fix sha256 checksums

* doc: added maddy-chatmail to README

* Update README.md

Co-authored-by: holger krekel  <holger@merlinux.eu>

---------

Co-authored-by: holger krekel <holger@merlinux.eu>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,33 @@
+---
+name: Bug report
+about: Report something that isn't working.
+title: ''
+assignees: ''
+
+---
+
+<!--
+Please fill out as much of this form as you can (leaving out stuff that is not applicable is ok).
+-->
+
+- Server OS (Operating System) - preferably Debian 12: 
+- On which OS you run cmdeploy:
+- chatmail/relay version: `git rev-parse HEAD`
+
+## Expected behavior
+
+*What did you try to achieve?*
+
+## Actual behavior
+
+*What happened instead?*
+
+### Steps to reproduce the problem:
+
+1. 
+2.
+
+### Screenshots
+
+### Logs
+

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: true
+contact_links:
+  - name: Mutual Help Chat Group
+    url: https://i.delta.chat/#C2846EB4C1CB8DF84B1818F5E3A638FC3FBDC981&a=stalebot1%40nine.testrun.org&g=Chatmail%20Mutual%20Help&x=7sFF7Ik50pWv6J1z7RVC5527&i=d7s1HvOsk5UrSf9AoqRZggg4&s=XmX_9BAW6-g5Ao5E8PyaeKNB
+    about: If you have troubles setting up the relay server, feel free to ask here.

.github/workflows/ci.yaml

@@ -10,6 +10,10 @@ jobs:
     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.
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: run chatmaild tests 
         working-directory: chatmaild

.github/workflows/test-and-deploy-ipv4only.yaml

@@ -38,7 +38,9 @@ jobs:
           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
-          ssh -o StrictHostKeyChecking=accept-new root@ns.testrun.org sed -i '/CAA/d' /etc/nsd/staging-ipv4.testrun.org.zone
+          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
@@ -47,7 +49,7 @@ jobs:
             -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"
+            "https://api.hetzner.cloud/v1/servers/${{ secrets.STAGING_IPV4_SERVER_ID }}/actions/rebuild"
 
       - run: scripts/initenv.sh
 
@@ -61,11 +63,11 @@ jobs:
           while ! ssh -o ConnectTimeout=180 -o StrictHostKeyChecking=accept-new -v root@staging-ipv4.testrun.org id -u ; do sleep 1 ; done
           ssh -o StrictHostKeyChecking=accept-new -v root@staging-ipv4.testrun.org id -u
           # download acme & dkim state from ns.testrun.org
-          rsync -e "ssh -o StrictHostKeyChecking=accept-new" -avz root@ns.testrun.org:/tmp/acme-ipv4 acme-restore || true
+          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-restore || true
+          rsync -avz root@ns.testrun.org:/tmp/dkimkeys-ipv4/dkimkeys dkimkeys-restore || true
           # restore acme & dkim state to staging2.testrun.org
-          rsync -avz acme-restore/acme-ipv4/acme root@staging-ipv4.testrun.org:/var/lib/acme || true
+          rsync -avz acme-restore/acme root@staging-ipv4.testrun.org:/var/lib/ || true
-          rsync -avz dkimkeys-restore/dkimkeys-ipv4/dkimkeys root@staging-ipv4.testrun.org:/etc/dkimkeys || true
+          rsync -avz dkimkeys-restore/dkimkeys root@staging-ipv4.testrun.org:/etc/ || true
           ssh -o StrictHostKeyChecking=accept-new -v root@staging-ipv4.testrun.org chown root:root -R /var/lib/acme || true
 
       - name: run formatting checks 
@@ -93,6 +95,6 @@ jobs:
       - name: cmdeploy test
         run: CHATMAIL_DOMAIN2=nine.testrun.org cmdeploy test --slow
 
-      - name: cmdeploy dns (try 3 times)
+      - name: cmdeploy dns
-        run: cmdeploy dns || cmdeploy dns || cmdeploy dns
+        run: cmdeploy dns -v
 

.github/workflows/test-and-deploy.yaml

@@ -38,7 +38,9 @@ jobs:
           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
-          ssh -o StrictHostKeyChecking=accept-new root@ns.testrun.org sed -i '/CAA/d' /etc/nsd/staging2.testrun.org.zone
+          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
@@ -64,8 +66,8 @@ jobs:
           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 acme & dkim state to staging2.testrun.org
-          rsync -avz acme-restore/acme/ root@staging2.testrun.org:/var/lib/acme || true
+          rsync -avz acme-restore/acme root@staging2.testrun.org:/var/lib/ || true
-          rsync -avz dkimkeys-restore/dkimkeys/ root@staging2.testrun.org:/etc/dkimkeys || true
+          rsync -avz dkimkeys-restore/dkimkeys root@staging2.testrun.org:/etc/ || true
           ssh -o StrictHostKeyChecking=accept-new -v root@staging2.testrun.org chown root:root -R /var/lib/acme || true
 
       - name: run formatting checks 
@@ -91,6 +93,6 @@ jobs:
       - name: cmdeploy test
         run: CHATMAIL_DOMAIN2=nine.testrun.org cmdeploy test --slow
 
-      - name: cmdeploy dns (try 3 times)
+      - name: cmdeploy dns
-        run: cmdeploy dns -v || cmdeploy dns -v || cmdeploy dns -v
+        run: cmdeploy dns -v
 

CHANGELOG.md

@@ -1,158 +1,360 @@
 # Changelog for chatmail deployment 
 
+## untagged
+
+- Expire push notification tokens after 90 days
+  ([#583](https://github.com/chatmail/relay/pull/583))
+
+- Use official `mtail` binary instead of `mtail` package
+  ([#581](https://github.com/chatmail/relay/pull/581))
+
+- dovecot: install from download.delta.chat instead of openSUSE Build Service
+  ([#590](https://github.com/chatmail/relay/pull/590))
+
+- Reconfigure Dovecot imap-login service to high-performance mode
+  ([#578](https://github.com/chatmail/relay/pull/578))
+
+- Set timezone to improve dovecot performance
+  ([#584](https://github.com/chatmail/relay/pull/584))
+
+- Increase nginx connection limits
+  ([#576](https://github.com/chatmail/relay/pull/576))
+
+- If `dns-utils` needs to be installed before cmdeploy run, apt update to make sure it works
+  ([#560](https://github.com/chatmail/relay/pull/560))
+
+- filtermail: respect config message size limit
+  ([#572](https://github.com/chatmail/relay/pull/572))
+
+- Add config value after how many days large files are deleted
+  ([#555](https://github.com/chatmail/relay/pull/555))
+
+- cmdeploy: push relay version to /etc/chatmail-version
+  ([#573](https://github.com/chatmail/relay/pull/573))
+
+- filtermail: allow partial body length in OpenPGP payloads
+  ([#570](https://github.com/chatmail/relay/pull/570))
+
+- chatmaild: allow echobot to receive unencrypted messages by default
+  ([#556](https://github.com/chatmail/relay/pull/556))
+
+
+## 1.6.0 2025-04-11
+
+- Handle Port-25 connect errors more gracefully (common with VPNs)
+  ([#552](https://github.com/chatmail/relay/pull/552))
+
+- Avoid "acmetool not found" during initial run
+  ([#550](https://github.com/chatmail/relay/pull/550))
+
+- Fix timezone handling such that client/servers do not need to use
+  same timezone. 
+  ([#553](https://github.com/chatmail/relay/pull/553))
+
+- Enforce end-to-end encryption for incoming messages. 
+  New user address mailboxes now get a `enforceE2EEincoming` file 
+  which prohibits incoming cleartext messages from other domains. 
+  An outside MTA trying to submit a cleartext message will 
+  get a "523 Encryption Needed" response, see RFC5248. 
+  If the file does not exist (as it the case for all existing accounts) 
+  incoming cleartext messages are accepted. 
+  ([#538](https://github.com/chatmail/server/pull/538))
+
+- Enforce end-to-end encryption between local addresses 
+  ([#535](https://github.com/chatmail/server/pull/535))
+
+- unbound: check that port 53 is not occupied by a different process
+  ([#537](https://github.com/chatmail/server/pull/537))
+
+- unbound: before unbound is there, use 9.9.9.9 for resolving
+  ([#518](https://github.com/chatmail/relay/pull/518))
+
+- Limit the bind for the HTTPS server on 8443 to 127.0.0.1 
+  ([#522](https://github.com/chatmail/server/pull/522))
+  ([#532](https://github.com/chatmail/server/pull/532))
+
+- Send SNI when connecting to outside servers
+  ([#524](https://github.com/chatmail/server/pull/524))
+
+- postfix master.cf: use 127.0.0.1 for consistency
+  ([#544](https://github.com/chatmail/relay/pull/544))
+
+- Pass through `original_content` instead of `content` in filtermail
+  ([#509](https://github.com/chatmail/server/pull/509))
+
+- Document TLS requirements in the readme
+  ([#514](https://github.com/chatmail/server/pull/514))
+
+- Remove cleanup service from submission ports
+  ([#512](https://github.com/chatmail/server/pull/512))
+
+- cmdeploy dovecot: delete big messages after 7 days
+  ([#504](https://github.com/chatmail/server/pull/504))
+
+- mtail: fix getting logs from STDIN
+  ([#502](https://github.com/chatmail/server/pull/502))
+
+- filtermail: don't require exactly 2 lines after openPGP payload
+  ([#497](https://github.com/chatmail/server/pull/497))
+
+- cmdeploy dns: offer alternative DKIM record format for some web interfaces
+  ([#470](https://github.com/chatmail/server/pull/470))
+
+- journald: remove old logs from disk
+  ([#490](https://github.com/chatmail/server/pull/490))
+
+- opendkim: restart once every day to mend RAM leaks
+  ([#498](https://github.com/chatmail/server/pull/498)
+
+- migration guide: let opendkim own the DKIM keys directory
+  ([#468](https://github.com/chatmail/server/pull/468))
+
+- improve secure-join message detection
+  ([#473](https://github.com/chatmail/server/pull/473))
+
+- use old crypt lib in python < 3.11
+  ([#483](https://github.com/chatmail/server/pull/483))
+
+- chatmaild: set umask to 0700 for doveauth + metadata
+  ([#490](https://github.com/chatmail/server/pull/492))
+
+- remove MTA-STS daemon
+  ([#488](https://github.com/chatmail/server/pull/488))
+
+- replace `Subject` with `[...]` for all outgoing mails.
+  ([#481](https://github.com/chatmail/server/pull/481))
+
+- opendkim: use su instead of sudo
+  ([#491](https://github.com/chatmail/server/pull/491))
+
+## 1.5.0 2024-12-20
+
+- cmdeploy dns: always show recommended DNS records
+  ([#463](https://github.com/chatmail/server/pull/463))
+
+- add `--all` to `cmdeploy dns`
+  ([#462](https://github.com/chatmail/server/pull/462))
+
+- fix `_mta-sts` TXT DNS record
+  ([#461](https://github.com/chatmail/server/pull/461)
+
+- deploy `iroh-relay` and also update "realtime relay services" in privacy policy. 
+  ([#434](https://github.com/chatmail/server/pull/434))
+  ([#451](https://github.com/chatmail/server/pull/451))
+
+- add guide to migrate chatmail to a new server
+  ([#429](https://github.com/chatmail/server/pull/429))
+
+- disable anvil authentication penalty
+  ([#414](https://github.com/chatmail/server/pull/444)
+
+- increase `request_queue_size` for UNIX sockets to 1000.
+  ([#437](https://github.com/chatmail/server/pull/437))
+
+- add argument to `cmdeploy run` for specifying
+  a different SSH host than `mail_domain`
+  ([#439](https://github.com/chatmail/server/pull/439))
+
+- query autoritative nameserver to bypass DNS cache
+  ([#424](https://github.com/chatmail/server/pull/424))
+
+- add mtail support (new optional `mtail_address` ini value)
+  This defines the address on which [`mtail`](https://google.github.io/mtail/)
+  exposes its metrics collected from the logs.
+  If you want to collect the metrics with Prometheus,
+  setup a private network (e.g. WireGuard interface)
+  and assign an IP address from this network to the host.
+  If you do not plan to collect metrics,
+  keep this setting unset.
+  ([#388](https://github.com/chatmail/server/pull/388))
+
+- fix checking for required DNS records
+  ([#412](https://github.com/chatmail/server/pull/412))
+
+- add support for specifying whole domains for recipient passthrough list
+  ([#408](https://github.com/chatmail/server/pull/408))
+
+- add a paragraph about "account deletion" to info page 
+  ([#405](https://github.com/chatmail/server/pull/405))
+
+- avoid nginx listening on ipv6 if v6 is dsiabled 
+  ([#402](https://github.com/chatmail/server/pull/402))
+
+- refactor ssh-based execution to allow organizing remote functions in
+  modules. 
+  ([#396](https://github.com/chatmail/server/pull/396))
+
+- trigger "apt upgrade" during "cmdeploy run" 
+  ([#398](https://github.com/chatmail/server/pull/398))
+
+- drop hispanilandia passthrough address
+  ([#401](https://github.com/chatmail/server/pull/401))
+
+- set CAA record flags to 0
+
+- add IMAP capabilities instead of overwriting them
+  ([#413](https://github.com/chatmail/server/pull/413))
+
+- fix OpenPGP payload check
+  ([#435](https://github.com/chatmail/server/pull/435))
+
+- fix Dovecot quota_max_mail_size to use max_message_size config value
+  ([#438](https://github.com/chatmail/server/pull/438))
+
+
 ## 1.4.1 2024-07-31
 
