diff --git a/.github/workflows/docker-build.yaml b/.github/workflows/docker-build.yaml
deleted file mode 100644
index 23736a49..00000000
--- a/.github/workflows/docker-build.yaml
+++ /dev/null
@@ -1,76 +0,0 @@
-name: Docker Build
-
-on:
-  pull_request:
-    paths:
-      - 'docker/**'
-      - 'docker-compose.yaml'
-      - '.dockerignore'
-      - 'chatmaild/**'
-      - 'cmdeploy/**'
-      - '.github/workflows/docker-build.yaml'
-  push:
-    branches:
-      - main
-      - j4n/docker-pr
-    paths:
-      - 'docker/**'
-      - 'docker-compose.yaml'
-      - '.dockerignore'
-      - 'chatmaild/**'
-      - 'cmdeploy/**'
-      - '.github/workflows/docker-build.yaml'
-    tags:
-      - 'v*'
-
-env:
-  REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
-
-jobs:
-  build:
-    name: Build Docker image
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-    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: j4n/docker → :j4n-docker
-            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 }}
diff --git a/.github/workflows/test-and-deploy-docker-ipv4only.yaml b/.github/workflows/test-and-deploy-docker-ipv4only.yaml
deleted file mode 100644
index 741121c2..00000000
--- a/.github/workflows/test-and-deploy-docker-ipv4only.yaml
+++ /dev/null
@@ -1,144 +0,0 @@
-name: deploy Docker on staging-ipv4.testrun.org, and run tests
-
-on:
-  push:
-    branches:
-      - main
-      - j4n/docker-pr
-    paths:
-      - 'docker/**'
-      - 'docker-compose.yaml'
-      - '.dockerignore'
-      - 'chatmaild/**'
-      - 'cmdeploy/**'
-      - '.github/workflows/test-and-deploy-docker-ipv4only.yaml'
-
-jobs:
-  deploy:
-    name: deploy Docker on staging-ipv4.testrun.org, and run tests
-    runs-on: ubuntu-latest
-    timeout-minutes: 30
-    environment:
-      name: staging-ipv4.testrun.org
-      url: https://staging-ipv4.testrun.org/
-    concurrency: staging-ipv4.testrun.org
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: prepare SSH
-        run: |
-          mkdir ~/.ssh
-          echo "${{ secrets.STAGING_SSH_KEY }}" >> ~/.ssh/id_ed25519
-          chmod 600 ~/.ssh/id_ed25519
-          ssh-keyscan staging-ipv4.testrun.org > ~/.ssh/known_hosts
-          # save previous acme & dkim state
-          rsync -avz root@staging-ipv4.testrun.org:/var/lib/acme acme-ipv4 || true
-          rsync -avz root@staging-ipv4.testrun.org:/etc/dkimkeys dkimkeys-ipv4 || true
-          # store previous acme & dkim state on ns.testrun.org, if it contains useful certs
-          if [ -f dkimkeys-ipv4/dkimkeys/opendkim.private ]; then rsync -avz -e "ssh -o StrictHostKeyChecking=accept-new" dkimkeys-ipv4 root@ns.testrun.org:/tmp/ || true; fi
-          if [ "$(ls -A acme-ipv4/acme/certs)" ]; then rsync -avz -e "ssh -o StrictHostKeyChecking=accept-new" acme-ipv4 root@ns.testrun.org:/tmp/ || true; fi
-          # make sure CAA record isn't set
-          scp -o StrictHostKeyChecking=accept-new .github/workflows/staging-ipv4.testrun.org-default.zone root@ns.testrun.org:/etc/nsd/staging-ipv4.testrun.org.zone
-          ssh root@ns.testrun.org sed -i '/CAA/d' /etc/nsd/staging-ipv4.testrun.org.zone
-          ssh root@ns.testrun.org nsd-checkzone staging-ipv4.testrun.org /etc/nsd/staging-ipv4.testrun.org.zone
-          ssh root@ns.testrun.org systemctl reload nsd
-
-      - name: rebuild staging-ipv4.testrun.org to have a clean VPS
-        run: |
-            curl -X POST \
-            -H "Authorization: Bearer ${{ secrets.HETZNER_API_TOKEN }}" \
-            -H "Content-Type: application/json" \
-            -d '{"image":"debian-12"}' \
-            "https://api.hetzner.cloud/v1/servers/${{ secrets.STAGING_IPV4_SERVER_ID }}/actions/rebuild"
-
-      - run: scripts/initenv.sh
