeypatch):
+    monkeypatch.setattr(
+        dovecot_deployer.files,
+        "put",
+        lambda **kwargs: SimpleNamespace(changed=False),
+    )
+
+
+@pytest.fixture
+def track_shell(monkeypatch):
+    calls = []
+    monkeypatch.setattr(
+        dovecot_deployer.server,
+        "shell",
+        lambda **kwargs: calls.append(kwargs) or SimpleNamespace(changed=False),
+    )
+    return calls
+
+
+def test_download_dovecot_package_skips_epoch_matched_install(monkeypatch):
+    epoch_version = dovecot_deployer.DOVECOT_PACKAGE_VERSION
+    downloads = []
+    monkeypatch.setattr(
+        dovecot_deployer,
+        "host",
+        make_host((DebPackages, {"dovecot-core": [epoch_version]})),
+    )
+    monkeypatch.setattr(
+        dovecot_deployer,
+        "_pick_url",
+        lambda primary, fallback: primary,
+    )
+    monkeypatch.setattr(
+        dovecot_deployer.files,
+        "download",
+        lambda **kwargs: downloads.append(kwargs),
+    )
+
+    deb, changed = dovecot_deployer._download_dovecot_package("core", "amd64")
+
+    assert deb is None, f"expected no deb path when version matches, got {deb!r}"
+    assert changed is False, "should not flag changed when version already installed"
+    assert downloads == [], "should not download when version already installed"
+
+
+def test_download_dovecot_package_uses_archive_version_for_url_and_filename(
+    monkeypatch,
+):
+    downloads = []
+    monkeypatch.setattr(
+        dovecot_deployer,
+        "host",
+        make_host((DebPackages, {})),
+    )
+    monkeypatch.setattr(
+        dovecot_deployer,
+        "_pick_url",
+        lambda primary, fallback: primary,
+    )
+    monkeypatch.setattr(
+        dovecot_deployer.files,
+        "download",
+        lambda **kwargs: downloads.append(kwargs),
+    )
+
+    deb, changed = dovecot_deployer._download_dovecot_package("core", "amd64")
+
+    archive_version = dovecot_deployer.DOVECOT_ARCHIVE_VERSION.replace("+", "%2B")
+    expected_deb = f"/root/dovecot-core_{archive_version}_amd64.deb"
+
+    # Verify the returned path uses archive version, not package version (with epoch)
+    assert changed is True, "should flag changed when package not yet installed"
+    assert deb == expected_deb, f"deb path mismatch: {deb!r} != {expected_deb!r}"
+    assert dovecot_deployer.DOVECOT_PACKAGE_VERSION not in deb, (
+        f"deb path should use archive version (no epoch), got {deb!r}"
+    )
+    assert len(downloads) == 1, "files.download should be called exactly once"
+
+
+def test_install_skips_dpkg_path_when_epoch_matched_packages_present(
+    deployer, patch_blocked, mock_files_put, track_shell, monkeypatch
+):
+    monkeypatch.setattr(
+        dovecot_deployer,
+        "host",
+        make_host(
+            (
+                dovecot_deployer.DebPackages,
+                {
+                    "dovecot-core": [dovecot_deployer.DOVECOT_PACKAGE_VERSION],
+                    "dovecot-imapd": [dovecot_deployer.DOVECOT_PACKAGE_VERSION],
+                    "dovecot-lmtpd": [dovecot_deployer.DOVECOT_PACKAGE_VERSION],
+                },
+            ),
+            (dovecot_deployer.Arch, "x86_64"),
+        ),
+    )
+    downloads = []
+    monkeypatch.setattr(
+        dovecot_deployer.files,
+        "download",
+        lambda **kwargs: downloads.append(kwargs),
+    )
+
+    deployer.install()
+
+    assert downloads == [], "should not download when all packages epoch-matched"
+    assert track_shell == [], "should not run dpkg when all packages epoch-matched"
+    assert deployer.need_restart is False, (
+        "need_restart should be False when nothing changed"
+    )
+
+
+def test_install_unsupported_arch_falls_back_to_apt(
+    deployer, patch_blocked, mock_files_put, track_shell, monkeypatch
+):
+    # For unsupported architectures, all fact lookups return the arch string.
+    monkeypatch.setattr(
+        dovecot_deployer,
+        "host",
+        SimpleNamespace(get_fact=lambda cls: "riscv64"),
+    )
+    apt_calls = []
+
+    # Mirrors apt.packages() return value: OperationMeta with .changed property.
+    # Only lmtpd triggers a change to verify |= accumulation of changed flags.
+    def fake_apt(**kwargs):
+        apt_calls.append(kwargs)
+        changed = "lmtpd" in kwargs["packages"][0]
+        return SimpleNamespace(changed=changed)
+
+    monkeypatch.setattr(dovecot_deployer.apt, "packages", fake_apt)
+
+    deployer.install()
+
+    actual_pkgs = [c["packages"] for c in apt_calls]
+    assert actual_pkgs == [["dovecot-core"], ["dovecot-imapd"], ["dovecot-lmtpd"]], (
+        f"expected apt install of core/imapd/lmtpd, got {actual_pkgs}"
+    )
+    assert track_shell == [], "should not run dpkg for unsupported arch"
+    assert deployer.need_restart is True, (
+        "need_restart should be True when apt installed a package"
+    )
+
+
+def test_install_runs_dpkg_when_packages_need_download(
+    deployer, patch_blocked, mock_files_put, track_shell, monkeypatch
+):
+    monkeypatch.setattr(
+        dovecot_deployer,
+        "host",
+        make_host(
+            (dovecot_deployer.DebPackages, {}),
+            (dovecot_deployer.Arch, "x86_64"),
+        ),
+    )
+    monkeypatch.setattr(
+        dovecot_deployer,
+        "_pick_url",
+        lambda primary, fallback: primary,
+    )
+    monkeypatch.setattr(
+        dovecot_deployer.files,
+        "download",
+        lambda **kwargs: SimpleNamespace(changed=True),
+    )
+
+    deployer.install()
+
+    assert len(track_shell) == 1, (
+        f"expected one server.shell() call for dpkg install, got {len(track_shell)}"
+    )
+    cmds = track_shell[0]["commands"]
+    assert len(cmds) == 3, f"expected 3 dpkg/apt commands, got: {cmds}"
+    assert cmds[0].startswith("dpkg --force-confdef --force-confold -i ")
+    assert "apt-get -y --fix-broken install" in cmds[1]
+    assert cmds[2].startswith("dpkg --force-confdef --force-confold -i ")
+    assert deployer.need_restart is True, (
+        "need_restart should be True after dpkg install"
+    )
+
+
+def test_pick_url_falls_back_on_primary_error(monkeypatch):
+    def raise_error(req, timeout):
+        raise OSError("connection timeout")
+
+    monkeypatch.setattr(dovecot_deployer.urllib.request, "urlopen", raise_error)
+    result = dovecot_deployer._pick_url("http://primary", "http://fallback")
+    assert result == "http://fallback", (
+        f"should fall back when primary fails, got {result!r}"
+    )

cmdeploy/src/cmdeploy/tests/test_helpers.py

@@ -1,11 +1,10 @@
-import importlib.resources
+from pathlib import Path
 
 from cmdeploy.www import build_webpages
 
 
 def test_build_webpages(tmp_path, make_config):
-    pkgroot = importlib.resources.files("cmdeploy")
-    src_dir = pkgroot.joinpath("../../../www/src").resolve()
+    src_dir = (Path(__file__).resolve() / "../../../../../www/src").resolve()
     assert src_dir.exists(), src_dir
     config = make_config("chat.example.org")
     build_dir = tmp_path.joinpath("build")