 - fix metadata dictproxy which would confuse transactions
   resulting in missed notifications and other issues. 
-  ([#393](https://github.com/deltachat/chatmail/pull/388))
+  ([#393](https://github.com/chatmail/server/pull/393))
-  ([#394](https://github.com/deltachat/chatmail/pull/389))
+  ([#394](https://github.com/chatmail/server/pull/394))
 
 - add optional "imap_rawlog" config option. If true, 
   .in/.out files are created in user home dirs 
   containing the imap protocol messages. 
-  ([#389](https://github.com/deltachat/chatmail/pull/389))
+  ([#389](https://github.com/chatmail/server/pull/389))
 
 ## 1.4.0 2024-07-28
 
 - Add `disable_ipv6` config option to chatmail.ini.
   Required if the server doesn't have IPv6 connectivity.
-  ([#312](https://github.com/deltachat/chatmail/pull/312))
+  ([#312](https://github.com/chatmail/server/pull/312))
 
 - allow current K9/Thunderbird-mail releases to send encrypted messages
   outside by accepting their localized "encrypted subject" strings. 
-  ([#370](https://github.com/deltachat/chatmail/pull/370))
+  ([#370](https://github.com/chatmail/server/pull/370))
 
 - Migrate and remove sqlite database in favor of password/lastlogin tracking 
   in a user's maildir.  
-  ([#379](https://github.com/deltachat/chatmail/pull/379))
+  ([#379](https://github.com/chatmail/server/pull/379))
 
 - Require pyinfra V3 installed on the client side,
   run `./scripts/initenv.sh` to upgrade locally.
-  ([#378](https://github.com/deltachat/chatmail/pull/378))
+  ([#378](https://github.com/chatmail/server/pull/378))
 
 - don't hardcode "/home/vmail" paths but rather set them 
   once in the config object and use it everywhere else, 
   thereby also improving testability.  
-  ([#351](https://github.com/deltachat/chatmail/pull/351))
+  ([#351](https://github.com/chatmail/server/pull/351))
   temporarily introduced obligatory "passdb_path" and "mailboxes_dir" 
   settings but they were removed/obsoleted in 
-  ([#380](https://github.com/deltachat/chatmail/pull/380))
+  ([#380](https://github.com/chatmail/server/pull/380))
 
 - BREAKING: new required chatmail.ini value 'delete_inactive_users_after = 100'
   which removes users from database and mails after 100 days without any login. 
-  ([#350](https://github.com/deltachat/chatmail/pull/350))
+  ([#350](https://github.com/chatmail/server/pull/350))
 
 - Refine DNS checking to distinguish between "required" and "recommended" settings 
-  ([#372](https://github.com/deltachat/chatmail/pull/372))
+  ([#372](https://github.com/chatmail/server/pull/372))
 
 - reload nginx in the acmetool cronjob
-  ([#360](https://github.com/deltachat/chatmail/pull/360))
+  ([#360](https://github.com/chatmail/server/pull/360))
 
 - remove checking of reverse-DNS PTR records.  Chatmail-servers don't
   depend on it and even in the wider e-mail system it's not common anymore. 
   If it's an issue, a chatmail operator can still care to properly set reverse DNS. 
-  ([#348](https://github.com/deltachat/chatmail/pull/348))
+  ([#348](https://github.com/chatmail/server/pull/348))
 
 - Make DNS-checking faster and more interactive, run it fully during "cmdeploy run",
   also introducing a generic mechanism for rapid remote ssh-based python function execution. 
-  ([#346](https://github.com/deltachat/chatmail/pull/346))
+  ([#346](https://github.com/chatmail/server/pull/346))
 
 - Don't fix file owner ship of /home/vmail 
-  ([#345](https://github.com/deltachat/chatmail/pull/345))
+  ([#345](https://github.com/chatmail/server/pull/345))
 
 - Support iterating over all users with doveadm commands 
-  ([#344](https://github.com/deltachat/chatmail/pull/344))
+  ([#344](https://github.com/chatmail/server/pull/344))
 
 - Test and fix for attempts to create inadmissible accounts 
-  ([#333](https://github.com/deltachat/chatmail/pull/321))
+  ([#333](https://github.com/chatmail/server/pull/321))
 
 - check that OpenPGP has only PKESK, SKESK and SEIPD packets
-  ([#323](https://github.com/deltachat/chatmail/pull/323),
+  ([#323](https://github.com/chatmail/server/pull/323),
-   [#324](https://github.com/deltachat/chatmail/pull/324))
+   [#324](https://github.com/chatmail/server/pull/324))
 
 - improve filtermail checks for encrypted messages and drop support for unencrypted MDNs
-  ([#320](https://github.com/deltachat/chatmail/pull/320))
+  ([#320](https://github.com/chatmail/server/pull/320))
 
 - replace `bash` with `/bin/sh`
-  ([#334](https://github.com/deltachat/chatmail/pull/334))
+  ([#334](https://github.com/chatmail/server/pull/334))
 
 - Increase number of logged in IMAP sessions to 50000
-  ([#335](https://github.com/deltachat/chatmail/pull/335))
+  ([#335](https://github.com/chatmail/server/pull/335))
 
 - filtermail: do not allow ASCII armor without actual payload
-  ([#325](https://github.com/deltachat/chatmail/pull/325))
+  ([#325](https://github.com/chatmail/server/pull/325))
 
 - Remove sieve to enable hardlink deduplication in LMTP
-  ([#343](https://github.com/deltachat/chatmail/pull/343))
+  ([#343](https://github.com/chatmail/server/pull/343))
 
 - dovecot: enable gzip compression on disk
-  ([#341](https://github.com/deltachat/chatmail/pull/341))
+  ([#341](https://github.com/chatmail/server/pull/341))
 
 - DKIM-sign Content-Type and oversign all signed headers
-  ([#296](https://github.com/deltachat/chatmail/pull/296))
+  ([#296](https://github.com/chatmail/server/pull/296))
 
 - Add nonci_accounts metric
-  ([#347](https://github.com/deltachat/chatmail/pull/347))
+  ([#347](https://github.com/chatmail/server/pull/347))
 
 - doveauth: log when a new account is created
-  ([#349](https://github.com/deltachat/chatmail/pull/349))
+  ([#349](https://github.com/chatmail/server/pull/349))
 
 - Multiplex HTTPS, IMAP and SMTP on port 443
-  ([#357](https://github.com/deltachat/chatmail/pull/357))
+  ([#357](https://github.com/chatmail/server/pull/357))
 
 ## 1.3.0 - 2024-06-06
 
 - don't check necessary DNS records on cmdeploy init anymore
-  ([#316](https://github.com/deltachat/chatmail/pull/316))
+  ([#316](https://github.com/chatmail/server/pull/316))
 
 - ensure cron and acl are installed
-  ([#293](https://github.com/deltachat/chatmail/pull/293),
+  ([#293](https://github.com/chatmail/server/pull/293),
-  [#310](https://github.com/deltachat/chatmail/pull/310))
+  [#310](https://github.com/chatmail/server/pull/310))
 
 - change default for delete_mails_after from 40 to 20 days
-  ([#300](https://github.com/deltachat/chatmail/pull/300))
+  ([#300](https://github.com/chatmail/server/pull/300))
 
 - save journald logs only to memory and save nginx logs to journald instead of file
-  ([#299](https://github.com/deltachat/chatmail/pull/299))
+  ([#299](https://github.com/chatmail/server/pull/299))
 
 - fix writing of multiple obs repositories in `/etc/apt/sources.list`
-  ([#290](https://github.com/deltachat/chatmail/pull/290))
+  ([#290](https://github.com/chatmail/server/pull/290))
 
 - metadata: add support for `/shared/vendor/deltachat/irohrelay`
-  ([#284](https://github.com/deltachat/chatmail/pull/284))
+  ([#284](https://github.com/chatmail/server/pull/284))
 
 - Emit "XCHATMAIL" capability from IMAP server 
-  ([#278](https://github.com/deltachat/chatmail/pull/278))
+  ([#278](https://github.com/chatmail/server/pull/278))
 
 - Move echobot `into /var/lib/echobot`
-  ([#281](https://github.com/deltachat/chatmail/pull/281))
+  ([#281](https://github.com/chatmail/server/pull/281))
 
 - Accept Let's Encrypt's new Terms of Services
-  ([#275](https://github.com/deltachat/chatmail/pull/276))
+  ([#275](https://github.com/chatmail/server/pull/276))
 
 - Reload Dovecot and Postfix when TLS certificate updates
-  ([#271](https://github.com/deltachat/chatmail/pull/271))
+  ([#271](https://github.com/chatmail/server/pull/271))
 
 - Use forked version of dovecot without hardcoded delays
-  ([#270](https://github.com/deltachat/chatmail/pull/270))
+  ([#270](https://github.com/chatmail/server/pull/270))
 
 ## 1.2.0 - 2024-04-04
 
 - Install dig on the server to resolve DNS records
-  ([#267](https://github.com/deltachat/chatmail/pull/267))
+  ([#267](https://github.com/chatmail/server/pull/267))
 
 - preserve notification order and exponentially backoff with 
   retries for tokens where we didn't get a successful return
-  ([#265](https://github.com/deltachat/chatmail/pull/263))
+  ([#265](https://github.com/chatmail/server/pull/263))
 
 - Run chatmail-metadata and doveauth as vmail
-  ([#261](https://github.com/deltachat/chatmail/pull/261))
+  ([#261](https://github.com/chatmail/server/pull/261))
 
 - Apply systemd restrictions to echobot
-  ([#259](https://github.com/deltachat/chatmail/pull/259))
+  ([#259](https://github.com/chatmail/server/pull/259))
 
 - re-enable running the CI in pull requests, but not concurrently 
-  ([#258](https://github.com/deltachat/chatmail/pull/258))
+  ([#258](https://github.com/chatmail/server/pull/258))
 
 
 ## 1.1.0 - 2024-03-28
@@ -160,27 +362,27 @@
 ### The changelog starts to record changes from March 15th, 2024 
 
 - Move systemd unit templates to cmdeploy package 
-  ([#255](https://github.com/deltachat/chatmail/pull/255))
+  ([#255](https://github.com/chatmail/server/pull/255))
 
 - Persist push tokens and support multiple device per address 
-  ([#254](https://github.com/deltachat/chatmail/pull/254))
+  ([#254](https://github.com/chatmail/server/pull/254))
 
 - Avoid warning for regular doveauth protocol's hello message. 
-  ([#250](https://github.com/deltachat/chatmail/pull/250))
+  ([#250](https://github.com/chatmail/server/pull/250))
 
 - Fix various tests to pass again with "cmdeploy test". 
-  ([#245](https://github.com/deltachat/chatmail/pull/245),
+  ([#245](https://github.com/chatmail/server/pull/245),
-  [#242](https://github.com/deltachat/chatmail/pull/242)
+  [#242](https://github.com/chatmail/server/pull/242)
 
 - Ensure lets-encrypt certificates are reloaded after renewal 
-  ([#244]) https://github.com/deltachat/chatmail/pull/244
+  ([#244]) https://github.com/chatmail/server/pull/244
 
 - Persist tokens to avoid iOS users loosing push-notifications when the
   chatmail metadata service is restarted (happens regularly during deploys)
-  ([#238](https://github.com/deltachat/chatmail/pull/239)
+  ([#238](https://github.com/chatmail/server/pull/239)
 
 - Fix failing sieve-script compile errors on incoming messages
-  ([#237](https://github.com/deltachat/chatmail/pull/239)
+  ([#237](https://github.com/chatmail/server/pull/239)
 
 - Fix quota reporting after expunging of old mails
-  ([#233](https://github.com/deltachat/chatmail/pull/239)
+  ([#233](https://github.com/chatmail/server/pull/239)

README.md

@@ -1,57 +1,105 @@
 
 <img width="800px" src="www/src/collage-top.png"/>
 
-# Chatmail services optimized for Delta Chat apps 
+# Chatmail relays for end-to-end encrypted e-mail
 
-This repository helps to setup a ready-to-use chatmail server
+Chatmail relay servers are interoperable Mail Transport Agents (MTAs) designed for: 
+
+- **Convenience:** Low friction instant onboarding
+
+- **Privacy:** No name, phone numbers, email required or collected 
+
+- **End-to-End Encryption enforced**: only OpenPGP messages with metadata minimization allowed 
+
+- **Instant:** Privacy-preserving Push Notifications for Apple, Google, and Huawei
+
+- **Speed:** Message delivery in half a second, with optional P2P realtime connections 
+
+- **Transport Security:** Strict TLS and DKIM enforced 
+
+- **Reliability:** No spam or IP reputation checks; rate-limits are suitable for realtime chats
+
+- **Efficiency:** Messages are only stored for transit and removed automatically
+
+This repository contains everything needed to setup a ready-to-use chatmail relay
 comprised of a minimal setup of the battle-tested 
-[postfix smtp](https://www.postfix.org) and [dovecot imap](https://www.dovecot.org) services. 
+[Postfix SMTP](https://www.postfix.org) and [Dovecot IMAP](https://www.dovecot.org) MTAs/MDAs.
 