-      - name: append venv/bin to PATH
-        run: echo venv/bin >>$GITHUB_PATH
-
-      - name: wait for VPS rebuild
-        run: |
-          rm ~/.ssh/known_hosts
-          while ! ssh -o ConnectTimeout=180 -o StrictHostKeyChecking=accept-new root@staging-ipv4.testrun.org id -u ; do sleep 1 ; done
-
-      - name: install Docker on VPS
-        run: |
-          ssh root@staging-ipv4.testrun.org 'apt-get update && apt-get install -y ca-certificates curl'
-          ssh root@staging-ipv4.testrun.org 'install -m 0755 -d /etc/apt/keyrings'
-          ssh root@staging-ipv4.testrun.org 'curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc && chmod a+r /etc/apt/keyrings/docker.asc'
-          ssh root@staging-ipv4.testrun.org 'echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian $(. /etc/os-release && echo $VERSION_CODENAME) stable" > /etc/apt/sources.list.d/docker.list'
-          ssh root@staging-ipv4.testrun.org 'apt-get update && apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin'
-
-      - name: restore ACME & DKIM state
-        run: |
-          rsync -e "ssh -o StrictHostKeyChecking=accept-new" -avz root@ns.testrun.org:/tmp/acme-ipv4/acme acme-restore || true
-          rsync -avz root@ns.testrun.org:/tmp/dkimkeys-ipv4/dkimkeys dkimkeys-restore || true
-          ssh root@staging-ipv4.testrun.org mkdir -p /srv/chatmail/dkim /srv/chatmail/certs
-          rsync -avz acme-restore/acme/ root@staging-ipv4.testrun.org:/srv/chatmail/certs/ || true
-          rsync -avz dkimkeys-restore/dkimkeys/ root@staging-ipv4.testrun.org:/srv/chatmail/dkim/ || true
-
-      - name: generate chatmail.ini with disable_ipv6
-        run: |
-          cmdeploy init staging-ipv4.testrun.org
-          sed -i 's/disable_ipv6 = False/disable_ipv6 = True/' chatmail.ini
-          sed -i 's/#\s*mtail_address/mtail_address/' chatmail.ini
-          scp chatmail.ini root@staging-ipv4.testrun.org:/srv/chatmail/chatmail.ini
-
-      - name: upload repo and deploy with Docker
-        run: |
-          SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-7)
-          GHCR_IMAGE="ghcr.io/$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]'):sha-${SHORT_SHA}"
-          rsync -avz --exclude='.git' --exclude='venv' --exclude='__pycache__' ./ root@staging-ipv4.testrun.org:/srv/chatmail/relay/
-          # Override: bind-mount data dirs + custom chatmail.ini + pre-built image
-          ssh root@staging-ipv4.testrun.org "cat > /srv/chatmail/relay/docker-compose.override.yaml << EOF
-          services:
-            chatmail:
-              image: ${GHCR_IMAGE}
-              volumes:
-                - /srv/chatmail/dkim:/etc/dkimkeys
-                - /srv/chatmail/certs:/var/lib/acme
-                - /srv/chatmail/chatmail.ini:/etc/chatmail/chatmail.ini
-          EOF"
-          # Pull pre-built image from GHCR (falls back to local build if unavailable)
-          if ssh root@staging-ipv4.testrun.org "docker pull ${GHCR_IMAGE}"; then
-            ssh root@staging-ipv4.testrun.org 'cd /srv/chatmail/relay && MAIL_DOMAIN=staging-ipv4.testrun.org docker compose up -d'
-          else
-            echo "::warning::Pre-built image not available, building locally"
-            ssh root@staging-ipv4.testrun.org 'cd /srv/chatmail/relay && MAIL_DOMAIN=staging-ipv4.testrun.org GIT_HASH=${{ github.sha }} docker compose up -d --build'
-          fi
-
-      - name: wait for container to become healthy
-        run: |
-          for i in $(seq 1 60); do
-            status=$(ssh root@staging-ipv4.testrun.org '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
-            sleep 5
-          done
-          echo "Container did not become healthy in time."