cmdeploy/src/cmdeploy/tests/test_rshell.py

@@ -0,0 +1,68 @@
+from unittest.mock import patch
+
+from cmdeploy.remote.rshell import dovecot_recalc_quota
+
+
+def test_dovecot_recalc_quota_normal_output():
+    """Normal doveadm output returns parsed dict."""
+    normal_output = (
+        "Quota name Type    Value  Limit  %\n"
+        "User quota STORAGE     5 102400  0\n"
+        "User quota MESSAGE     2      -  0\n"
+    )
+
+    with patch("cmdeploy.remote.rshell.shell", return_value=normal_output):
+        result = dovecot_recalc_quota("user@example.org")
+
+    # shell is called twice (recalc + get), patch returns same for both
+    assert result == {"value": 5, "limit": 102400, "percent": 0}
+
+
+def test_dovecot_recalc_quota_empty_output():
+    """Empty doveadm output (trailing newline) must not IndexError."""
+    call_count = [0]
+
+    def mock_shell(cmd):
+        call_count[0] += 1
+        if "recalc" in cmd:
+            return ""
+        # quota get returns only empty lines
+        return "\n\n"
+
+    with patch("cmdeploy.remote.rshell.shell", side_effect=mock_shell):
+        result = dovecot_recalc_quota("user@example.org")
+
+    assert result is None
+
+
+def test_dovecot_recalc_quota_malformed_output():
+    """Malformed output with too few columns must not crash."""
+    call_count = [0]
+
+    def mock_shell(cmd):
+        call_count[0] += 1
+        if "recalc" in cmd:
+            return ""
+        # partial line, fewer than 6 parts
+        return "Quota name\nUser quota STORAGE\n"
+
+    with patch("cmdeploy.remote.rshell.shell", side_effect=mock_shell):
+        result = dovecot_recalc_quota("user@example.org")
+
+    assert result is None
+
+
+def test_dovecot_recalc_quota_header_only():
+    """Only header line, no data rows."""
+    call_count = [0]
+
+    def mock_shell(cmd):
+        call_count[0] += 1
+        if "recalc" in cmd:
+            return ""
+        return "Quota name Type    Value  Limit  %\n"
+
+    with patch("cmdeploy.remote.rshell.shell", side_effect=mock_shell):
+        result = dovecot_recalc_quota("user@example.org")
+
+    assert result is None

cmdeploy/src/cmdeploy/unbound/unbound.conf.j2

@@ -1,4 +1,7 @@
-# Managed by cmdeploy: disable IPv6 in unbound.
+# Managed by cmdeploy
 server:
+{% if disable_ipv6 %}
   interface: 127.0.0.1
   do-ip6: no
+{% endif %}
+  cache-max-negative-ttl: 0

cmdeploy/src/cmdeploy/www.py

@@ -1,5 +1,4 @@
 import hashlib
-import importlib.resources
 import re
 import time
 import traceback
@@ -37,7 +36,7 @@ def prepare_template(source):
 
 
 def get_paths(config) -> (Path, Path, Path):
-    reporoot = importlib.resources.files(__package__).joinpath("../../../").resolve()
+    reporoot = (Path(__file__).resolve() / "../../../../").resolve()
     www_path = Path(config.www_folder)
     # if www_folder was not set, use default directory
     if config.www_folder == "":
@@ -133,8 +132,7 @@ def find_merge_conflict(src_dir) -> Path:
 
 
 def main():
-    path = importlib.resources.files(__package__)
-    reporoot = path.joinpath("../../../").resolve()
+    reporoot = (Path(__file__).resolve() / "../../../../").resolve()
     inipath = reporoot.joinpath("chatmail.ini")
     config = read_config(inipath)
     config.webdev = True

doc/README.md

@@ -4,12 +4,14 @@
 
 You can use the `make` command and `make html` to build web pages. 
 
-You need a Python environment where the following install was excuted: 
-
-    pip install furo sphinx-autobuild
+You need a Python environment with `sphinx` and other
+dependencies, you can create it by running `scripts/initenv.sh`
+from the repository root.
 
 To develop/change documentation, you can then do: 
 