-The setup is designed and optimized for providing chatmail accounts 
+The automated setup is designed and optimized for providing chatmail addresses
-for use by [Delta Chat apps](https://delta.chat).
+for immediate permission-free onboarding through chat apps and bots.
+Chatmail addresses are automatically created at first login,
+after which the initially specified password is required
+for sending and receiving messages through them.
 
-Chatmail accounts are automatically created by a first login, 
+Please see [this list of known apps and client projects](https://chatmail.at/clients.html) 
-after which the initially specified password is required for using them. 
+and [this list of known public 3rd party chatmail relay servers](https://chatmail.at/relays).
 
-## Deploying your own chatmail server 
 
-To deploy chatmail on your own server, you must have set-up ssh authentication and need to use an ed25519 key, due to an [upstream bug in paramiko](https://github.com/paramiko/paramiko/issues/2191). You also need to add your private key to the local ssh-agent, because you can't type in your password during deployment.
+## Minimal requirements, Prerequisites 
 
-We use `chat.example.org` as the chatmail domain in the following steps. 
+You will need the following: 
+
+- Control over a domain through a DNS provider of your choice.
+
+- A Debian 12 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 chatmail addresses.
+
+- Key-based SSH authentication to the root user.
+  You must add a passphrase-protected private key to your local ssh-agent
+  because you can't type in your passphrase during deployment.
+  (An ed25519 private key is required due to an [upstream bug in paramiko](https://github.com/paramiko/paramiko/issues/2191))
+
+
+## Getting started 
+
+We use `chat.example.org` as the chatmail domain in the following steps.
 Please substitute it with your own domain. 
 
-1. Install the `cmdeploy` command in a virtualenv
+1. 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.
 
    ```
-    git clone https://github.com/deltachat/chatmail
+    chat.example.com. 3600 IN A 198.51.100.5
-    cd chatmail
+    chat.example.com. 3600 IN AAAA 2001:db8::5
+    www.chat.example.com. 3600 IN CNAME chat.example.com.
+    mta-sts.chat.example.com. 3600 IN CNAME chat.example.com.
+   ```
+
+2. On your local PC, clone the repository and bootstrap the Python virtualenv.
+
+   ```
+    git clone https://github.com/chatmail/relay
+    cd relay
     scripts/initenv.sh
    ```
 
-2. Create chatmail configuration file `chatmail.ini`:
+3. On your local PC, create chatmail configuration file `chatmail.ini`:
 
    ```
     scripts/cmdeploy init chat.example.org  # <-- use your domain 
    ```
 
-3. Setup first DNS records for your chatmail domain, 
+4. Verify that SSH root login to your remote server works:
-   according to the hints provided by `cmdeploy init`.
-   Verify that SSH root login works:
 
    ```
-    ssh root@chat.example.org   # <-- use your domain 
+    ssh root@chat.example.org  # <-- use your domain 
    ```
 
-4. Deploy to the remote chatmail server:
+5. From your local PC, deploy the remote chatmail relay server:
 
    ```
     scripts/cmdeploy run
    ```
-   This script will also show you additional DNS records
+   This script will also check that you have all necessary DNS records.
+   If DNS records are missing, it will recommend
    which you should configure at your DNS provider
    (it can take some time until they are public).
 
-### Other helpful commands:
+### Other helpful commands
 
 To check the status of your remotely running chatmail service:
 
@@ -59,7 +107,7 @@ To check the status of your remotely running chatmail service:
 scripts/cmdeploy status
 ```
 
-To check whether your DNS records are correct:
+To display and check all recommended DNS records:
 
 ```
 scripts/cmdeploy dns
@@ -79,43 +127,113 @@ scripts/cmdeploy bench
 
 ## Overview of this repository
 
-This repository drives the development of chatmail services, 
+This repository has four directories:
-comprised of minimal setups of
 
-- [postfix smtp server](https://www.postfix.org)
+- [cmdeploy](https://github.com/chatmail/relay/tree/main/cmdeploy)
-- [dovecot imap server](https://www.dovecot.org)
+  is a collection of configuration files
+  and a [pyinfra](https://pyinfra.com)-based deployment script.
 
-as well as custom services that are integrated with these two:
+- [chatmaild](https://github.com/chatmail/relay/tree/main/chatmaild)
+  is a Python package containing several small services
+  which handle authentication,
+  trigger push notifications on new messages,
+  ensure that outbound mails are encrypted,
+  delete inactive users,
+  and some other minor things.
+  chatmaild can also be installed as a stand-alone Python package.
 
-- `chatmaild/src/chatmaild/doveauth.py` implements
+- [www](https://github.com/chatmail/relay/tree/main/www)
-  create-on-login account creation semantics and is used
+  contains the html, css, and markdown files
-  by Dovecot during login authentication and by Postfix
+  which make up a chatmail relay's web page.
+  Edit them before deploying to make your chatmail relay stand out.
+
+- [scripts](https://github.com/chatmail/relay/tree/main/scripts)
+  offers two convenience tools for beginners;
+  `initenv.sh` installs the necessary dependencies to a local virtual environment,
+  and the `scripts/cmdeploy` script enables you
+  to run the `cmdeploy` command line tool in the local virtual environment.
+
+### cmdeploy
+
+The `cmdeploy/src/cmdeploy/cmdeploy.py` command line tool
+helps with setting up and managing the chatmail service.
+`cmdeploy init` creates the `chatmail.ini` config file.
+`cmdeploy run` uses a [pyinfra](https://pyinfra.com/)-based [`script`](cmdeploy/src/cmdeploy/__init__.py)
+to automatically install or upgrade all chatmail components on a relay,
+according to the `chatmail.ini` config.
+
+The components of chatmail are:
+
+- [Postfix SMTP MTA](https://www.postfix.org) accepts and relays messages
+  (both from your users and from the wider e-mail MTA network)
+
+- [Dovecot IMAP MDA](https://www.dovecot.org) stores messages for your users until they download them
+
+- [Nginx](https://nginx.org/) shows the web page with your privacy policy and additional information
+
+- [acmetool](https://hlandau.github.io/acmetool/) manages TLS certificates for Dovecot, Postfix, and Nginx
+
+- [OpenDKIM](http://www.opendkim.org/) for signing messages with DKIM and rejecting inbound messages without DKIM
+
+- [mtail](https://google.github.io/mtail/) for collecting anonymized metrics in case you have monitoring
+
+- [Iroh relay](https://www.iroh.computer/docs/concepts/relay) 
+  which helps client devices to establish Peer-to-Peer connections 
+
+- and the chatmaild services, explained in the next section:
+
+### chatmaild
+
+`chatmaild` implements various systemd-controlled services  
+that integrate with Dovecot and Postfix to achieve instant-onboarding and 
+only relaying OpenPGP end-to-end messages encrypted messages. 
+A short overview of `chatmaild` services: 
+
+- [`doveauth`](https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/doveauth.py) 
+  implements create-on-login address semantics and is used 
+  by Dovecot during IMAP login and by Postfix during SMTP/SUBMISSION login
   which in turn uses [Dovecot SASL](https://doc.dovecot.org/configuration_manual/authentication/dict/#complete-example-for-authenticating-via-a-unix-socket)
-  to authenticate users
+  to authenticate logins. 
-  to send mails for them.
 
-- `chatmaild/src/chatmaild/filtermail.py` prevents
+- [`filtermail`](https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/filtermail.py) 
-  unencrypted e-mail from leaving the chatmail service
+  prevents unencrypted email from leaving or entering the chatmail service
-  and is integrated into postfix's outbound mail pipelines.
+  and is integrated into Postfix's outbound and inbound mail pipelines.
 
-There is also the `cmdeploy/src/cmdeploy/cmdeploy.py` command line tool
+- [`chatmail-metadata`](https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/metadata.py) is contacted by a
-which helps with setting up and managing the chatmail service.
+  [Dovecot lua script](https://github.com/chatmail/relay/blob/main/cmdeploy/src/cmdeploy/dovecot/push_notification.lua)
-`cmdeploy run` uses [pyinfra-based scripting](https://pyinfra.com/)
+  to store user-specific relay-side config.
-in `cmdeploy/src/cmdeploy/__init__.py`
+  On new messages,
-to automatically install all chatmail components on a server.
+  it [passes the user's push notification token](https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/notifier.py)
+  to [notifications.delta.chat](https://delta.chat/help#instant-delivery)
+  so the push notifications on the user's phone can be triggered
+  by Apple/Google/Huawei.
 
+- [`delete_inactive_users`](https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/delete_inactive_users.py)
+  deletes users if they have not logged in for a very long time.
+  The timeframe can be configured in `chatmail.ini`.
+
+- [`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.
+
+- [`echobot`](https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/echo.py)
+  is a small bot for test purposes.
+  It simply echoes back messages from users.
+
+- [`chatmail-metrics`](https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/metrics.py)
+  collects some metrics and displays them at `https://example.org/metrics`.
 
 ### Home page and getting started for users
 
-`cmdeploy run` also creates default static Web pages and deploys them
+`cmdeploy run` also creates default static web pages and deploys them
-to a nginx web server with: 
+to a Nginx web server with:
 
 - a default `index.html` along with a QR code that users can click to
-  create accounts on your chatmail provider,
+  create an address on your chatmail relay 
 
-- a default `info.html` that is linked from the home page,
+- a default `info.html` that is linked from the home page
 
-- a default `policy.html` that is linked from the home page.
+- a default `policy.html` that is linked from the home page
 
 All `.html` files are generated
 by the according markdown `.md` file in the `www/src` directory.
@@ -123,48 +241,64 @@ by the according markdown `.md` file in the `www/src` directory.
 
 ### Refining the web pages
 
-
 ```
 scripts/cmdeploy webdev
 ```
 
-This starts a local live development cycle for chatmail Web pages:
+This starts a local live development cycle for chatmail web pages:
 
 - uses the `www/src/page-layout.html` file for producing static
   HTML pages from `www/src/*.md` files
 
 - continously builds the web presence reading files from `www/src` directory
-  and generating html files and copying assets to the `www/build` directory.
+  and generating HTML files and copying assets to the `www/build` directory.
 
 - Starts a browser window automatically where you can "refresh" as needed.
 
+## Mailbox directory layout
 
-## Emergency Commands to disable automatic account creation
+Fresh chatmail addresses have a mailbox directory that contains: 
 
-If you need to stop account creation,
+- a `password` file with the salted password required for authenticating
-e.g. because some script is wildly creating accounts,
+  whether a login may use the address to send/receive messages. 
-login to the server with ssh and run:
+  If you modify the password file manually, you effectively block the user. 
+
+- `enforceE2EEincoming` is a default-created file with each address. 
+  If present the file indicates that this chatmail address rejects incoming cleartext messages.
+  If absent the address accepts incoming cleartext messages. 
+
+- `dovecot*`, `cur`, `new` and `tmp` represent IMAP/mailbox state. 
+  If the address is only used by one device, the Maildir directories
+  will typically be empty unless the user of that address hasn't been online 
+  for a while. 
+
+
+## Emergency Commands to disable automatic address creation
+
+If you need to stop address creation,
+e.g. because some script is wildly creating addresses, 
+login with ssh and run:
 
 ```
     touch /etc/chatmail-nocreate
 ```
 
-While this file is present, account creation will be blocked.
+Chatmail address creation will be denied while this file is present.
 
 ### Ports
 
-[Postfix](http://www.postfix.org/) listens on ports 25 (smtp) and 587 (submission) and 465 (submissions).
+[Postfix](http://www.postfix.org/) listens on ports 25 (SMTP) and 587 (SUBMISSION) and 465 (SUBMISSIONS).
-[Dovecot](https://www.dovecot.org/) listens on ports 143 (imap) and 993 (imaps).
+[Dovecot](https://www.dovecot.org/) listens on ports 143 (IMAP) and 993 (IMAPS).
-[nginx](https://www.nginx.com/) listens on port 8443 (https-alt) and 443 (https).
+[Nginx](https://www.nginx.com/) listens on port 8443 (HTTPS-ALT) and 443 (HTTPS).
 Port 443 multiplexes HTTPS, IMAP and SMTP using ALPN to redirect connections to ports 8443, 465 or 993.
-[acmetool](https://hlandau.github.io/acmetool/) listens on port 80 (http).
+[acmetool](https://hlandau.github.io/acmetool/) listens on port 80 (HTTP).
 
-Delta Chat apps will, however, discover all ports and configurations
+chatmail-core based apps will, however, discover all ports and configurations
-automatically by reading the [autoconfig XML file](https://www.ietf.org/archive/id/draft-bucksch-autoconfig-00.html) from the chatmail service.
+automatically by reading the [autoconfig XML file](https://www.ietf.org/archive/id/draft-bucksch-autoconfig-00.html) from the chatmail relay server.
 