-          ssh root@staging-ipv4.testrun.org 'cd /srv/chatmail/relay && docker compose logs --tail=200'
-          exit 1
-
-      - name: run deploy-chatmail offline tests
-        run: pytest --pyargs cmdeploy
-
-      - name: set DNS entries
-        run: |
-          ssh root@staging-ipv4.testrun.org chown opendkim:opendkim -R /srv/chatmail/dkim
-          ssh root@staging-ipv4.testrun.org 'docker exec chatmail cmdeploy dns --ssh-host @local --zonefile /tmp/staging.zone --verbose'
-          ssh root@staging-ipv4.testrun.org 'docker cp chatmail:/tmp/staging.zone /tmp/staging.zone'
-          scp root@staging-ipv4.testrun.org:/tmp/staging.zone staging-generated.zone
-          cat staging-generated.zone >> .github/workflows/staging-ipv4.testrun.org-default.zone
-          cat .github/workflows/staging-ipv4.testrun.org-default.zone
-          scp .github/workflows/staging-ipv4.testrun.org-default.zone root@ns.testrun.org:/etc/nsd/staging-ipv4.testrun.org.zone
-          ssh root@ns.testrun.org nsd-checkzone staging-ipv4.testrun.org /etc/nsd/staging-ipv4.testrun.org.zone
-          ssh root@ns.testrun.org systemctl reload nsd
-
-      - name: cmdeploy test
-        run: CHATMAIL_DOMAIN2=ci-chatmail.testrun.org cmdeploy test --slow
-
-      - name: cmdeploy dns
-        run: |
-          ssh root@staging-ipv4.testrun.org 'docker exec chatmail cmdeploy dns -v --ssh-host @local'
diff --git a/.github/workflows/test-and-deploy-docker.yaml b/.github/workflows/test-and-deploy-docker.yaml
deleted file mode 100644
index d175ab46..00000000
--- a/.github/workflows/test-and-deploy-docker.yaml
+++ /dev/null
@@ -1,149 +0,0 @@
-name: deploy dockerized chatmail on staging2.testrun.org, and run tests
-
-on:
-  push:
-    branches:
-      - main
-      - j4n/docker-pr
-    paths:
-      - 'docker/**'
-      - 'docker-compose.yaml'
-      - '.dockerignore'
-      - 'chatmaild/**'
-      - 'cmdeploy/**'
-      - '.github/workflows/test-and-deploy-docker.yaml'
-
-jobs:
-  deploy:
-    name: deploy dockerized chatmail on staging2.testrun.org, and run tests
-    runs-on: ubuntu-latest
-    timeout-minutes: 30
-    environment:
-      name: staging2.testrun.org
-      url: https://staging2.testrun.org/
-    concurrency: staging2.testrun.org
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: prepare SSH
-        run: |
-          mkdir ~/.ssh
-          echo "${{ secrets.STAGING_SSH_KEY }}" >> ~/.ssh/id_ed25519
-          chmod 600 ~/.ssh/id_ed25519
-          ssh-keyscan staging2.testrun.org > ~/.ssh/known_hosts
-          # save previous acme & dkim state
-          rsync -avz root@staging2.testrun.org:/var/lib/acme . || true
-          rsync -avz root@staging2.testrun.org:/etc/dkimkeys . || true
-          # store previous acme & dkim state on ns.testrun.org, if it contains useful certs
-          if [ -f dkimkeys/opendkim.private ]; then rsync -avz -e "ssh -o StrictHostKeyChecking=accept-new" dkimkeys root@ns.testrun.org:/tmp/ || true; fi
-          if [ "$(ls -A acme/certs)" ]; then rsync -avz -e "ssh -o StrictHostKeyChecking=accept-new" acme root@ns.testrun.org:/tmp/ || true; fi
-          # make sure CAA record isn't set
-          scp -o StrictHostKeyChecking=accept-new .github/workflows/staging.testrun.org-default.zone root@ns.testrun.org:/etc/nsd/staging2.testrun.org.zone
-          ssh root@ns.testrun.org sed -i '/CAA/d' /etc/nsd/staging2.testrun.org.zone
-          ssh root@ns.testrun.org nsd-checkzone staging2.testrun.org /etc/nsd/staging2.testrun.org.zone
-          ssh root@ns.testrun.org systemctl reload nsd
-
-      - name: rebuild staging2.testrun.org to have a clean VPS
-        run: |
-            curl -X POST \
-            -H "Authorization: Bearer ${{ secrets.HETZNER_API_TOKEN }}" \
-            -H "Content-Type: application/json" \
-            -d '{"image":"debian-12"}' \
-            "https://api.hetzner.cloud/v1/servers/${{ secrets.STAGING_SERVER_ID }}/actions/rebuild"
-
-      - name: wait for VPS rebuild
-        run: |
-          rm ~/.ssh/known_hosts
-          while ! ssh -o ConnectTimeout=180 -o StrictHostKeyChecking=accept-new root@staging2.testrun.org id -u ; do sleep 1 ; done
-
-      - run: scripts/initenv.sh
-      - name: append venv/bin to PATH
-        run: echo venv/bin >>$GITHUB_PATH
-
-      - name: install Docker on VPS
-        run: |
-          ssh root@staging2.testrun.org 'apt-get update && apt-get install -y ca-certificates curl'
-          ssh root@staging2.testrun.org 'install -m 0755 -d /etc/apt/keyrings'