+    . venv/bin/activate
+    cd doc
     make auto 
 
 A page will open at https://127.0.0.1:8000/ serving the docs and it will 

doc/source/docker.rst

@@ -1,266 +0,0 @@
-Docker installation
-===================
-
-This section provides instructions for installing a chatmail relay
-using Docker Compose.
-
-.. note::
-
-    - Docker support is experimental, CI builds and tests the image automatically, but please report bugs.
-    - The image wraps the cmdeploy process detailed in the :doc:`getting_started` instructions in a Debian-systemd image with r/w access to `/sys/fs`
-    - Currently amd64-only (arm64 should work but is untested).
-
-
-Setup Preparation
------------------
-
-We use ``chat.example.org`` as the chatmail domain in the following
-steps. Please substitute it with your own domain.
-
-1. Install docker and docker compose v2 (check with `docker compose version`), install, e.g., through
-    - Debian 12 through the `official install instructions <https://docs.docker.com/engine/install/debian/#install-using-the-repository>`_
-    - Debian 13+ with `apt install docker docker-compose`
-
-   If you must use v1 (EOL since 2023), use `docker-compose` in the following and modify the `docker-compose.yaml` to use `privileged: true` instead of `cgroup: host`, though that gives the container full privileges.
-
-2. Setup the initial DNS records.
-   The following is an example in the familiar BIND zone file format with
-   a TTL of 1 hour (3600 seconds).
-   Please substitute your domain and IP addresses.
-
-   ::
-
-       chat.example.org. 3600 IN A 198.51.100.5
-       chat.example.org. 3600 IN AAAA 2001:db8::5
-       www.chat.example.org. 3600 IN CNAME chat.example.org.
-       mta-sts.chat.example.org. 3600 IN CNAME chat.example.org.
-
-3. Configure kernel parameters on the host, as these can not be set from the container::
-
-       echo "fs.inotify.max_user_instances=65536" | sudo tee -a /etc/sysctl.d/99-inotify.conf
-       echo "fs.inotify.max_user_watches=65536" | sudo tee -a /etc/sysctl.d/99-inotify.conf
-       sudo sysctl --system
-
-
-Docker Compose Setup
---------------------
-
-Pre-built images are available from GitHub Container Registry. The
-``main`` branch and tagged releases are pushed automatically by CI::
-
-    docker pull ghcr.io/chatmail/relay:main      # latest main branch
-    docker pull ghcr.io/chatmail/relay:1.2.3     # tagged release
-
-
-Create service directory
-^^^^^^^^^^^^^^^^^^^^^^^^
-
-Either:
-
-- Create a service directory, e.g., `/srv/chatmail-relay`::
-
-    mkdir -p /srv/chatmail-relay && cd /srv/chatmail-relay
-    wget https://raw.githubusercontent.com/chatmail/relay/refs/heads/main/docker-compose.yaml
-    wget https://raw.githubusercontent.com/chatmail/relay/refs/heads/main/docker-compose.override.yaml.example -O docker-compose.override.yaml
-
-- or clone the chatmail repo ::
-
-   git clone https://github.com/chatmail/relay
-   cd relay
-
-
-Customize and start
-^^^^^^^^^^^^^^^^^^^
-
-1. Set the fully qualified domain name of the relay::
-
-       echo 'MAIL_DOMAIN=chat.example.org' > .env
-
-   The container generates a ``chatmail.ini`` with defaults from
-   ``MAIL_DOMAIN`` on first start. To customize chatmail settings, mount
-   your own ``chatmail.ini`` instead (see `Custom chatmail.ini`_ below).
-
-2. All local customizations (data paths, extra volumes, config mounts) go in
-   ``docker-compose.override.yaml``, which Compose merges automatically with
-   the base file. By default, all data is stored in docker volumes, you will
-   likely want to at least create and configure the mail storage location, but
-   you might also want to configure external TLS certificates there.
-
-3. Start the container::
-
-       docker compose up -d
-       docker compose logs -f chatmail   # view logs, Ctrl+C to exit
-
-4. After installation is complete, open ``https://chat.example.org`` in
-   your browser.
-
-Finish install and test
------------------------
-
-You can test the installation with::
-
-        pip install cmping chat.example.org # or
-        uvx cmping chat.example.org # if you use https://docs.astral.sh/uv/
-
-You should check and extend your DNS records for better interoperability::
-
-    # Show required DNS records
-    docker exec chatmail cmdeploy dns --ssh-host @local
-
-You can check server status with::
-
-    docker exec chatmail cmdeploy status --ssh-host @local
-
-You can run some benchmarks (can also run from any machine with cmdeploy installed)::
-
-    docker exec chatmail cmdeploy bench
-
-You can run the test suite with::
-
-    docker exec chatmail cmdeploy test --ssh-host localhost
-
-You can look at logs::
-
-    docker exec chatmail journalctl -fu postfix@-
-
-
-Customization
--------------
-
-Website
-^^^^^^^^^^^^^^
-
-You can customize the chatmail landing page by mounting a directory with
-your own website source files.
-
-1. Create a directory with your custom website source::
-
-       mkdir -p ./custom/www/src
-       nano ./custom/www/src/index.md
-
-2. Add the volume mount in ``docker-compose.override.yaml``::
-
-       services:
-         chatmail:
-           volumes:
-             - ./custom/www:/opt/chatmail-www
-
-3. Restart the service::
-
-       docker compose down
-       docker compose up -d
-
-
-Custom chatmail.ini
-^^^^^^^^^^^^^^^^^^^
-
-If you want to go beyond simply setting the ``MAIL_DOMAIN`` in ``.env``, you
-can use a regular `chatmail.ini` to give you full control.
-
-1. Extract the generated config from a running container::
-
-       docker cp chatmail:/etc/chatmail/chatmail.ini ./chatmail.ini
-
-2. Edit ``chatmail.ini`` as needed.
-
-3. Add the volume mount in ``docker-compose.override.yaml`` ::
-
-       services:
-         chatmail:
-           volumes:
-             - ./chatmail.ini:/etc/chatmail/chatmail.ini
-
-4. Restart the container, the container skips generating a new one: ::
-
-       docker compose down && docker compose up -d
-
-
-External TLS certificates
-^^^^^^^^^^^^^^^^^^^^^^^^^
-
-If TLS certificates are managed outside the container (e.g. by certbot,
-acmetool, or Traefik on the host), mount them into the container and set
-``TLS_EXTERNAL_CERT_AND_KEY`` in ``docker-compose.override.yaml``.
-Changed certificates are picked up automatically via inotify.
-See the examples in the example override and :ref:`external-tls` in the getting started guide for details.
-
-
-Migrating from a bare-metal install
-------------------------------------
-
-If you have an existing bare-metal chatmail installation and want to
-switch to Docker:
-
-1. Stop all existing services::
-
-       systemctl stop postfix dovecot doveauth nginx opendkim unbound \
-         acmetool-redirector filtermail filtermail-incoming chatmail-turn \
-         iroh-relay chatmail-metadata lastlogin mtail
-       systemctl disable postfix dovecot doveauth nginx opendkim unbound \
-         acmetool-redirector filtermail filtermail-incoming chatmail-turn \
-         iroh-relay chatmail-metadata lastlogin mtail
-
-2. Copy your existing ``chatmail.ini`` and mount it into the container
-   (see `Custom chatmail.ini`_ above)::
-
-       cp /usr/local/lib/chatmaild/chatmail.ini ./chatmail.ini
-
-3. Copy persistent data into the ``./data/`` subdirectories (for example, as configured in `Customize and start`_) ::
-
-       mkdir -p data/dkim data/certs data/mail
-
-       # DKIM keys
-       cp -a /etc/dkimkeys/* data/dkim/
-
-       # TLS certificates
-       rsync -a /var/lib/acme/ data/certs/
-
-   Note that ownership of dkim and acme is adjusted on container start.
-
-   For the mail directory::
-
-       rsync -a /home/vmail/ data/mail/
-
-   Alternatively, mount ``/home/vmail`` directly by changing the volume
-   in ``docker-compose-override.yaml``::
-
-       - /home/vmail:/home/vmail
-
-   The three ``./data/`` subdirectories cover all persistent state.
-   Everything else is regenerated by the ``configure`` and ``activate``
-   stages on container start.
-
-Building the image
-------------------
-
-Clone the repository and build the Docker image::
-
-    git clone https://github.com/chatmail/relay
-    cd relay
-    docker/build.sh
-
-The build bakes all binaries, Python packages, and the install stage
-into the image. After building, only ``docker-compose.yaml`` and a ``.env``
-with ``MAIL_DOMAIN`` are needed to run the container. The `build.sh` passes the
-git hash onto the docker build so it can be determined if there has been a
-change that warrants a redeploy.
-
-You can transfer a locally built image to your server directly (pigz is parallel `gzip` which can be used instead as well) ::
-
-    docker save chatmail-relay:latest | pigz | ssh chat.example.org 'pigz -d | docker load'
-
-
-Forcing a full reinstall
-------------------------
-
-On container start, only the ``configure`` and ``activate`` stages run by default.
-
-To force a full reinstall (e.g. after updating the source), either
-rebuild the image::
-
-    docker compose build chatmail
-    docker compose up -d
-
-Or override the stages at runtime without rebuilding::
-
-    CMDEPLOY_STAGES="install,configure,activate" docker compose up -d

doc/source/faq.rst

@@ -15,6 +15,7 @@ goes beyond what classic email servers offer:
    streaming, privacy-preserving Push Notifications for Apple, Google, and `Ubuntu Touch <https://docs.ubports.com/en/latest/appdev/guides/pushnotifications.html>`_;
 
 -  **Security Enforcement**: only strict TLS, DKIM and OpenPGP with minimized metadata accepted
+   (DKIM is not enforced on :ref:`IP-only relays <iponly>`)
 
 -  **Reliable Federation and Decentralization:** No spam or IP reputation checks, federating
    depends on established IETF standards and protocols.
@@ -47,6 +48,29 @@ Dovecot, and are configured to run unattended without much maintenance
 effort. Chatmail relays happily run on low-end hardware like a Raspberry
 Pi.
 