 ## Email authentication
 
-chatmail servers rely on [DKIM](https://www.rfc-editor.org/rfc/rfc6376)
+Chatmail relays enforce [DKIM](https://www.rfc-editor.org/rfc/rfc6376)
 to authenticate incoming emails.
 Incoming emails must have a valid DKIM signature with
 Signing Domain Identifier (SDID, `d=` parameter in the DKIM-Signature header)
@@ -186,3 +320,227 @@ to MAIL FROM with
 and rejects incorrectly authenticated emails with [`reject_sender_login_mismatch`](reject_sender_login_mismatch) policy.
 `From:` header must correspond to envelope MAIL FROM,
 this is 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`.
+If emails don't arrive at your chatmail relay server, 
+the problem is likely that your relay does not have a valid TLS certificate.
+
+You can test it by resolving `MX` records of your relay domain
+and then connecting to MX relays (e.g `mx.example.org`) with
+`openssl s_client -connect mx.example.org:25 -verify_hostname mx.example.org -verify_return_error -starttls smtp`
+from the host that has open port 25 to verify that certificate is valid.
+
+When providing a TLS certificate to your chatmail relay server, 
+make sure to provide the full certificate chain
+and not just the last certificate.
+
+If you are running an Exim server and don't see incoming connections
+from a chatmail relay server in the logs,
+make sure `smtp_no_mail` log item is enabled in the config
+with `log_selector = +smtp_no_mail`.
+By default Exim does not log sessions that are closed
+before sending the `MAIL` command.
+This happens if certificate is not recognized as valid by Postfix,
+so you might think that connection is not established
+while actually it is a problem with your TLS certificate.
+
+## Migrating a chatmail relay to a new host
+
+If you want to migrate chatmail relay from an old machine
+to a new machine,
+you can use these steps.
+They were tested with a Linux laptop;
+you might need to adjust some of the steps to your environment.
+
+Let's assume that your `mail_domain` is `mail.example.org`,
+all involved machines run Debian 12,
+your old site's IP address is `13.37.13.37`,
+and your new site's IP address is `13.12.23.42`.
+
+Note, you should lower the TTLs of your DNS records to a value
+such as 300 (5 minutes) so the migration happens as smoothly as possible.
+
+During the guide you might get a warning about changed SSH Host keys;
+in this case, just run `ssh-keygen -R "mail.example.org"` as recommended.
+
+1. First, disable mail services on the old site. 
+
+   ```
+    cmdeploy run --disable-mail --ssh-host 13.37.13.37
+   ```
+
+   Now your users will notice the migration
+   and will not be able to send or receive messages
+   until the migration is completed.
+
+2. Now we want to copy `/home/vmail`, `/var/lib/acme`, `/etc/dkimkeys`, `/run/echobot`, and `/var/spool/postfix` to the new site. 
+   Login to the old site while forwarding your SSH agent 
+   so you can copy directly from the old to the new site with your SSH key:
+   ```
+    ssh -A root@13.37.13.37
+    tar c - /home/vmail/mail /var/lib/acme /etc/dkimkeys /run/echobot /var/spool/postfix | ssh root@13.12.23.42 "tar x -C /"
+   ```
+
+   This transfers all addresses, the TLS certificate, DKIM keys (so DKIM DNS record remains valid), and the echobot's password so it continues to function.
+   It also preserves the Postfix mail spool so any messages pending delivery will still be delivered.
+
+3. Install chatmail on the new machine:
+
+   ```
+    cmdeploy run --disable-mail --ssh-host 13.12.23.42
+   ```
+   Postfix and Dovecot are disabled for now; we will enable them later. 
+   We first need to make the new site fully operational. 
+
+3. On the new site, run the following to ensure the ownership is correct in case UIDs/GIDs changed:
+
+   ```
+    chown root: -R /var/lib/acme
+    chown opendkim: -R /etc/dkimkeys
+    chown vmail: -R /home/vmail/mail
+    chown echobot: -R /run/echobot
+   ```
+
+4. Now, update DNS entries. 
+
+   If other MTAs try to deliver messages to your chatmail domain they may fail intermittently,
+   as DNS catches up with the new site settings 
+   but normally will retry delivering messages
+   for at least a week, so messages will not be lost.
+
+5. Finally, you can execute `cmdeploy run --ssh-host 13.12.23.42` to turn on chatmail on the new relay.
+   Your users will be able to use the chatmail relay as soon as the DNS changes have propagated.
+   Voilà!
+
+## Setting up a reverse proxy
+
+A chatmail relay MTA does not track or depend on the client IP address
+for its operation, so it can be run behind a reverse proxy.
+This will not even affect incoming mail authentication
+as DKIM only checks the cryptographic signature
+of the message and does not use the IP address as the input.
+
+For example, you may want to self-host your chatmail relay
+and only use hosted VPS to provide a public IP address
+for client connections and incoming mail.
+You can connect chatmail relay to VPS
+using a tunnel protocol
+such as [WireGuard](https://www.wireguard.com/)
+and setup a reverse proxy on a VPS
+to forward connections to the chatmail relay
+over the tunnel.
+You can also setup multiple reverse proxies
+for your chatmail relay in different networks
+to ensure your relay is reachable even when
+one of the IPs becomes inaccessible due to
+hosting or routing problems.
+
+Note that your chatmail relay still needs
+to be able to make outgoing connections on port 25
+to send messages outside.
+
+To setup a reverse proxy
+(or rather Destination NAT, DNAT)
+for your chatmail relay,
+put the following configuration in `/etc/nftables.conf`:
+```
+#!/usr/sbin/nft -f
+
+flush ruleset
+
+define wan = eth0
+
+# Which ports to proxy.
+#
+# Note that SSH is not proxied
+# so it is possible to log into the proxy server 
+# and not the original one.
+define ports = { smtp, http, https, imap, imaps, submission, submissions }
+
+# The host we want to proxy to.
+define ipv4_address = AAA.BBB.CCC.DDD
+define ipv6_address = [XXX::1]
+
+table ip nat {
+        chain prerouting {
+                type nat hook prerouting priority dstnat; policy accept;
+                iif $wan tcp dport $ports dnat to $ipv4_address
+        }
+
+        chain postrouting {
+                type nat hook postrouting priority 0;
+
+                oifname $wan masquerade
+        }
+}
+
+table ip6 nat {
+        chain prerouting {
+                type nat hook prerouting priority dstnat; policy accept;
+                iif $wan tcp dport $ports dnat to $ipv6_address
+        }
+
+        chain postrouting {
+                type nat hook postrouting priority 0;
+
+                oifname $wan masquerade
+        }
+}
+
+table inet filter {
+        chain input {
+                type filter hook input priority filter; policy drop;
+
+                # Accept ICMP.
+                # It is especially important to accept ICMPv6 ND messages,
+                # otherwise IPv6 connectivity breaks.
+                icmp type { echo-request } accept
+                icmpv6 type { echo-request, nd-neighbor-solicit, nd-router-advert, nd-neighbor-advert } accept
+
+                # Allow incoming SSH connections.
+                tcp dport { ssh } accept
+
+                ct state established accept
+        }
+        chain forward {
+                type filter hook forward priority filter; policy drop;
+
+                ct state established accept
+                ip daddr $ipv4_address counter accept
+                ip6 daddr $ipv6_address counter accept
+        }
+        chain output {
+                type filter hook output priority filter;
+        }
+}
+```
+
+Run `systemctl enable nftables.service`
+to ensure configuration is reloaded when the proxy relay reboots.
+
+Uncomment in `/etc/sysctl.conf` the following two lines:
+
+```
+net.ipv4.ip_forward=1
+net.ipv6.conf.all.forwarding=1
+```
+
+Then reboot the relay or do `sysctl -p` and `nft -f /etc/nftables.conf`.
+
+Once proxy relay is set up,
+you can add its IP address to the DNS.
+
+## Neighbors and Acquaintances
+
+Here are some related projects that you may be interested in:
+
+- [Mox](https://github.com/mjl-/mox): A Golang email server.  [Work is in
+  progress](https://github.com/mjl-/mox/issues/251) to modify it to support all
+  of the features and configuration settings required to operate as a chatmail
+  relay.
+- [Maddy-Chatmail](https://github.com/sadraiiali/maddy_chatmail): a plugin for the
+  [Maddy email server](https://maddy.email/) which aims to implement the
+  chatmail relay features and configuration options.

chatmaild/pyproject.toml

@@ -12,6 +12,7 @@ dependencies = [
   "deltachat-rpc-client",
   "filelock",
   "requests",
+  "crypt-r >= 3.13.1 ; python_version >= '3.11'",
 ]
 
 [tool.setuptools]
@@ -47,6 +48,9 @@ lint.select = [
   "PLE", # Pylint Error
   "PLW", # Pylint Warning
 ]
+lint.ignore = [
+  "PLC0415" # import-outside-top-level
+]
 
 [tool.tox]
 legacy_tox_ini = """

chatmaild/src/chatmaild/__init__.py

@@ -0,0 +1 @@
+

chatmaild/src/chatmaild/common_encrypted_subjects.py

@@ -1,59 +0,0 @@
-"""Generated from deltachat, draft-ietf-lamps-header-protection, and
-encrypted_subject localizations in
-https://github.com/thunderbird/thunderbird-android/
-
-"""
-
-common_encrypted_subjects = {
-    "...",
-    "[...]",
-    "암호화된 메시지",
-    "Ĉifrita mesaĝo",
-    "Courriel chiffré",
-    "Dulrituð skilaboð",
-    "Encrypted Message",
-    "Fersifere berjocht",
-    "Kemennadenn enrineget",
-    "Krüptitud kiri",
-    "Krypterat meddelande",
-    "Krypteret besked",
-    "Kryptert melding",
-    "Mensagem criptografada",
-    "Mensagem encriptada",
-    "Mensaje cifrado",
-    "Mensaxe cifrada",
-    "Mesaj Criptat",
-    "Mesazh i Fshehtëzuar",
-    "Messaggio criptato",
-    "Messaghju cifratu",
-    "Missatge encriptat",
-    "Neges wedi'i Hamgryptio",
-    "Pesan terenkripsi",
-    "Salattu viesti",
-    "Şifreli İleti",
-    "Šifrēta ziņa",
-    "Šifrirana poruka",
-    "Šifrirano sporočilo",
-    "Šifruotas laiškas",
-    "Tin nhắn được mã hóa",
-    "Titkosított üzenet",
-    "Verschlüsselte Nachricht",
-    "Versleuteld bericht",
-    "Zašifrovaná zpráva",
-    "Zaszyfrowana wiadomość",
-    "Zifratu mezua",
-    "Κρυπτογραφημένο μήνυμα",
-    "Зашифроване повідомлення",
-    "Зашифрованное сообщение",
-    "Зашыфраваны ліст",
-    "Криптирано съобщение",
-    "Шифрована порука",
-    "დაშიფრული წერილი",
-    "הודעה מוצפנת",
-    "پیام رمزنگاری‌شده",
-    "رسالة مشفّرة",
-    "എൻക്രിപ്റ്റുചെയ്‌ത സന്ദേശം",
-    "加密邮件",
-    "已加密的訊息",
-    "暗号化されたメッセージ",
-}

chatmaild/src/chatmaild/config.py

@@ -11,7 +11,11 @@ def read_config(inipath):
     assert Path(inipath).exists(), inipath
     cfg = iniconfig.IniConfig(inipath)
     params = cfg.sections["params"]
-    return Config(inipath, params=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)
 
 
 class Config:
@@ -22,6 +26,7 @@ class Config:
         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"])
@@ -29,10 +34,22 @@ class Config:
         self.passthrough_senders = params["passthrough_senders"].split()
         self.passthrough_recipients = params["passthrough_recipients"].split()
         self.filtermail_smtp_port = int(params["filtermail_smtp_port"])
+        self.filtermail_smtp_port_incoming = int(
+            params["filtermail_smtp_port_incoming"]
+        )
         self.postfix_reinject_port = int(params["postfix_reinject_port"])
+        self.postfix_reinject_port_incoming = int(
+            params["postfix_reinject_port_incoming"]
+        )
+        self.mtail_address = params.get("mtail_address")
         self.disable_ipv6 = params.get("disable_ipv6", "false").lower() == "true"
         self.imap_rawlog = params.get("imap_rawlog", "false").lower() == "true"
-        self.iroh_relay = params.get("iroh_relay")
+        if "iroh_relay" not in params:
+            self.iroh_relay = "https://" + params["mail_domain"]
+            self.enable_iroh_relay = True
+        else:
+            self.iroh_relay = params["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")
@@ -48,7 +65,7 @@ class Config:
     def _getbytefile(self):
         return open(self._inipath, "rb")
 
-    def get_user(self, addr):
+    def get_user(self, addr) -> User:
         if not addr or "@" not in addr or "/" in addr:
             raise ValueError(f"invalid address {addr!r}")
 
@@ -63,6 +80,11 @@ class Config:
 