-          ssh root@staging2.testrun.org 'curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc && chmod a+r /etc/apt/keyrings/docker.asc'
-          ssh root@staging2.testrun.org 'echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian $(. /etc/os-release && echo $VERSION_CODENAME) stable" > /etc/apt/sources.list.d/docker.list'
-          ssh root@staging2.testrun.org 'apt-get update && apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin'
-
-      - name: restore ACME & DKIM state
-        run: |
-          # download from ns.testrun.org
-          rsync -e "ssh -o StrictHostKeyChecking=accept-new" -avz root@ns.testrun.org:/tmp/acme acme-restore || true
-          rsync -avz root@ns.testrun.org:/tmp/dkimkeys dkimkeys-restore || true
-          # restore to VPS host paths (will be bind-mounted into container)
-          ssh root@staging2.testrun.org mkdir -p /srv/chatmail/dkim /srv/chatmail/certs
-          rsync -avz acme-restore/acme/ root@staging2.testrun.org:/srv/chatmail/certs/ || true
-          rsync -avz dkimkeys-restore/dkimkeys/ root@staging2.testrun.org:/srv/chatmail/dkim/ || true
-
-      - name: generate chatmail.ini
-        run: |
-          cmdeploy init staging2.testrun.org
-          sed -i 's/#\s*mtail_address/mtail_address/' chatmail.ini
-          scp chatmail.ini root@staging2.testrun.org:/srv/chatmail/chatmail.ini
-
-      - name: upload repo and deploy with Docker
-        run: |
-          SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-7)
-          GHCR_IMAGE="ghcr.io/$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]'):sha-${SHORT_SHA}"
-          rsync -avz --exclude='.git' --exclude='venv' --exclude='__pycache__' ./ root@staging2.testrun.org:/srv/chatmail/relay/
-          # Override: bind-mount data dirs + custom chatmail.ini + pre-built image
-          ssh root@staging2.testrun.org "cat > /srv/chatmail/relay/docker-compose.override.yaml << EOF
-          services:
-            chatmail:
-              image: ${GHCR_IMAGE}
-              volumes:
-                - /srv/chatmail/dkim:/etc/dkimkeys
-                - /srv/chatmail/certs:/var/lib/acme
-                - /srv/chatmail/chatmail.ini:/etc/chatmail/chatmail.ini
-          EOF"
-          # Pull pre-built image from GHCR (falls back to local build if unavailable)
-          if ssh root@staging2.testrun.org "docker pull ${GHCR_IMAGE}"; then
-            ssh root@staging2.testrun.org 'cd /srv/chatmail/relay && MAIL_DOMAIN=staging2.testrun.org docker compose up -d'
-          else
-            echo "::warning::Pre-built image not available, building locally"
-            ssh root@staging2.testrun.org 'cd /srv/chatmail/relay && MAIL_DOMAIN=staging2.testrun.org GIT_HASH=${{ github.sha }} docker compose up -d --build'
-          fi
-
-      - name: wait for container to become healthy
-        run: |
-          for i in $(seq 1 60); do
-            status=$(ssh root@staging2.testrun.org '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
-            sleep 5
-          done
-          echo "Container did not become healthy in time."
-          ssh root@staging2.testrun.org 'cd /srv/chatmail/relay && docker compose logs --tail=200'
-          exit 1
-
-      - name: add hpk42 key to staging server
-        run: ssh root@staging2.testrun.org 'curl -s https://github.com/hpk42.keys >> .ssh/authorized_keys'
-
-      - name: run deploy-chatmail offline tests
-        run: pytest --pyargs cmdeploy
-
-      - name: set DNS entries
-        run: |
-          ssh root@staging2.testrun.org chown opendkim:opendkim -R /srv/chatmail/dkim
-          # run cmdeploy dns inside the container
-          ssh root@staging2.testrun.org 'docker exec chatmail cmdeploy dns --ssh-host @local --zonefile /tmp/staging.zone --verbose'
-          ssh root@staging2.testrun.org 'docker cp chatmail:/tmp/staging.zone /tmp/staging.zone'
-          scp root@staging2.testrun.org:/tmp/staging.zone staging-generated.zone
-          cat staging-generated.zone >> .github/workflows/staging.testrun.org-default.zone
-          cat .github/workflows/staging.testrun.org-default.zone
-          scp .github/workflows/staging.testrun.org-default.zone root@ns.testrun.org:/etc/nsd/staging2.testrun.org.zone
-          ssh root@ns.testrun.org nsd-checkzone staging2.testrun.org /etc/nsd/staging2.testrun.org.zone
-          ssh root@ns.testrun.org systemctl reload nsd
-
-      - name: cmdeploy test
-        run: CHATMAIL_DOMAIN2=ci-chatmail.testrun.org cmdeploy test --slow
-
-      - name: cmdeploy dns
-        run: |
-          ssh root@staging2.testrun.org 'docker exec chatmail cmdeploy dns -v --ssh-host @local'