+.. _upgrade:
+
+How can I upgrade my chatmail relay?
+------------------------------------
+
+To upgrade to the latest ``main`` branch,
+``cd`` into your local checkout of `https://github.com/chatmail/relay/`_
+and run the following commands:
+
+   ::
+
+       git pull origin main --rebase --autostash
+       scripts/initenv.sh
+       scripts/cmdeploy run
+
+If you don't want the latest development version,
+but a specific tagged release like `1.10.0 <https://github.com/chatmail/relay/releases/tag/1.10.0>`_,
+run ``git pull origin 1.10.0`` instead.
+
+If you made local changes for your setup,
+they will be reapplied as long as they don't conflict with the upgrade.
+If a conflict arises, ``git status`` will tell you how to resolve it.
+
 
 How trustable are chatmail relays?
 ----------------------------------

doc/source/getting_started.rst

@@ -14,8 +14,6 @@ Minimal requirements and prerequisites
 
 You will need the following:
 
--  Control over a domain through a DNS provider of your choice.
-
 -  A Debian 12 **deployment server** with reachable SMTP/SUBMISSIONS/IMAPS/HTTPS ports.
    IPv6 is encouraged if available. Chatmail relay servers only require
    1GB RAM, one CPU, and perhaps 10GB storage for a few thousand active
@@ -28,6 +26,11 @@ You will need the following:
    (An ed25519 private key is required due to an `upstream bug in
    paramiko <https://github.com/paramiko/paramiko/issues/2191>`_)
 
+-  Control over a domain through a DNS provider of your choice
+   (there is experimental support for :ref:`IP-only relays <iponly>`).
+
+
+.. _setup:
 
 Setup with ``scripts/cmdeploy``
 -------------------------------------
@@ -98,11 +101,14 @@ steps. Please substitute it with your own domain.
    configure at your DNS provider (it can take some time until they are
    public).
 
+
+
 Docker installation
 -------------------
 
-There is experimental support for running chatmail via Docker Compose.
-See :doc:`docker` for full setup instructions.
+There is experimental support for running chatmail via Docker.
+A monolithic image based on the above cmdeploy method is available `through a separate repository <https://github.com/chatmail/docker/pkgs/container/docker>`_.
+See the `chatmail/docker README <https://github.com/chatmail/docker>`_ for full setup instructions.
 
 Other helpful commands
 ----------------------

doc/source/index.rst

@@ -13,9 +13,10 @@ Contributions and feedback welcome through the https://github.com/chatmail/relay
     :maxdepth: 5
 
     getting_started
-    docker
     proxy
     migrate
     overview
+    reverse_dns
     related
     faq
+    iponly

doc/source/iponly.rst

@@ -0,0 +1,40 @@
+.. _iponly:
+
+Hosting without DNS records
+===========================
+
+.. note::
+
+   This option is experimental and might change without notice.
+
+In case you don't have a domain,
+for example in a local network,
+you can run a chatmail relay with only an IPv4 address as well.
+
+To deploy a relay without a domain,
+run ``cmdeploy init`` with only the IPv4 address
+during the :ref:`installation steps <setup>`,
+for example ``cmdeploy init 13.12.23.42``.
+
+Drawbacks
+---------
+
+- your transport encryption will only use self-signed TLS certificates,
+  which are vulnerable against MITM attacks.
+  the chatmail core's end-to-end encryption should suffice in most scenarios though.
+
+- your messages will not be DKIM-signed;
+  experimentally, most chatmail relays accept non-DKIM-signed messages from IP-only relays,
+  but some relays might not accept messages from yours.
+
+
+Email addresses
+---------------
+
+When running without a domain,
+your chatmail addresses will use the IPv4 address
+in brackets as the domain part,
+for example ``user@[13.12.23.42]``.
+This is a valid email address format
+according to :rfc:`5321`.
+

doc/source/overview.rst

@@ -102,17 +102,17 @@ short overview of ``chatmaild`` services:
    Apple/Google/Huawei.
 
 -  `chatmail-expire <https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/expire.py>`_
-   deletes users if they have not logged in for a longer while.
-   The timeframe can be configured in ``chatmail.ini``.
+   deletes old messages, large messages, and entire mailboxes
+   of users who have not logged in for longer than
+   ``delete_inactive_users_after`` days.
+
+-  ``chatmail-quota-expire`` is called by Dovecot's ``quota_warning`` mechanism
+   and will automatically remove oldest messages to keep mailboxes well under ``max_mailbox_size``.
 
 -  `lastlogin <https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/lastlogin.py>`_
    is contacted by Dovecot when a user logs in and stores the date of
    the login.
 
--  `metrics <https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/metrics.py>`_
-   collects some metrics and displays them at
-   ``https://example.org/metrics``.
-
 ``www/``
 ~~~~~~~~~
 
@@ -142,11 +142,9 @@ Chatmail relay dependency diagram
         nginx-internal --- autoconfig.xml;
         certs-nginx[("`TLS certs
         /var/lib/acme`")] --> nginx-internal;
-        systemd-timer --- chatmail-metrics;
         systemd-timer --- acmetool;
         systemd-timer --- chatmail-expire-daily;
         systemd-timer --- chatmail-fsreport-daily;
-        chatmail-metrics --- website;
         acmetool --> certs[("`TLS certs
         /var/lib/acme`")];
         nginx-external --- |993|dovecot;
@@ -155,13 +153,17 @@ Chatmail relay dependency diagram
         autoconfig.xml --- dovecot;
         postfix --- |10080|filtermail-outgoing;
         postfix --- |10081|filtermail-incoming;
+        postfix --- |10083|filtermail-transport;
         filtermail-outgoing --- |10025 reinject|postfix;
         filtermail-incoming --- |10026 reinject|postfix;
+        postfix --- |milter opendkim.sock|OpenDKIM
         dovecot --- |doveauth.socket|doveauth;
         dovecot --- |message delivery|maildir["maildir
         /home/vmail/.../user"];
         dovecot --- |lastlogin.socket|lastlogin;
         dovecot --- chatmail-metadata;
+        dovecot --- |quota-warning|chatmail-quota-expire;
+        chatmail-quota-expire --- maildir;
         lastlogin --- maildir;
         doveauth --- maildir;
         chatmail-expire-daily --- maildir;
@@ -178,26 +180,51 @@ Chatmail relay dependency diagram
         style nginx-right fill:#f66;
         style postfix fill:#f66;
         style dovecot fill:#f66;
+        style OpenDKIM fill:#f66;
         style notification-proxy fill:#f66;
 
-Message between users on the same relay
----------------------------------------
+Accepting and delivering mail
+-----------------------------
 
 .. mermaid::
-    :caption: This diagram shows the path a non-federated message takes.
+    :caption: This diagram shows all the paths a message can take.
 
-    graph LR;
-        sender --> |465|smtps/smtpd;
-        sender --> |587|submission/smtpd;
-        smtps/smtpd --> |10080|filtermail;
-        submission/smtpd --> |10080|filtermail;
-        filtermail --> |10025|smtpd_reinject;
-        smtpd_reinject --> cleanup;
-        cleanup --> qmgr;
-        qmgr --> smtpd_accepts_message;
-        qmgr --> |lmtp|dovecot;
-        dovecot --> recipient;
-        dovecot --> sender's_other_devices;
+    flowchart LR
+        subgraph chatmail relay
+            subgraph postfix
+                qmgr .-> lmtp-filtermail["lmtp/lmtp-filtermail (default_transport)"]
+                qmgr .-> lmtp["lmtp (local_transport)"]
+                lmtp --> cleanup["cleanup (lmtp_header_cleanup)"]
+                bounce
+                smtpd-submission["smtpd/submission"]
+                smtpd-smtps["smtpd/smtps"]
+                smtpd-reinject-outgoing["smtpd/reinject-outgoing"] --> authclean["cleanup/authclean (submission_header_cleanup)"]
+                authclean --> qmgr
+                smtpd-smtp["smtpd/smtp"]
+                smtpd-reinject-incoming["smtpd/reinject-incoming"] --> qmgr
+            end
+            lmtp-filtermail --LMTP inet:10083--> filtermail-transport
+            cleanup --LMTP unix:private/dovecot-lmtp --> dovecot
+            dovecot --> maildir
+            smtpd-submission --SMTP inet:10080--> filtermail-outgoing
+            smtpd-smtps --SMTP inet:10080--> filtermail-outgoing
+            filtermail-outgoing --SMTP inet:10025--> smtpd-reinject-outgoing
+            open-dkim["OpenDKIM (signing only)"] <--milter unix:opendkim/opendkim.sock--> smtpd-reinject-outgoing
+            bounce <--milter unix:opendkim/opendkim.sock--> open-dkim
+            bounce --> qmgr
+            nginx
+            smtpd-smtp -.SMTP inet:10081.-> filtermail-incoming
+            nginx -.HTTP inet:10082.-> filtermail-incoming
+            filtermail-incoming --SMTP inet:10026--> smtpd-reinject-incoming
+        end
+        filtermail-transport -.SMTP inet:25.-> mta1[Remote relay]
+        filtermail-transport -.HTTPS /mxdeliv.-> mta1
+        client[Client] -.SMTP inet:587.-> smtpd-submission
+        client -.SMTP inet:465.-> smtpd-smtps
+        client -.SMTP inet:443.-> nginx
+        nginx -.SMTP inet:465.-> smtpd-smtps
+        mta2[Remote relay] -.SMTP inet:25.-> smtpd-smtp
+        mta2 -.HTTPS /mxdeliv.-> nginx
 
 Operational details of a chatmail relay
 ----------------------------------------
@@ -264,7 +291,8 @@ from the chatmail relay server.
 Email domain authentication (DKIM)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Chatmail relays enforce :rfc:`DKIM <6376>` to authenticate incoming emails.
+Chatmail relays enforce :rfc:`DKIM <6376>` to authenticate incoming emails
+(except for :ref:`IP-only relays <iponly>`).
 Incoming emails must have a valid DKIM signature with
 Signing Domain Identifier (SDID, ``d=`` parameter in the DKIM-Signature
 header) equal to the ``From:`` header domain. This property is checked
@@ -295,9 +323,7 @@ ensured by ``filtermail`` proxy.
 TLS requirements
 ~~~~~~~~~~~~~~~~
 