 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)
+    inipath.write_text(content)
+
+
+def get_default_config_content(mail_domain, **overrides):
     from importlib.resources import files
 
     inidir = files(__package__).joinpath("ini")
@@ -94,7 +116,7 @@ def write_initial_config(inipath, mail_domain, overrides):
         lines = []
         for line in content.split("\n"):
             for key, value in privacy.items():
-                value_lines = value.strip().split("\n")
+                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:
@@ -107,5 +129,4 @@ def write_initial_config(inipath, mail_domain, overrides):
             else:
                 lines.append(line)
         content = "\n".join(lines)
-
+    return content
-    inipath.write_text(content)

chatmaild/src/chatmaild/dictproxy.py

@@ -87,8 +87,12 @@ class DictProxy:
         except FileNotFoundError:
             pass
 
-        with ThreadingUnixStreamServer(socket, Handler) as server:
+        with CustomThreadingUnixStreamServer(socket, Handler) as server:
             try:
                 server.serve_forever()
             except KeyboardInterrupt:
                 pass
+
+
+class CustomThreadingUnixStreamServer(ThreadingUnixStreamServer):
+    request_queue_size = 1000

chatmaild/src/chatmaild/doveauth.py

@@ -1,9 +1,13 @@
-import crypt
 import json
 import logging
 import os
 import sys
 
+try:
+    import crypt_r
+except ImportError:
+    import crypt as crypt_r
+
 from .config import Config, read_config
 from .dictproxy import DictProxy
 from .migrate_db import migrate_from_db_to_maildir
@@ -13,7 +17,7 @@ NOCREATE_FILE = "/etc/chatmail-nocreate"
 
 def encrypt_password(password: str):
     # https://doc.dovecot.org/configuration_manual/authentication/password_schemes/
-    passhash = crypt.crypt(password, crypt.METHOD_SHA512)
+    passhash = crypt_r.crypt(password, crypt_r.METHOD_SHA512)
     return "{SHA512-CRYPT}" + passhash
 
 

chatmaild/src/chatmaild/echo.py

@@ -8,6 +8,7 @@ import logging
 import os
 import subprocess
 import sys
+from pathlib import Path
 
 from deltachat_rpc_client import Bot, DeltaChat, EventType, Rpc, events
 
@@ -97,6 +98,10 @@ def main():
         if not bot.is_configured():
             bot.configure(addr, password)
 
+        # write invite link to working directory
+        invitelink = bot.account.get_qr_code()
+        Path("invite-link.txt").write_text(invitelink)
+
         bot.run_forever()
 
 

chatmaild/src/chatmaild/filtermail.py

@@ -11,10 +11,12 @@ from email.utils import parseaddr
 from smtplib import SMTP as SMTPClient
 
 from aiosmtpd.controller import Controller
+from aiosmtpd.smtp import SMTP
 
-from .common_encrypted_subjects import common_encrypted_subjects
 from .config import read_config
 
+ENCRYPTION_NEEDED_523 = "523 Encryption Needed: Invalid Unencrypted Mail"
+
 
 def check_openpgp_payload(payload: bytes):
     """Checks the OpenPGP payload.
@@ -36,6 +38,12 @@ def check_openpgp_payload(payload: bytes):
 
         packet_type_id = payload[i] & 0x3F
         i += 1
+
+        while payload[i] >= 224 and payload[i] < 255:
+            # Partial body length.
+            partial_length = 1 << (payload[i] & 0x1F)
+            i += 1 + partial_length
+
         if payload[i] < 192:
             # One-octet length.
             body_len = payload[i]
@@ -54,16 +62,17 @@ def check_openpgp_payload(payload: bytes):
             )
             i += 5
         else:
-            # Partial body length is not allowed.
+            # Impossible, partial body length was processed above.
             return False
 
         i += body_len
 
         if i == len(payload):
-            if packet_type_id == 18:
+            # Last packet should be
-                # Last packet should be
+            # Symmetrically Encrypted and Integrity Protected Data Packet (SEIPD)
-                # Symmetrically Encrypted and Integrity Protected Data Packet (SEIPD)
+            #
-                return True
+            # This is the only place where this function may return `True`.
+            return packet_type_id == 18
         elif packet_type_id not in [1, 3]:
             # All packets except the last one must be either
             # Public-Key Encrypted Session Key Packet (PKESK)
@@ -71,13 +80,7 @@ def check_openpgp_payload(payload: bytes):
             # Symmetric-Key Encrypted Session Key Packet (SKESK)
             return False
 
-    if i == 0:
+    return False
-        return False
-
-    if i > len(payload):
-        # Payload is truncated.
-        return False
-    return True
 
 
 def check_armored_payload(payload: str):
@@ -86,7 +89,9 @@ def check_armored_payload(payload: str):
         return False
     payload = payload.removeprefix(prefix)
 
-    suffix = "-----END PGP MESSAGE-----\r\n\r\n"
+    while payload.endswith("\r\n"):
+        payload = payload.removesuffix("\r\n")
+    suffix = "-----END PGP MESSAGE-----"
     if not payload.endswith(suffix):
         return False
     payload = payload.removesuffix(suffix)
@@ -105,6 +110,27 @@ def check_armored_payload(payload: str):
         return False
 
 
+def is_securejoin(message):
+    if message.get("secure-join") not in ["vc-request", "vg-request"]:
+        return False
+    if not message.is_multipart():
+        return False
+    parts_count = 0
+    for part in message.iter_parts():
+        parts_count += 1
+        if parts_count > 1:
+            return False
+        if part.is_multipart():
+            return False
+        if part.get_content_type() != "text/plain":
+            return False
+
+        payload = part.get_payload().strip().lower()
+        if payload not in ("secure-join: vc-request", "secure-join: vg-request"):
+            return False
+    return True
+
+
 def check_encrypted(message):
     """Check that the message is an OpenPGP-encrypted message.
 
@@ -112,8 +138,6 @@ def check_encrypted(message):
     """
     if not message.is_multipart():
         return False
-    if message.get("subject") not in common_encrypted_subjects:
-        return False
     if message.get_content_type() != "multipart/encrypted":
         return False
     parts_count = 0
@@ -142,12 +166,45 @@ def check_encrypted(message):
     return True
 
 
-async def asyncmain_beforequeue(config):
+async def asyncmain_beforequeue(config, mode):
-    port = config.filtermail_smtp_port
+    if mode == "outgoing":
-    Controller(BeforeQueueHandler(config), hostname="127.0.0.1", port=port).start()
+        port = config.filtermail_smtp_port
+        handler = OutgoingBeforeQueueHandler(config)
+    else:
+        port = config.filtermail_smtp_port_incoming
+        handler = IncomingBeforeQueueHandler(config)
+    HackedController(
+        handler,
+        hostname="127.0.0.1",
+        port=port,
+        data_size_limit=config.max_message_size,
+    ).start()
 
 
-class BeforeQueueHandler:
+def recipient_matches_passthrough(recipient, passthrough_recipients):
+    for addr in passthrough_recipients:
+        if recipient == addr:
+            return True
+        if addr[0] == "@" and recipient.endswith(addr):
+            return True
+    return False
+
+
+class HackedController(Controller):
+    def factory(self):
+        return SMTPDiscardRCPTO_options(self.handler, **self.SMTP_kwargs)
+
+
+class SMTPDiscardRCPTO_options(SMTP):
+    def _getparams(self, params):
+        # aiosmtpd's SMTP daemon fails to handle a request if there are RCPT TO options
+        # We just ignore them for our incoming filtermail purposes
+        if len(params) == 1 and params[0].startswith("ORCPT"):
+            return {}
+        return super()._getparams(params)
+
+
+class OutgoingBeforeQueueHandler:
     def __init__(self, config):
         self.config = config
         self.send_rate_limiter = SendRateLimiter()
@@ -172,7 +229,9 @@ class BeforeQueueHandler:
             return error
         logging.info("re-injecting the mail that passed checks")
         client = SMTPClient("localhost", self.config.postfix_reinject_port)
-        client.sendmail(envelope.mail_from, envelope.rcpt_tos, envelope.content)
+        client.sendmail(
+            envelope.mail_from, envelope.rcpt_tos, envelope.original_content
+        )
         return "250 OK"
 
     def check_DATA(self, envelope):
@@ -183,34 +242,86 @@ class BeforeQueueHandler:
         mail_encrypted = check_encrypted(message)
 
         _, from_addr = parseaddr(message.get("from").strip())
-        logging.info(f"mime-from: {from_addr} envelope-from: {envelope.mail_from!r}")
+
         if envelope.mail_from.lower() != from_addr.lower():
             return f"500 Invalid FROM <{from_addr!r}> for <{envelope.mail_from!r}>"
 
+        if mail_encrypted or is_securejoin(message):
+            print("Outgoing: Filtering encrypted mail.", file=sys.stderr)
+            return
+
+        print("Outgoing: Filtering unencrypted mail.", file=sys.stderr)
+
         if envelope.mail_from in self.config.passthrough_senders:
             return
 
-        passthrough_recipients = self.config.passthrough_recipients
+        # allow self-sent Autocrypt Setup Message
-        envelope_from_domain = from_addr.split("@").pop()
+        if envelope.rcpt_tos == [from_addr]:
-        for recipient in envelope.rcpt_tos:
+            if message.get("subject") == "Autocrypt Setup Message":
-            if envelope.mail_from == recipient:
+                if message.get_content_type() == "multipart/mixed":
-                # Always allow sending emails to self.
+                    return
-                continue
-            if recipient in passthrough_recipients:
-                continue
-            res = recipient.split("@")
-            if len(res) != 2:
-                return f"500 Invalid address <{recipient}>"
-            _recipient_addr, recipient_domain = res
 
-            is_outgoing = recipient_domain != envelope_from_domain
+        passthrough_recipients = self.config.passthrough_recipients
-            if is_outgoing and not mail_encrypted:
+
-                is_securejoin = message.get("secure-join") in [
+        for recipient in envelope.rcpt_tos:
-                    "vc-request",
+            if recipient_matches_passthrough(recipient, passthrough_recipients):
-                    "vg-request",
+                continue
-                ]
+
-                if not is_securejoin:
+            print("Rejected unencrypted mail.", file=sys.stderr)
-                    return f"500 Invalid unencrypted mail to <{recipient}>"
+            return ENCRYPTION_NEEDED_523
+
+
+class IncomingBeforeQueueHandler:
+    def __init__(self, config):
+        self.config = config
+
+    async def handle_DATA(self, server, session, envelope):
+        logging.info("handle_DATA before-queue")
+        error = self.check_DATA(envelope)
+        if error:
+            return error
+        logging.info("re-injecting the mail that passed checks")
+
+        # the smtp daemon on reinject_port_incoming gives it to dkim milter
+        # which looks at source address to determine whether to verify or sign
+        client = SMTPClient(
+            "localhost",
+            self.config.postfix_reinject_port_incoming,
+            source_address=("127.0.0.2", 0),
+        )
+        client.sendmail(
+            envelope.mail_from, envelope.rcpt_tos, envelope.original_content
+        )
+        return "250 OK"
+
+    def check_DATA(self, envelope):
+        """the central filtering function for e-mails."""
+        logging.info(f"Processing DATA message from {envelope.mail_from}")
+
+        message = BytesParser(policy=policy.default).parsebytes(envelope.content)
+        mail_encrypted = check_encrypted(message)
+
+        if mail_encrypted or is_securejoin(message):
+            print("Incoming: Filtering encrypted mail.", file=sys.stderr)
+            return
+
+        print("Incoming: Filtering unencrypted mail.", file=sys.stderr)
+
+        # we want cleartext mailer-daemon messages to pass through
+        # chatmail core will typically not display them as normal messages
+        if message.get("auto-submitted"):
+            _, from_addr = parseaddr(message.get("from").strip())
+            if from_addr.lower().startswith("mailer-daemon@"):
+                if message.get_content_type() == "multipart/report":
+                    return
+
+        for recipient in envelope.rcpt_tos:
+            user = self.config.get_user(recipient)
+            if user is None or user.is_incoming_cleartext_ok():
+                continue
+
+            print("Rejected unencrypted mail.", file=sys.stderr)
+            return ENCRYPTION_NEEDED_523
 
 
 class SendRateLimiter:
@@ -229,11 +340,14 @@ class SendRateLimiter:
 
 def main():
     args = sys.argv[1:]
-    assert len(args) == 1
+    assert len(args) == 2
     config = read_config(args[0])
+    mode = args[1]
     logging.basicConfig(level=logging.WARN)
     loop = asyncio.new_event_loop()
     asyncio.set_event_loop(loop)
-    task = asyncmain_beforequeue(config)
+    assert mode in ["incoming", "outgoing"]
+    task = asyncmain_beforequeue(config, mode)
     loop.create_task(task)
+    logging.info("entering serving loop")
     loop.run_forever()

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

@@ -23,8 +23,11 @@ max_message_size = 31457280
 # days after which mails are unconditionally deleted
 delete_mails_after = 20
 
-# days after which users without a login are deleted (database and mails)
+# days after which large messages (>200k) are unconditionally deleted
-delete_inactive_users_after = 100
+delete_large_after = 7
+
+# days after which users without a successful login are deleted (database and mails)
+delete_inactive_users_after = 90
 
 # minimum length a username must have
 username_min_length = 9
@@ -39,21 +42,47 @@ password_min_length = 9
 passthrough_senders =
 