-Postfix is configured to require valid TLS by setting
-`smtp_tls_security_level <https://www.postfix.org/postconf.5.html#smtp_tls_security_level>`_
-to ``verify``.
+Filtermail (used for delivery) requires a valid TLS.
 
 You can test it by resolving ``MX`` records of your relay domain and
 then connecting to MX relays (e.g ``mx.example.org``) with

doc/source/reverse_dns.rst

@@ -0,0 +1,64 @@
+Configuring reverse DNS
+=======================
+
+Some email servers reject the emails
+if they don't pass `FCrDNS`_ check, also known as `iprev`_ check.
+
+.. _FCrDNS: https://en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS
+.. _iprev: https://datatracker.ietf.org/doc/html/rfc8601#section-3
+
+Passing the check requires that the IP address that email is sent from
+should have a ``PTR`` record pointing to the domain name of the server,
+and domain name record should have an ``A/AAAA`` record
+pointing to the IP address.
+
+Modern email relies on DKIM and SPF for authentication,
+while iprev check exists for
+`historical reasons <https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-reverse-mapping-considerations-06#section-2.1>`_.
+Chatmail relays don't resolve ``PTR`` records,
+so you can ignore this section if configuring ``PTR`` records
+is difficult and federation with legacy email servers that don't accept
+valid DKIM signature for authentication is not important.
+
+Multi-homed setups
+------------------
+
+If you have a server with multiple IP addresses,
+also known as multi-homed setup,
+and don't publish all IP addresses in DNS,
+you need to make sure you are using
+the published address when making outgoing connections.
+
+For example, your server may have a static IP
+address, and a so-called Floating IP or Virtual IP
+that can be moved between servers in case of
+migration or for failover.
+By using Floating IP you can avoid downtime
+and keep the IP address reputation
+for destinatinons that rely on IP reputation and IP blocklists.
+In this case you will only publish
+the Floating IP to DNS and only use the static IP
+to SSH into the server.
+
+If you have such setup, make sure that
+you not only set ``PTR`` records for the Floating IP,
+but make outgoing connections using the Floating IP.
+Otherwise reverse DNS check succeed,
+but forward check making sure your domain name points
+to the IP address will fail.
+Such setup is indistinguishable from someone
+setting IP address ``PTR`` with the domain they don't own
+and as a result don't succeed.
+
+On Linux you can configure source IP address with ``ip route`` command,
+for example:
+::
+
+  ip route change default via <default-gateway> dev eth0 src <source-address>
+
+Make sure to persist the change after verifying it is working.
+You can check what your outgoing IP address is
+with ``curl icanhazip.com``.
+Check both the IPv4 and IPv6 addresses.
+For IPv4 address use ``curl ipv4.icanhazip.com`` or ``curl -4 icanhazip.com``
+and similarly for IPv6 if you have it.

docker-compose.override.yaml.example

@@ -1,44 +0,0 @@
-# Local overrides: copy to docker-compose.override.yaml in the repo root.
-# Compose automatically merges this with docker-compose.yaml.
-#
-#   cp docker-compose.override.yaml.example docker-compose.override.yaml
-#
-# Volumes are APPENDED to the base file's volumes list, environment and other scalar keys are MERGED by key.
-services:
-  chatmail:
-    volumes:
-      ## Data paths — bind-mount to host directories for easy access/backup.
-
-      # - ./data/dkim:/etc/dkimkeys
-      # - ./data/certs:/var/lib/acme
-
-      # - ./data/mail:/home/vmail
-      ## Or mount from an existing bare-metal install.
-      # - /home/vmail:/home/vmail
-
-      ## Mount your own chatmail.ini (skips auto-generation):
-      # - ./chatmail.ini:/etc/chatmail/chatmail.ini
-
-      ## Custom website:
-      # - ./custom/www:/opt/chatmail-www
-
-      ## Debug — mount scripts from the repo for live editing:
-      # - ./docker/chatmail-init.sh:/chatmail-init.sh
-      # - ./docker/entrypoint.sh:/entrypoint.sh
-
-    # environment:
-      ## Mount certs (above) and set TLS_EXTERNAL_CERT_AND_KEY to in-container paths.
-      ## A tls-cert-reload.path watcher inside the container reloads services
-      ## when the cert file changes. However, inotify does not cross bind-mount
-      ## boundaries, so host-side renewals (certbot, acmetool, etc.) must
-      ## notify the container explicitly. Add this to your renewal hook:
-      ##
-      ##   docker exec chatmail systemctl start tls-cert-reload.service
-      ##
-      ## Host acmetool (bare-metal migration): create mount above, and
-      ##   rsync -a /var/lib/acme/live data/certs
-      # TLS_EXTERNAL_CERT_AND_KEY: "/var/lib/acme/live/${MAIL_DOMAIN}/fullchain /var/lib/acme/live/${MAIL_DOMAIN}/privkey"
-      ##
-      ## (Untested) Traefik certs-dumper (see docker/docker-compose-traefik.yaml) - also add volume:
-      ##   - traefik-certs:/certs:ro
-      # TLS_EXTERNAL_CERT_AND_KEY: "/certs/${MAIL_DOMAIN}/certificate.crt /certs/${MAIL_DOMAIN}/privatekey.key"