 # list of e-mail recipients for which to accept outbound un-encrypted mails
-passthrough_recipients = xstore@testrun.org groupsbot@hispanilandia.net
+# (space-separated, item may start with "@" to whitelist whole recipient domains)
+passthrough_recipients = xstore@testrun.org echo@{mail_domain}
 
 #
 # Deployment Details
 #
 
-# where the filtermail SMTP service listens
+# SMTP outgoing filtermail and reinjection 
 filtermail_smtp_port = 10080
-
-# postfix accepts on the localhost reinject SMTP port
 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
 
+# Defaults to https://iroh.{{mail_domain}} and running `iroh-relay` on the chatmail
+# service.
+# If you set it to anything else, the service will be disabled
+# and users will be directed to use the given iroh relay URL.
+# Set it to empty string if you want users to use their default iroh relay.
+# iroh_relay =
+
+# Address on which `mtail` listens,
+# e.g. 127.0.0.1 or some private network
+# address like 192.168.10.1.
+# You can point Prometheus
+# or some other OpenMetrics-compatible
+# collector to
+# http://{{mtail_address}}:3903/metrics
+# and display collected metrics with Grafana.
+#
+# WARNING: do not expose this service
+# to the public IP address.
+#
+# `mtail is not running if the setting is not set.
+
+# mtail_address = 127.0.0.1
+
 #
 # Debugging options 
 #

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

@@ -1,7 +1,7 @@
 
 [privacy]
 
-passthrough_recipients = privacy@testrun.org xstore@testrun.org groupsbot@hispanilandia.net
+passthrough_recipients = privacy@testrun.org xstore@testrun.org echo@{mail_domain}
 
 privacy_postal =
     Merlinux GmbH, Represented by the managing director H. Krekel,

chatmaild/src/chatmaild/metadata.py

@@ -1,5 +1,7 @@
 import logging
 import sys
+import time
+from contextlib import contextmanager
 
 from .config import read_config
 from .dictproxy import DictProxy
@@ -7,8 +9,15 @@ from .filedict import FileDict
 from .notifier import Notifier
 
 
+def _is_valid_token_timestamp(timestamp, now):
+    # Token if invalid after 90 days
+    # or if the timestamp is in the future.
+    return timestamp > now - 3600 * 24 * 90 and timestamp < now + 60
+
+
 class Metadata:
-    # each SETMETADATA on this key appends to a list of unique device tokens
+    # each SETMETADATA on this key appends to dictionary
+    # mapping of unique device tokens
     # which only ever get removed if the upstream indicates the token is invalid
     DEVICETOKEN_KEY = "devicetoken"
 
@@ -18,21 +27,51 @@ class Metadata:
     def get_metadata_dict(self, addr):
         return FileDict(self.vmail_dir / addr / "metadata.json")
 
-    def add_token_to_addr(self, addr, token):
+    @contextmanager
+    def _modify_tokens(self, addr):
         with self.get_metadata_dict(addr).modify() as data:
-            tokens = data.setdefault(self.DEVICETOKEN_KEY, [])
+            tokens = data.setdefault(self.DEVICETOKEN_KEY, {})
-            if token not in tokens:
+            now = int(time.time())
-                tokens.append(token)
+            if isinstance(tokens, list):
+                data[self.DEVICETOKEN_KEY] = tokens = {t: now for t in tokens}
+
+            expired_tokens = [
+                token
+                for token, timestamp in tokens.items()
+                if not _is_valid_token_timestamp(tokens[token], now)
+            ]
+            for expired_token in expired_tokens:
+                del tokens[expired_token]
+
+            yield tokens
+
+    def add_token_to_addr(self, addr, token):
+        with self._modify_tokens(addr) as tokens:
+            tokens[token] = int(time.time())
 
     def remove_token_from_addr(self, addr, token):
-        with self.get_metadata_dict(addr).modify() as data:
+        with self._modify_tokens(addr) as tokens:
-            tokens = data.get(self.DEVICETOKEN_KEY, [])
             if token in tokens:
-                tokens.remove(token)
+                del tokens[token]
 
     def get_tokens_for_addr(self, addr):
         mdict = self.get_metadata_dict(addr).read()
-        return mdict.get(self.DEVICETOKEN_KEY, [])
+        tokens = mdict.get(self.DEVICETOKEN_KEY, {})
+
+        now = int(time.time())
+        if isinstance(tokens, dict):
+            token_list = [
+                token
+                for token, timestamp in tokens.items()
+                if _is_valid_token_timestamp(timestamp, now)
+            ]
+            if len(token_list) < len(tokens):
+                # Some tokens have expired, remove them.
+                with self._modify_tokens(addr) as _tokens:
+                    pass
+        else:
+            token_list = []
+        return token_list
 
 
 class MetadataDictProxy(DictProxy):

chatmaild/src/chatmaild/metrics.py

@@ -11,6 +11,8 @@ def main(vmail_dir=None):
     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

chatmaild/src/chatmaild/migrate_db.py

@@ -32,7 +32,7 @@ def migrate_from_db_to_maildir(config, chunking=10000):
     # don't transfer special/CI accounts
     rows = [row for row in all_rows if row[0][:3] not in ("ci-", "ac_")]
 
-    logging.info(f"ignoring {len(all_rows)-len(rows)} CI accounts")
+    logging.info(f"ignoring {len(all_rows) - len(rows)} CI accounts")
     logging.info(f"migrating {len(rows)} sqlite database passwords to user dirs")
 
     for i, row in enumerate(rows):

chatmaild/src/chatmaild/notifier.py

@@ -17,11 +17,11 @@ and which are scheduled for retry using exponential back-off timing.
 If a token notification would be scheduled more than DROP_DEADLINE seconds
 after its first attempt, it is dropped with a log error.
 
-Note that tokens are completely opaque to the notification machinery here
+Note that tokens are opaque to the notification machinery here
-and will in the future be encrypted foreclosing all ability to distinguish
+and are encrypted foreclosing all ability to distinguish
 which device token ultimately goes to which phone-provider notification service,
 or to understand the relation of "device tokens" and chatmail addresses.
-The meaning and format of tokens is basically a matter of Delta-Chat Core and
+The meaning and format of tokens is basically a matter of chatmail Core and
 the `notification.delta.chat` service.
 """
 
@@ -95,7 +95,12 @@ class Notifier:
                 logging.warning(f"removing spurious queue item: {queue_path!r}")
                 queue_path.unlink()
                 continue
-            queue_item = PersistentQueueItem.read_from_path(queue_path)
+            try:
+                queue_item = PersistentQueueItem.read_from_path(queue_path)
+            except ValueError:
+                logging.warning(f"removing spurious queue item: {queue_path!r}")
+                queue_path.unlink()
+                continue
             self.queue_for_retry(queue_item)
 
     def queue_for_retry(self, queue_item, retry_num=0):

chatmaild/src/chatmaild/tests/mail-data/asm.eml

@@ -0,0 +1,56 @@
+From: {from_addr}
+To: {to_addr}
+Autocrypt-Setup-Message: v1
+Subject: Autocrypt Setup Message
+Date: Tue, 22 Jan 2019 12:56:29 +0100
+Content-type: multipart/mixed; boundary="Y6fyGi9SoGeH8WwRaEdC6bbBcYOedDzrQ"
+
+--Y6fyGi9SoGeH8WwRaEdC6bbBcYOedDzrQ
+Content-Type: text/plain
+
+This message contains all information to transfer your Autocrypt
+settings along with your secret key securely from your original
+device.
+
+To set up your new device for Autocrypt, please follow the
+instuctions that should be presented by your new device.
+
+You can keep this message and use it as a backup for your secret
+key. If you want to do this, you should write down the Setup Code
+and store it securely.
+--Y6fyGi9SoGeH8WwRaEdC6bbBcYOedDzrQ
+Content-Type: application/autocrypt-setup
+Content-Disposition: attachment; filename="autocrypt-setup-message.html"
+
+<html><body>
+<p>
+This is the Autocrypt setup file used to transfer settings and
+keys between clients. You can decrypt it using the Setup Code
+presented on your old device, and then import the contained key
+into your keyring.
+</p>
+
+<pre>
+-----BEGIN PGP MESSAGE-----
+Passphrase-Format: numeric9x4
+Passphrase-Begin: 17
+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+=pulM
+-----END PGP MESSAGE-----
+</pre></body></html>
+--Y6fyGi9SoGeH8WwRaEdC6bbBcYOedDzrQ--

chatmaild/src/chatmaild/tests/mail-data/literal.eml

@@ -1,44 +1,44 @@
-From: {from_addr}
+From: {from_addr}
-
+To: {to_addr}
-To: {to_addr}
+Subject: ...
-
+Date: Sun, 15 Oct 2023 16:43:21 +0000
-Subject: ...
+Message-ID: <Mr.UVyJWZmkCKM.hGzNc6glBE_@c2.testrun.org>
-
+In-Reply-To: <Mr.MvmCz-GQbi_.6FGRkhDf05c@c2.testrun.org>
-Date: Sun, 15 Oct 2023 16:43:21 +0000
+References: <Mr.3gckbNy5bch.uK3Hd2Ws6-w@c2.testrun.org>
-
+	<Mr.MvmCz-GQbi_.6FGRkhDf05c@c2.testrun.org>
-Message-ID: <Mr.UVyJWZmkCKM.hGzNc6glBE_@c2.testrun.org>
+Chat-Version: 1.0
-
+Autocrypt: addr={from_addr}; prefer-encrypt=mutual;
-In-Reply-To: <Mr.MvmCz-GQbi_.6FGRkhDf05c@c2.testrun.org>
+	keydata=xjMEZSwWjhYJKwYBBAHaRw8BAQdAQBEhqeJh0GueHB6kF/DUQqYCxARNBVokg/AzT+7LqH
-
+	rNFzxiYXJiYXpAYzIudGVzdHJ1bi5vcmc+wosEEBYIADMCGQEFAmUsFo4CGwMECwkIBwYVCAkKCwID
-References: <Mr.3gckbNy5bch.uK3Hd2Ws6-w@c2.testrun.org>
+	FgIBFiEEFTfUNvVnY3b9F7yHnmme1PfUhX8ACgkQnmme1PfUhX9A4AEAnHWHp49eBCMHK5t66gYPiW
-
+	XQuB1mwUjzGfYWB+0RXUoA/0xcQ3FbUNlGKW7Blp6eMFfViv6Mv2d3kNSXACB6nmcMzjgEZSwWjhIK
-	<Mr.MvmCz-GQbi_.6FGRkhDf05c@c2.testrun.org>
+	KwYBBAGXVQEFAQEHQBpY5L2M1XHo0uxf8SX1wNLBp/OVvidoWHQF2Jz+kJsUAwEIB8J4BBgWCAAgBQ
-
+	JlLBaOAhsMFiEEFTfUNvVnY3b9F7yHnmme1PfUhX8ACgkQnmme1PfUhX/INgEA37AJaNvruYsJVanP
-Chat-Version: 1.0
+	IXnYw4CKd55UAwl8Zcy+M2diAbkA/0fHHcGV4r78hpbbL1Os52DPOdqYQRauIeJUeG+G6bQO
-
+MIME-Version: 1.0
-Autocrypt: addr={from_addr}; prefer-encrypt=mutual;
+Content-Type: multipart/encrypted; protocol="application/pgp-encrypted";
-
+	boundary="YFrteb74qSXmggbOxZL9dRnhymywAi"
-	keydata=xjMEZSwWjhYJKwYBBAHaRw8BAQdAQBEhqeJh0GueHB6kF/DUQqYCxARNBVokg/AzT+7LqH
+
-
+
-	rNFzxiYXJiYXpAYzIudGVzdHJ1bi5vcmc+wosEEBYIADMCGQEFAmUsFo4CGwMECwkIBwYVCAkKCwID
+--YFrteb74qSXmggbOxZL9dRnhymywAi
-
+Content-Description: PGP/MIME version identification
-	FgIBFiEEFTfUNvVnY3b9F7yHnmme1PfUhX8ACgkQnmme1PfUhX9A4AEAnHWHp49eBCMHK5t66gYPiW
+Content-Type: application/pgp-encrypted
-
+
-	XQuB1mwUjzGfYWB+0RXUoA/0xcQ3FbUNlGKW7Blp6eMFfViv6Mv2d3kNSXACB6nmcMzjgEZSwWjhIK
+Version: 1
-
+
-	KwYBBAGXVQEFAQEHQBpY5L2M1XHo0uxf8SX1wNLBp/OVvidoWHQF2Jz+kJsUAwEIB8J4BBgWCAAgBQ
+
-
+--YFrteb74qSXmggbOxZL9dRnhymywAi
-	JlLBaOAhsMFiEEFTfUNvVnY3b9F7yHnmme1PfUhX8ACgkQnmme1PfUhX/INgEA37AJaNvruYsJVanP
+Content-Description: OpenPGP encrypted message
-
+Content-Disposition: inline; filename="encrypted.asc";
-	IXnYw4CKd55UAwl8Zcy+M2diAbkA/0fHHcGV4r78hpbbL1Os52DPOdqYQRauIeJUeG+G6bQO
+Content-Type: application/octet-stream; name="encrypted.asc"
-
+
-MIME-Version: 1.0
+-----BEGIN PGP MESSAGE-----
-
+
-Content-Type: multipart/encrypted; protocol="application/pgp-encrypted";
+yxJiAAAAAABIZWxsbyB3b3JsZCE=
-
+=1I/B
-	boundary="YFrteb74qSXmggbOxZL9dRnhymywAi"
+-----END PGP MESSAGE-----
-
+
-
+
-
+--YFrteb74qSXmggbOxZL9dRnhymywAi--
-
+
 