docker-compose.yaml

@@ -1,48 +0,0 @@
-# Base compose file — do not edit. Put customizations (data paths, extra
-# volumes, env overrides) in docker-compose.override.yaml instead.
-# See docker/docker-compose.override.yaml.example for a starting point.
-#
-# Security notes: this container uses 
-#  - network_mode:host chatmail needs many ports (25, 53, 80, 143, 443, 465,
-#  587, 993, 3340, 8443) and needs to operate from the real IP, which bridging
-#  would make tricky
-#  - cgroup:host (required for systemd). 
-#  Together these give the container near-host-level access. This is acceptable
-#  for a dedicated mail server, but be aware that the container can bind any
-#  port and see all host network traffic.
-
-services:
-  chatmail:
-    build:
-      context: ./
-      dockerfile: docker/chatmail_relay.dockerfile
-      args:
-        GIT_HASH: ${GIT_HASH:-unknown}
-    image: chatmail-relay:latest
-    restart: unless-stopped
-    container_name: chatmail
-    # Required for systemd — use only one of the following:
-    cgroup: host          # compose v2
-    # privileged: true    # compose v1 (less restricted)
-    tty: true # required for logs
-    tmpfs: # required for systemd
-      - /tmp
-      - /run
-      - /run/lock
-    logging:
-      driver: none
-    environment:
-      MAIL_DOMAIN: $MAIL_DOMAIN
-    network_mode: "host"
-    volumes:
-      ## system (required)
-      - /sys/fs/cgroup:/sys/fs/cgroup:rw
-      ## data (defaults — override in docker-compose.override.yaml)
-      - mail:/home/vmail
-      - dkim:/etc/dkimkeys
-      - certs:/var/lib/acme
-
-volumes:
-  mail:
-  dkim:
-  certs:

docker/build.sh

@@ -1,9 +0,0 @@
-#!/bin/sh
-# Build the chatmail Docker image with the current git hash baked in.
-# Usage: ./docker/build.sh [extra docker-compose build args...]
-#
-# .git/ is excluded from the build context (.dockerignore) so the hash
-# must be passed as a build arg from the host.
-
-export GIT_HASH=$(git rev-parse HEAD)
-exec docker compose build "$@"

docker/chatmail-init.service

@@ -1,14 +0,0 @@
-[Unit]
-Description=Run container setup commands
-After=multi-user.target
-ConditionPathExists=/chatmail-init.sh
-
-[Service]
-Type=oneshot
-ExecStart=/bin/bash /chatmail-init.sh
-RemainAfterExit=true
-WorkingDirectory=/opt/chatmail
-PassEnvironment=<envs_list>
-
-[Install]
-WantedBy=multi-user.target

docker/chatmail-init.sh

@@ -1,87 +0,0 @@
-#!/bin/bash
-
-set -euo pipefail
-export CHATMAIL_INI="${CHATMAIL_INI:-/etc/chatmail/chatmail.ini}"
-export CHATMAIL_NOSYSCTL=True
-export CHATMAIL_NOPORTCHECK=True
-
-CMDEPLOY=/opt/cmdeploy/bin/cmdeploy
-
-if [ -z "$MAIL_DOMAIN" ]; then
-    echo "ERROR: Environment variable 'MAIL_DOMAIN' must be set!" >&2
-    exit 1
-fi
-
-# Generate DKIM keys if not mounted
-if [ ! -f /etc/dkimkeys/opendkim.private ]; then
-    /usr/sbin/opendkim-genkey -D /etc/dkimkeys -d "$MAIL_DOMAIN" -s opendkim
-fi
-# Fix ownership for bind-mounted keys (host opendkim UID may differ from container)
-chown -R opendkim:opendkim /etc/dkimkeys
-
-# Create chatmail.ini, skip if mounted
-mkdir -p "$(dirname "$CHATMAIL_INI")"
-if [ ! -f "$CHATMAIL_INI" ]; then
-    $CMDEPLOY init --config "$CHATMAIL_INI" "$MAIL_DOMAIN"
-fi
-
-# Auto-detect IPv6: if the host has no IPv6 connectivity, set disable_ipv6
-# in the ini so dovecot/postfix/nginx bind to IPv4 only.
-# Uses network_mode:host so /proc/net/if_inet6 reflects the host's stack.
-if [ ! -e /proc/net/if_inet6 ]; then
-    if grep -q '^disable_ipv6 = False' "$CHATMAIL_INI"; then
-        sed -i 's/^disable_ipv6 = False/disable_ipv6 = True/' "$CHATMAIL_INI"
-        echo "[INFO] IPv6 not available, set disable_ipv6 = True"
-    fi
-fi
-
-# Inject external TLS paths from env var unless defined in chatmail.ini
-if [ -n "${TLS_EXTERNAL_CERT_AND_KEY:-}" ]; then
-    if ! grep -q '^tls_external_cert_and_key' "$CHATMAIL_INI"; then
-        echo "tls_external_cert_and_key = $TLS_EXTERNAL_CERT_AND_KEY" >> "$CHATMAIL_INI"
-    fi
-fi
-
-# Ensure mailboxes directory exists (chatmail-metadata needs it at startup,
-# but Dovecot only creates it on first mail delivery)
-mkdir -p "/home/vmail/mail/${MAIL_DOMAIN}"
-chown vmail:vmail "/home/vmail/mail/${MAIL_DOMAIN}"
-
-# --- Deploy fingerprint: skip cmdeploy run if nothing changed ---
-# On restart with identical image+config, systemd already brings up all
-# enabled services only configure+activate are needed here.
-IMAGE_VERSION_FILE="/etc/chatmail-image-version"
-FINGERPRINT_FILE="/etc/chatmail/.deploy-fingerprint"
-image_ver="none"
-[ -f "$IMAGE_VERSION_FILE" ] && image_ver=$(cat "$IMAGE_VERSION_FILE")
-config_hash=$(sha256sum "$CHATMAIL_INI" | cut -c1-16)
-current_fp="${image_ver}:${config_hash}"
-
-# CMDEPLOY_STAGES non-empty in env = operator override -> always run.
-# Otherwise, if fingerprint matches the last successful deploy, skip.
-if [ -z "${CMDEPLOY_STAGES:-}" ] \
-    && [ -f "$FINGERPRINT_FILE" ] \
-    && [ "$(cat "$FINGERPRINT_FILE")" = "$current_fp" ]; then
-    echo "[INFO] No changes detected ($current_fp), skipping deploy."
-else
-    export CMDEPLOY_STAGES="${CMDEPLOY_STAGES:-configure,activate}"
-
-    # Skip DNS check when MAIL_DOMAIN is a bare IP address
-    SKIP_DNS=""
-    if [[ "$MAIL_DOMAIN" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]] || [[ "$MAIL_DOMAIN" =~ : ]]; then
-        SKIP_DNS="--skip-dns-check"
-    fi
-    $CMDEPLOY run --config "$CHATMAIL_INI" --ssh-host @local $SKIP_DNS
-
-    # Restore the build-time hash
-    cp /etc/chatmail-image-version /etc/chatmail-version
-    echo "$current_fp" > "$FINGERPRINT_FILE"
-fi
-
-# Signal success to Docker healthcheck
-touch /run/chatmail-init.done
-
-# Forward journald to console so `docker compose logs` works
-grep -q '^ForwardToConsole=yes' /etc/systemd/journald.conf \
-    || echo "ForwardToConsole=yes" >> /etc/systemd/journald.conf
-systemctl restart systemd-journald