chatmaild/src/chatmaild/tests/mail-data/mailer-daemon.eml

@@ -0,0 +1,46 @@
+Date: Fri, 8 Jul 1994 09:21:47 -0400
+From: Mail Delivery Subsystem <MAILER-DAEMON@example.org>
+Subject: Returned mail: User unknown
+To: <owner-ups-mib@CS.UTK.EDU>
+Auto-Submitted: auto-replied 
+MIME-Version: 1.0
+Content-Type: multipart/report; report-type=delivery-status;
+      boundary="JAA13167.773673707/CS.UTK.EDU"
+
+--JAA13167.773673707/CS.UTK.EDU
+content-type: text/plain; charset=us-ascii
+
+   ----- The following addresses had delivery problems -----
+<arathib@vnet.ibm.com>  (unrecoverable error)
+<wsnell@sdcc13.ucsd.edu>  (unrecoverable error)
+
+--JAA13167.773673707/CS.UTK.EDU
+content-type: message/delivery-status
+
+Reporting-MTA: dns; cs.utk.edu
+
+Original-Recipient: rfc822;arathib@vnet.ibm.com
+Final-Recipient: rfc822;arathib@vnet.ibm.com
+Action: failed
+Status: 5.0.0 (permanent failure)
+Diagnostic-Code: smtp;
+ 550 'arathib@vnet.IBM.COM' is not a registered gateway user
+Remote-MTA: dns; vnet.ibm.com
+
+Original-Recipient: rfc822;johnh@hpnjld.njd.hp.com
+Final-Recipient: rfc822;johnh@hpnjld.njd.hp.com
+Action: delayed
+Status: 4.0.0 (hpnjld.njd.jp.com: host name lookup failure)
+
+Original-Recipient: rfc822;wsnell@sdcc13.ucsd.edu
+Final-Recipient: rfc822;wsnell@sdcc13.ucsd.edu
+Action: failed
+Status: 5.0.0
+Diagnostic-Code: smtp; 550 user unknown
+Remote-MTA: dns; sdcc13.ucsd.edu
+
+--JAA13167.773673707/CS.UTK.EDU
+content-type: message/rfc822
+
+[original message goes here]
+--JAA13167.773673707/CS.UTK.EDU--

chatmaild/src/chatmaild/tests/mail-data/securejoin-vc-fake.eml

@@ -0,0 +1,21 @@
+Subject: Message from {from_addr}
+From: <{from_addr}>
+To: <{to_addr}>
+Date: Sun, 15 Oct 2023 16:43:25 +0000
+Message-ID: <Mr.78MWtlV7RAi.goCFzBhCYfy@c2.testrun.org>
+Chat-Version: 1.0
+Secure-Join: vc-request
+Secure-Join-Invitenumber: RANDOM-TOKEN
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary="Gl92xgZjOShJ5PGHntqYkoo2OK2Dvi"
+
+
+--Gl92xgZjOShJ5PGHntqYkoo2OK2Dvi
+Content-Type: text/plain; charset=utf-8
+
+Buy viagra!
+
+
+--Gl92xgZjOShJ5PGHntqYkoo2OK2Dvi--
+
+

chatmaild/src/chatmaild/tests/mail-data/securejoin-vc.eml

@@ -0,0 +1,21 @@
+Subject: Message from {from_addr}
+From: <{from_addr}>
+To: <{to_addr}>
+Date: Sun, 15 Oct 2023 16:43:25 +0000
+Message-ID: <Mr.78MWtlV7RAi.goCFzBhCYfy@c2.testrun.org>
+Chat-Version: 1.0
+Secure-Join: vc-request
+Secure-Join-Invitenumber: RANDOM-TOKEN
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary="Gl92xgZjOShJ5PGHntqYkoo2OK2Dvi"
+
+
+--Gl92xgZjOShJ5PGHntqYkoo2OK2Dvi
+Content-Type: text/plain; charset=utf-8
+
+Secure-Join: vc-request
+
+
+--Gl92xgZjOShJ5PGHntqYkoo2OK2Dvi--
+
+

chatmaild/src/chatmaild/tests/plugin.py

@@ -7,6 +7,7 @@ from email.parser import BytesParser
 from pathlib import Path
 
 import pytest
+
 from chatmaild.config import read_config, write_initial_config
 
 
@@ -68,12 +69,11 @@ def maildata(request):
 
     assert datadir.exists(), datadir
 
-    def maildata(name, from_addr, to_addr, subject="..."):
+    def maildata(name, from_addr, to_addr, subject="[...]"):
         # Using `.read_bytes().decode()` instead of `.read_text()` to preserve newlines.
         data = datadir.joinpath(name).read_bytes().decode()
-
         text = data.format(from_addr=from_addr, to_addr=to_addr, subject=subject)
-        return BytesParser(policy=policy.default).parsebytes(text.encode())
+        return BytesParser(policy=policy.SMTP).parsebytes(text.encode())
 
     return maildata
 

chatmaild/src/chatmaild/tests/test_config.py

@@ -1,4 +1,5 @@
 import pytest
+
 from chatmaild.config import read_config
 
 
@@ -14,6 +15,14 @@ def test_read_config_basic(example_config):
     assert example_config.mail_domain == "chat.example.org"
 
 
+def test_read_config_basic_using_defaults(tmp_path, maildomain):
+    inipath = tmp_path.joinpath("chatmail.ini")
+    inipath.write_text(f"[params]\nmail_domain = {maildomain}")
+    example_config = read_config(inipath)
+    assert example_config.max_user_send_per_minute == 60
+    assert example_config.filtermail_smtp_port_incoming == 10081
+
+
 def test_read_config_testrun(make_config):
     config = make_config("something.testrun.org")
     assert config.mail_domain == "something.testrun.org"
@@ -26,6 +35,7 @@ def test_read_config_testrun(make_config):
     assert config.max_user_send_per_minute == 60
     assert config.max_mailbox_size == "100M"
     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

chatmaild/src/chatmaild/tests/test_doveauth.py

@@ -4,8 +4,9 @@ import queue
 import threading
 import traceback
 
-import chatmaild.doveauth
 import pytest
+
+import chatmaild.doveauth
 from chatmaild.doveauth import (
     AuthDictProxy,
     is_allowed_to_create,

chatmaild/src/chatmaild/tests/test_filtermail.py

@@ -1,10 +1,12 @@
 import pytest
+
 from chatmaild.filtermail import (
-    BeforeQueueHandler,
+    IncomingBeforeQueueHandler,
+    OutgoingBeforeQueueHandler,
     SendRateLimiter,
     check_armored_payload,
     check_encrypted,
-    common_encrypted_subjects,
+    is_securejoin,
 )
 
 
@@ -17,7 +19,13 @@ def maildomain():
 @pytest.fixture
 def handler(make_config, maildomain):
     config = make_config(maildomain)
-    return BeforeQueueHandler(config)
+    return OutgoingBeforeQueueHandler(config)
+
+
+@pytest.fixture
+def inhandler(make_config, maildomain):
+    config = make_config(maildomain)
+    return IncomingBeforeQueueHandler(config)
 
 
 def test_reject_forged_from(maildata, gencreds, handler):
@@ -28,14 +36,14 @@ def test_reject_forged_from(maildata, gencreds, handler):
     # test that the filter lets good mail through
     to_addr = gencreds()[0]
     env.content = maildata(
-        "plain.eml", from_addr=env.mail_from, to_addr=to_addr
+        "encrypted.eml", from_addr=env.mail_from, to_addr=to_addr
     ).as_bytes()
 
     assert not handler.check_DATA(envelope=env)
 
     # test that the filter rejects forged mail
     env.content = maildata(
-        "plain.eml", from_addr="forged@c3.testrun.org", to_addr=to_addr
+        "encrypted.eml", from_addr="forged@c3.testrun.org", to_addr=to_addr
     ).as_bytes()
     error = handler.check_DATA(envelope=env)
     assert "500" in error
@@ -54,19 +62,28 @@ def test_filtermail_no_encryption_detection(maildata):
     assert not check_encrypted(msg)
 
 
-def test_filtermail_encryption_detection(maildata):
+def test_filtermail_securejoin_detection(maildata):
-    for subject in common_encrypted_subjects:
+    msg = maildata(
-        msg = maildata(
+        "securejoin-vc.eml", from_addr="some@example.org", to_addr="other@example.org"
-            "encrypted.eml",
+    )
-            from_addr="1@example.org",
+    assert is_securejoin(msg)
-            to_addr="2@example.org",
-            subject=subject,
-        )
-        assert check_encrypted(msg)
 
-    # if the subject is not a known encrypted subject value, it is not considered ac-encrypted
+    msg = maildata(
-    msg.replace_header("Subject", "Click this link")
+        "securejoin-vc-fake.eml",
-    assert not check_encrypted(msg)
+        from_addr="some@example.org",
+        to_addr="other@example.org",
+    )
+    assert not is_securejoin(msg)
+
+
+def test_filtermail_encryption_detection(maildata):
+    msg = maildata(
+        "encrypted.eml",
+        from_addr="1@example.org",
+        to_addr="2@example.org",
+        subject="Subject does not matter, will be replaced anyway",
+    )
+    assert check_encrypted(msg)
 
 
 def test_filtermail_no_literal_packets(maildata):
@@ -96,7 +113,7 @@ def test_send_rate_limiter():
             break
 
 
-def test_excempt_privacy(maildata, gencreds, handler):
+def test_cleartext_excempt_privacy(maildata, gencreds, handler):
     from_addr = gencreds()[0]
     to_addr = "privacy@testrun.org"
     handler.config.passthrough_recipients = [to_addr]
@@ -117,10 +134,97 @@ def test_excempt_privacy(maildata, gencreds, handler):
         rcpt_tos = [to_addr, false_to]
         content = msg.as_bytes()
 
-    assert "500" in handler.check_DATA(envelope=env2)
+    assert "523" in handler.check_DATA(envelope=env2)
 
 
-def test_passthrough_senders(gencreds, handler, maildata):
+def test_cleartext_self_send_autocrypt_setup_message(maildata, gencreds, handler):
+    from_addr = gencreds()[0]
+    to_addr = from_addr
+
+    msg = maildata("asm.eml", from_addr=from_addr, to_addr=to_addr)
+
+    class env:
+        mail_from = from_addr
+        rcpt_tos = [to_addr]
+        content = msg.as_bytes()
+
+    assert not handler.check_DATA(envelope=env)
+
+
+def test_cleartext_send_fails(maildata, gencreds, handler):
+    from_addr = gencreds()[0]
+    to_addr = gencreds()[0]
+
+    msg = maildata("plain.eml", from_addr=from_addr, to_addr=to_addr)
+
+    class env:
+        mail_from = from_addr
+        rcpt_tos = [to_addr]
+        content = msg.as_bytes()
+
+    res = handler.check_DATA(envelope=env)
+    assert "523 Encryption Needed" in res
+
+
+def test_cleartext_incoming_fails(maildata, gencreds, inhandler):
+    from_addr = gencreds()[0]
+    to_addr, password = gencreds()
+
+    msg = maildata("plain.eml", from_addr=from_addr, to_addr=to_addr)
+
+    class env:
+        mail_from = from_addr
+        rcpt_tos = [to_addr]
+        content = msg.as_bytes()
+
+    user = inhandler.config.get_user(to_addr)
+    user.set_password(password)
+    res = inhandler.check_DATA(envelope=env)
+    assert "523 Encryption Needed" in res
+
+    user.allow_incoming_cleartext()
+    assert not inhandler.check_DATA(envelope=env)
+
+
+def test_cleartext_incoming_mailer_daemon(maildata, gencreds, inhandler):
+    from_addr = "mailer-daemon@example.org"
+    to_addr = gencreds()[0]
+
+    msg = maildata("mailer-daemon.eml", from_addr=from_addr, to_addr=to_addr)
+
+    class env:
+        mail_from = from_addr
+        rcpt_tos = [to_addr]
+        content = msg.as_bytes()
+
+    assert not inhandler.check_DATA(envelope=env)
+
+
+def test_cleartext_passthrough_domains(maildata, gencreds, handler):
+    from_addr = gencreds()[0]
+    to_addr = "privacy@x.y.z"
+    handler.config.passthrough_recipients = ["@x.y.z"]
+    false_to = "something@x.y"
+
+    msg = maildata("plain.eml", from_addr=from_addr, to_addr=to_addr)
+
+    class env:
+        mail_from = from_addr
+        rcpt_tos = [to_addr]
+        content = msg.as_bytes()
+
+    # assert that None/no error is returned
+    assert not handler.check_DATA(envelope=env)
+
+    class env2:
+        mail_from = from_addr
+        rcpt_tos = [to_addr, false_to]
+        content = msg.as_bytes()
+
+    assert "523" in handler.check_DATA(envelope=env2)
+
+
+def test_cleartext_passthrough_senders(gencreds, handler, maildata):
     acc1 = gencreds()[0]
     to_addr = "recipient@something.org"
     handler.config.passthrough_senders = [acc1]
@@ -171,10 +275,20 @@ UN4fiB0KR9JyG2ayUdNJVkXZSZLnHyRgiaadlpUo16LVvw==\r
 =b5Kp\r
 -----END PGP MESSAGE-----\r
 \r
+\r
 """
 