docker/chatmail_relay.dockerfile

@@ -1,101 +0,0 @@
-# syntax=docker/dockerfile:1
-FROM jrei/systemd-debian:12 AS base
-
-ENV LANG=en_US.UTF-8
-
-RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
-    --mount=type=cache,target=/var/lib/apt/lists,sharing=locked \
-    echo 'APT::Install-Recommends "0";' > /etc/apt/apt.conf.d/01norecommend && \
-    echo 'APT::Install-Suggests "0";' >> /etc/apt/apt.conf.d/01norecommend && \
-    apt-get update && \
-    DEBIAN_FRONTEND=noninteractive TZ=UTC \
-    apt-get install -y \
-        ca-certificates \
-        gcc \
-        git \
-        python3 \
-        python3-dev \
-        python3-venv \
-        tzdata \
-        locales && \
-    sed -i -e "s/# $LANG.*/$LANG UTF-8/" /etc/locale.gen && \
-    dpkg-reconfigure --frontend=noninteractive locales && \
-    update-locale LANG=$LANG
-
-# --- Build-time: install cmdeploy venv and run install stage ---
-# Editable install so importlib.resources reads directly from the source tree.
-# On container start only "configure,activate" stages run.
-
-# Copy dependency metadata first so pip install layer is cached
-COPY cmdeploy/pyproject.toml /opt/chatmail/cmdeploy/pyproject.toml
-COPY chatmaild/pyproject.toml /opt/chatmail/chatmaild/pyproject.toml
-
-# Dummy scaffolding so editable install can discover packages
-RUN mkdir -p /opt/chatmail/cmdeploy/src/cmdeploy \
-             /opt/chatmail/chatmaild/src/chatmaild && \
-    touch /opt/chatmail/cmdeploy/src/cmdeploy/__init__.py \
-          /opt/chatmail/chatmaild/src/chatmaild/__init__.py
-
-# Dummy git repo: .git/ is excluded from the build context (.dockerignore)
-# but setuptools calls `git ls-files` when building the sdist.
-WORKDIR /opt/chatmail
-RUN --mount=type=cache,target=/root/.cache/pip \
-    git init -q && \
-    python3 -m venv /opt/cmdeploy && \
-    /opt/cmdeploy/bin/pip install -e chatmaild/ -e cmdeploy/
-
-# Full source copy (editable install's .egg-link still points here)
-COPY . /opt/chatmail/
-
-# Minimal chatmail.ini
-RUN printf '[params]\nmail_domain = build.local\n' > /tmp/chatmail.ini
-
-RUN CMDEPLOY_STAGES=install \
-    CHATMAIL_INI=/tmp/chatmail.ini \
-    CHATMAIL_NOSYSCTL=True \
-    CHATMAIL_NOPORTCHECK=True \
-    /opt/cmdeploy/bin/pyinfra @local \
-        /opt/chatmail/cmdeploy/src/cmdeploy/run.py -y
-
-RUN cp -a www/ /opt/chatmail-www/
-
-# Remove build-only packages and their deps — not needed at runtime
-RUN apt-get purge -y gcc git python3-dev && \
-    apt-get autoremove -y && \
-    rm -f /tmp/chatmail.ini
-
-# Record image version (used in deploy fingerprint at runtime).
-# GIT_HASH is passed as a build arg (from docker-compose or CI) so that
-# .git/ can be excluded from the build context via .dockerignore.
-# Two files: chatmail-image-version is the immutable build hash (survives
-# deploys); chatmail-version is overwritten by cmdeploy run and restored
-# from the image version after each deploy in chatmail-init.sh.
-ARG GIT_HASH=unknown
-RUN echo "$GIT_HASH" > /etc/chatmail-image-version && \
-    echo "$GIT_HASH" > /etc/chatmail-version
-# --- End build-time install ---
-
-ENV TZ=:/etc/localtime
-ENV PATH="/opt/cmdeploy/bin:${PATH}"
-RUN ln -s /etc/chatmail/chatmail.ini /opt/chatmail/chatmail.ini
-
-ARG CHATMAIL_INIT_SERVICE_PATH=/lib/systemd/system/chatmail-init.service
-COPY ./docker/chatmail-init.service "$CHATMAIL_INIT_SERVICE_PATH"
-RUN ln -sf "$CHATMAIL_INIT_SERVICE_PATH" "/etc/systemd/system/multi-user.target.wants/chatmail-init.service"
-
-# Remove default nginx site config at build time (not in entrypoint)
-RUN rm -f /etc/nginx/sites-enabled/default
-
-COPY --chmod=555 ./docker/chatmail-init.sh /chatmail-init.sh
-COPY --chmod=555 ./docker/entrypoint.sh /entrypoint.sh
-COPY --chmod=555 ./docker/healthcheck.sh /healthcheck.sh
-
-HEALTHCHECK --interval=10s --start-period=180s --timeout=10s --retries=3 \
-  CMD /healthcheck.sh
-
-STOPSIGNAL SIGRTMIN+3
-
-ENTRYPOINT ["/entrypoint.sh"]
-
-CMD [   "--default-standard-output=journal+console", \
-        "--default-standard-error=journal+console" ]

docker/docker-compose.ci.yaml

@@ -1,11 +0,0 @@
-# Used by .github/workflows/docker-ci.yaml
-# The GHCR image is set via CHATMAIL_IMAGE env var at deploy time.
-services:
-  chatmail:
-    image: ${CHATMAIL_IMAGE:-chatmail-relay:latest}
-    volumes:
-      - /srv/chatmail/chatmail.ini:/etc/chatmail/chatmail.ini
-      - /srv/chatmail/dkim:/etc/dkimkeys
-      - /srv/chatmail/certs:/var/lib/acme
-    environment:
-      TLS_EXTERNAL_CERT_AND_KEY: /var/lib/acme/live/${MAIL_DOMAIN}/fullchain /var/lib/acme/live/${MAIL_DOMAIN}/privkey

docker/entrypoint.sh

@@ -1,9 +0,0 @@
-#!/bin/bash
-set -eo pipefail
-
-CHATMAIL_INIT_SERVICE_PATH="${CHATMAIL_INIT_SERVICE_PATH:-/lib/systemd/system/chatmail-init.service}"
-
-env_vars="MAIL_DOMAIN CMDEPLOY_STAGES CHATMAIL_INI TLS_EXTERNAL_CERT_AND_KEY PATH"
-sed -i "s|<envs_list>|$env_vars|g" "$CHATMAIL_INIT_SERVICE_PATH"
-
-exec /lib/systemd/systemd "$@"

docker/healthcheck.sh

@@ -1,16 +0,0 @@
-#!/bin/bash
-# returns 0 when chatmail-init succeeded and all expected services are running.
-
-set -e
-
-test -f /run/chatmail-init.done
-
-# Core services
-services="chatmail-metadata doveauth dovecot filtermail filtermail-incoming nginx postfix unbound"
-
-# Optional services
-for svc in iroh-relay turnserver; do
-    systemctl is-enabled "$svc" 2>/dev/null && services="$services $svc"
-done
-
-exec systemctl is-active $services

env.example

@@ -1 +0,0 @@
-MAIL_DOMAIN=chat.example.com

filtermail/CHANGELOG.md

@@ -0,0 +1,291 @@
+## 0.7.4 - 2026-07-01
+
+### Features
+
+- *(logs)* Log incoming mailer-daemon message sources (#191)
+
+### Miscellaneous Tasks
+
+- Update filtermail.mtail (#190)
+
+### Testing
+
+- Place #[tokio::test] after rstest case macros (#192)
+## 0.7.3 - 2026-06-27
+
+### Features
+
+- *(transport)* Worker eviction (#185)
+## 0.7.2 - 2026-06-26
+
+### Documentation
+
+- *(readme)* Disable colors in mermaid diagrams (#180)
+- *(readme)* Update Transport mode doc
+
+### Features
+
+- *(transport)* Destination worker pool
+
+### Refactor
+
+- Implement Display for AddressDomain
+
+### Testing
+
+- Test filtermail-transport
+## 0.7.1 - 2026-06-09
+
+### Bug Fixes
+
+- Switch ratelimiter to MonotonicClock (#167)
+- *(smtp-server)* Correct error when EOF while reading DATA (#168)
+- *(resolver)* Disable negative caching (#170)
+- Ignore CNAME records when resolving TXT records (#177)
+
+### Features
+
+- Switch to aws-lc-rs cryptography provider (#178)
+
+### Miscellaneous Tasks
+
+- Add filtermail.mtail so filtermail failures can be monitored (#169)
+## 0.7.0 - 2026-05-26
+
+### Bug Fixes
+
+- Do not crash if accepting new connection fails
+
+### Documentation
+
+- *(readme)* Remove docs for options removed in da9a116 (#162)
+
+### Features
+
+- [**breaking**] Remove passthrough options that allowed unencrypted mail to pass
+## 0.6.6 - 2026-05-12
+
+### Bug Fixes
+
+- Return HTTP 200 because madmail expects it, and make sure https is immediately retried when SMTP fails (#153)
+
+### Features
+
+- Improved SMTP error responses (#147)
+
+### Miscellaneous Tasks
+
+- Remove mac and windows from matrix tests (#154)
+- Run cmlxc tests in all classic/classic-ipv4/madmail combinations
+## 0.6.5 - 2026-05-12
+
+### Bug Fixes
+
+- *(smtp-client)* Handle 421 on reused connection (#145)
+- Advertise 8BITMIME to prevent conversion after DKIM signing (#149)
+- Validate mail data (#150)
+
+### Miscellaneous Tasks
+
+- Build and deploy relays with filtermail binary and run interop tests against madmail  (#131)
+
+### Performance
+
+- *(smtp-client)* Use pipelining if server advertises support (#146)
+## 0.6.4 - 2026-05-01
+
+### Bug Fixes
+
+- Implement missing "implicit MX" rule
+
+### Features
+
+- Https transport channel (#122)
+
+### Refactor
+
+- *(transport)* Explicitly handle RFC7505 null MX
+## 0.6.3 - 2026-04-20
+
+### Features
+
+- *(smtp-server)* Log malformed SMTP commands (#118)
+
+### Performance
+
+- *(smtp-client)* Cache connections (#117)
+## 0.6.2 - 2026-04-16
+
+### Documentation
+
+- *(readme)* Reformat README.md (#115)
+
+### Features
+
+- Log disabled recipients (#113)
+- *(transport)* Remote delivery over SMTP (#104)
+
+### Miscellaneous Tasks
+
+- *(dependabot)* Update configuration (#114)
+## 0.6.1 - 2026-04-01
+
+### Documentation
+
+- *(readme)* Fix typo (#99)
+
+### Features
+
+- Configurable hosts for listen and reinject (#84)
+- *(resolver)* Enable DNSSEC (#94)
+- Add experimental option to disable mailboxes (#108)
+
+### Refactor
+
+- Derive Default for Envelope (#100)
+## 0.6.0 - 2026-03-13
+
+### Documentation
+
+- *(readme)* Fix license link
+- *(readme)* Clarify licensing of the binaries
+- *(readme)* Improve README.md (#88)
+
+### Features
+
+- [**breaking**] Remove IP verification for domain-literals (#90)
+
+### Miscellaneous Tasks
+
+- *(ci)* Fix binary publish job (#79)
+
+### Refactor
+
+- Use enum for mode cli arg (#83)
+## 0.5.2 - 2026-02-27
+
+### Bug Fixes
+
+- *(logs)* Log correct address for outbound messages (#70)
+
+### Features
+
+- Check incoming email return address (#72)
+
+### Miscellaneous Tasks
+
+- Bump cargo-dist (#73)
+- *(ci)* Build and upload binaries in CI (#76)
+- *(ci)* Add missing Zig dependency (#77)
+
+### Refactor
+
+- Check if email is encrypted before verifying DKIM (#71)
+## 0.5.1 - 2026-02-24
+
+### Bug Fixes
+
+- *(dkim)* Accept TXT records with no `v=` tag (#62)
+- *(smtp)* Properly handle bounce messages (#63)
+- *(dkim)* Accept TXT records with escaped quotes (#61)
+- *(logs)* Log `From` address instead of envelope `MAIL FROM`. (#66)
+## 0.5.0 - 2026-02-20
+
+### Bug Fixes
+
+- *(dkim)* Make simple header canonicalization work properly (#53)
+
+### Features
+
+- Save rejected messages to `/tmp` (#55)
+
+### Refactor
+
+- Do not copy the mail in memory for DKIM verification (#54)
+## 0.4.1 - 2026-02-17
+
+### Miscellaneous Tasks
+
+- *(tests)* Add a way to disable DKIM for tests (#50)
+## 0.4.0 - 2026-02-17
+
+### Features
+
+- [**breaking**] DKIM verifier (#35)
+- Support addresses using domain literals (#42)
+## 0.3.0 - 2026-02-14
+
+### Features
+
+- Support legacy, pre-OpenPGP packet format (#44)
+
+### Miscellaneous Tasks
+
+- *(dist)* Switch to musl targets (#31)
+
+### Refactor
+
+- Remove unnecessary Arc (#36)
+- Use a custom, minimal SMTP client instead of lettre (#33)
+## 0.2.0 - 2026-01-28
+
+### Features
+
+- Configurable rate limiter max burst size (#28)
+
+### Performance
+
+- Disable Nagle's algorithm and do own buffering on server connections
+
+### Refactor
+
+- Remove Mutex around rate limiter
+## 0.1.2 - 2026-01-22
+
+### Bug Fixes
+
+- Set logs required by grafana to INFO (#21)
+- Make inbound/outbound log messages consistent (#23)
+
+### Performance
+
+- Use governor for rate limiting (#20)
+## 0.1.1 - 2026-01-21
+
+### Bug Fixes
+
+- Improve address extraction from SMTP commands (#14)
+- Correct a typo in SMTP answer (#11)
+- *(config)* Set default values for internal SMTP ports and max message size (#12)
+
+### Features
+
+- Improve logging (#13)
+
+### Miscellaneous Tasks
+
+- *(dist)* Configure cargo-dist (#10)
+- Configure git-cliff
+
+### Refactor
+
+- Get rid of indexing and slicing in check_armored_payload() (#15)
+- Apply more lints (#17)
+## 0.1.0 - 2026-01-19
+
+### Documentation
+
+- *(readme)* Add README.md
+- *(license)* Add LICENSE
+
+### Features
+
+- Initial implementation
+
+### Miscellaneous Tasks
+
+- Init repository
+- *(dependabot)* Setup dependabot
+- *(ci)* Setup CI
+- *(dependabot)* Add github-actions to dependabot
+- *(cargo)* Add metadata