     assert check_armored_payload(payload) == True
 
+    payload = payload.removesuffix("\r\n")
+    assert check_armored_payload(payload) == True
+
+    payload = payload.removesuffix("\r\n")
+    assert check_armored_payload(payload) == True
+
+    payload = payload.removesuffix("\r\n")
+    assert check_armored_payload(payload) == True
+
     payload = """-----BEGIN PGP MESSAGE-----\r
 \r
 HELLOWORLD
@@ -190,3 +304,45 @@ HELLOWORLD
 \r
 """
     assert check_armored_payload(payload) == False
+
+    # Test payload using partial body length
+    # as generated by GopenPGP.
+    payload = """-----BEGIN PGP MESSAGE-----\r
+\r
+wV4DdCVjRfOT3TQSAQdAY5+pjT6mlCxPGdR3be4w7oJJRUGIPI/Vnh+mJxGSm34w\r
+LNlVc89S1g22uQYFif2sUJsQWbpoHpNkuWpkSgOaHmNvrZiY/YU5iv+cZ3LbmtUG\r
+0uoBisSHh9O1c+5sYZSbrvYZ1NOwlD7Fv/U5/Mw4E5+CjxfdgNGp5o3DDddzPK78\r
+jseDhdSXxnaiIJC93hxNX6R1RPt3G2gukyzx69wciPQShcF8zf3W3o75Ed7B8etV\r
+QEeB16xzdFhKa9JxdjTu3osgCs21IO7wpcFkjc7nZzlW6jPnELJJaNmv4yOOCjMp\r
+6YAkaN/BkL+jHTznHDuDsT5ilnTXpwHDU1Cm9PIx/KFcNCQnIB+2DcdIHPHUH1ci\r
+jvqoeXAVWjKXEjS7PqPFuP/xGbrWG2ugs+toXJOKbgRkExvKs1dwPFKrgghvCVbW\r
+AcKejQKAPArLwpkA7aD875TZQShvGt74fNs45XBlGOYOnNOAJ1KAmzrXLIDViyyB\r
+kDsmTBk785xofuCkjBpXSe6vsMprPzCteDfaUibh8FHeJjucxPerwuOPEmnogNaf\r
+YyL4+iy8H8I9/p7pmUqILprxTG0jTOtlk0bTVzeiF56W1xbtSEMuOo4oFbQTyOM2\r
+bKXaYo774Jm+rRtKAnnI2dtf9RpK19cog6YNzfYjesLKbXDsPZbN5rmwyFiCvvxC\r
+kQ6JLob+B2fPdY2gzy7LypxktS8Zi1HJcWDHJGVmQodaDLqKUObb4M26bXDe6oxI\r
+NS8PJz5exVbM3KhZnUOEn6PJRBBf5a/ZqxlhZPcQo/oBuhKpBRpO5kSDwPIUByu3\r
+UlXLSkpMqe9pUarAOEuQjfl2RVY7U+RrQYp4YP5keMO+i8NCefAFbowTTufO1JIq\r
+2nVgCi/QVnxZyEc9OYt/8AE3g4cdojE+vsSDifZLSWYIetpfrohHv3dT3StD1QRG\r
+0QE6qq6oKpg/IL0cjvuX4c7a7bslv2fXp8t75y37RU6253qdIebhxc/cRhPbc/yu\r
+p0YLyD4SrvKTLP2ZV95jT4IPEpqm4AN3QmiOzdtqR2gLyb62L8QfqI/FdwsIiRiM\r
+hqydwoqt/lfSqG1WKPh+6EkMkH+TDiCC1BQdbN1MNcyUtcjb35PR2c8Ld2TF3guA\r
+jLIqMt/Vb7hBoMb2FcsOYY25ka9oV62OwgKWLXnFzk+modMR5fzb4kxVVAYEqP+D\r
+T5KO1Vs76v1fyPGOq6BbBCvLwTqe/e6IZInJles4v5jrhnLcGKmNGivCUDe6X6NY\r
+UKNt5RsZllwDQpaAb5dMNhyrk8SgIE7TBI7rvqIdUCE52Vy+0JDxFg5olRpFUfO6\r
+/MyTW3Yo/ekk/npHr7iYYqJTCc21bDGLWQcIo/XO7WPxrKNWGBNPFnkRdw0MaKr4\r
++cEM3V8NFnSEpC12xA+RX/CezuJtwXZK5MpG76eYqMO6qyC+c25YcFecEufDZDxx\r
+ZLqRszVRyxyWPtk/oIeQK2v9wOqY6N9/ff01gHz69vqYqN5bUw/QKZsmx1zW+gPw\r
+6x2tDK2BHeYl182gCbhlKISRFwCtbjqZSkiKWao/VtygHkw0fK34avJuyQ/X9YaN\r
+BRy+7Lf3VA53pnB5WJ1xwRXN8VDvmZeXzv2krHveCMemj0OjnRoCLu117xN0A5m9\r
+Fm/RoDix5PolDHtWTtr2m1n2hp2LHnj8at9lFEd0SKhAYHVL9KjzycwWODZRXt+x\r
+zGDDuooEeTvdY5NLyKcl4gETz1ZP4Ez5jGGjhPSwSpq1mU7UaJ9ZXXdr4KHyifW6\r
+ggNzNsGhXTap7IWZpTtqXABydfiBshmH2NjqtNDwBweJVSgP10+r0WhMWlaZs6xl\r
+V3o5yskJt6GlkwpJxZrTvN6Tiww/eW7HFV6NGf7IRSWY5tJc/iA7/92tOmkdvJ1q\r
+myLbG7cJB787QjplEyVe2P/JBO6xYvbkJLf9Q+HaviTO25rugRSrYsoKMDfO8VlQ\r
+1CcnTPVtApPZJEQzAWJEgVAM8uIlkqWJJMgyWT34sTkdBeCUFGloXQFs9Yxd0AGf\r
+/zHEkYZSTKpVSvAIGu4=\r
+=6iHb\r
+-----END PGP MESSAGE-----\r
+"""
+    assert check_armored_payload(payload) == True

chatmaild/src/chatmaild/tests/test_metadata.py

@@ -3,6 +3,7 @@ import time
 
 import pytest
 import requests
+
 from chatmaild.metadata import (
     Metadata,
     MetadataDictProxy,
@@ -241,6 +242,22 @@ def test_requeue_removes_tmp_files(notifier, metadata, testaddr, caplog):
     assert queue_item.addr == testaddr
 
 
+def test_requeue_removes_invalid_files(notifier, metadata, testaddr, caplog):
+    metadata.add_token_to_addr(testaddr, "01234")
+    notifier.new_message_for_addr(testaddr, metadata)
+    # empty/invalid files should be ignored
+    p = notifier.queue_dir.joinpath("1203981203")
+    p.touch()
+    notifier2 = notifier.__class__(notifier.queue_dir)
+    notifier2.requeue_persistent_queue_items()
+    assert "spurious" in caplog.records[0].msg
+    assert not p.exists()
+    assert notifier2.retry_queues[0].qsize() == 1
+    when, queue_item = notifier2.retry_queues[0].get()
+    assert when <= int(time.time())
+    assert queue_item.addr == testaddr
+
+
 def test_start_and_stop_notification_threads(notifier, testaddr):
     threads = notifier.start_notification_threads(None)
     for retry_num, threadlist in threads.items():

chatmaild/src/chatmaild/tests/test_metrics.py

@@ -2,8 +2,15 @@ from chatmaild.metrics import main
 
 
 def test_main(tmp_path, capsys):
+    paths = []
     for x in ("ci-asllkj", "ac_12l3kj", "qweqwe", "ci-l1k2j31l2k3"):
-        tmp_path.joinpath(x).mkdir()
+        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 = {}

chatmaild/src/chatmaild/tests/test_user.py

@@ -40,3 +40,17 @@ def test_no_mailboxes_dir(testaddr, example_config, tmp_path):
     user.set_password("someeqkjwelkqwjleqwe")
     user.set_last_login_timestamp(100000)
     assert user.get_last_login_timestamp() == 86400
+
+
+def test_set_get_cleartext_flag(testaddr, example_config, tmp_path):
+    p = tmp_path.joinpath("a", "mailboxes")
+    example_config.mailboxes_dir = p
+
+    user = example_config.get_user(testaddr)
+    user.set_password("someeqkjwelkqwjleqwe")
+    user.set_last_login_timestamp(100000)
+    assert user.get_last_login_timestamp() == 86400
+
+    assert not user.is_incoming_cleartext_ok()
+    user.allow_incoming_cleartext()
+    assert user.is_incoming_cleartext_ok()

chatmaild/src/chatmaild/user.py

@@ -13,6 +13,7 @@ class User:
         self.maildir = maildir
         self.addr = addr
         self.password_path = password_path
+        self.enforce_E2EE_path = maildir.joinpath("enforceE2EEincoming")
         self.uid = uid
         self.gid = gid
 
@@ -35,6 +36,13 @@ class User:
         home = str(self.maildir)
         return dict(addr=self.addr, home=home, uid=self.uid, gid=self.gid, password=pw)
 
+    def is_incoming_cleartext_ok(self):
+        return not self.enforce_E2EE_path.exists()
+
+    def allow_incoming_cleartext(self):
+        if self.enforce_E2EE_path.exists():
+            self.enforce_E2EE_path.unlink()
+
     def set_password(self, enc_password):
         """Set the specified password for this user.
 
@@ -50,6 +58,8 @@ class User:
             if not self.addr.startswith("echo@"):
                 logging.error(f"could not write password for: {self.addr}")
                 raise
+        if not self.addr.startswith("echo@"):
+            self.enforce_E2EE_path.touch()
 
     def set_last_login_timestamp(self, timestamp):
         """Track login time with daily granularity

cmdeploy/pyproject.toml

@@ -41,3 +41,6 @@ lint.select = [
   "PLE", # Pylint Error
   "PLW", # Pylint Warning
 ]
+lint.ignore = [
+  "PLC0415" # import-outside-top-level
+]

cmdeploy/src/cmdeploy/__init__.py

@@ -7,17 +7,35 @@ import io
 import shutil
 import subprocess
 import sys
+from io import StringIO
 from pathlib import Path
 
 from chatmaild.config import Config, read_config
-from pyinfra import host
+from pyinfra import facts, host
+from pyinfra.api import FactBase
 from pyinfra.facts.files import File
+from pyinfra.facts.server import Sysctl
 from pyinfra.facts.systemd import SystemdEnabled
 from pyinfra.operations import apt, files, pip, server, systemd
 
 from .acmetool import deploy_acmetool
 
 
+class Port(FactBase):
+    """
+    Returns the process occuping a port.
+    """
+
+    def command(self, port: int) -> str:
+        return (
+            "ss -lptn 'src :%d' | awk 'NR>1 {print $6,$7}' | sed 's/users:((\"//;s/\".*//'"
+            % (port,)
+        )
+
+    def process(self, output: [str]) -> str:
+        return output[0]
+
+
 def _build_chatmaild(dist_dir) -> None:
     dist_dir = Path(dist_dir).resolve()
     if dist_dir.exists():
@@ -78,6 +96,11 @@ def _install_remote_venv_with_chatmaild(config) -> None:
         always_copy=True,
     )
 
+    apt.packages(
+        name="install gcc and headers to build crypt_r source package",
+        packages=["gcc", "python3-dev"],
+    )
+
     server.shell(
         name=f"forced pip-install {dist_file.name}",
         commands=[
@@ -101,12 +124,14 @@ def _install_remote_venv_with_chatmaild(config) -> None:
     for fn in (
         "doveauth",
         "filtermail",
+        "filtermail-incoming",
         "echobot",
         "chatmail-metadata",
         "lastlogin",
     ):
+        execpath = fn if fn != "filtermail-incoming" else "filtermail"
         params = dict(
-            execpath=f"{remote_venv_dir}/bin/{fn}",
+            execpath=f"{remote_venv_dir}/bin/{execpath}",
             config_path=remote_chatmail_inipath,
             remote_venv_dir=remote_venv_dir,
             mail_domain=config.mail_domain,
@@ -210,51 +235,37 @@ def _configure_opendkim(domain: str, dkim_selector: str = "dkim") -> bool:
         server.shell(
             name="Generate OpenDKIM domain keys",
             commands=[
-                f"opendkim-genkey -D /etc/dkimkeys -d {domain} -s {dkim_selector}"
+                f"/usr/sbin/opendkim-genkey -D /etc/dkimkeys -d {domain} -s {dkim_selector}"
             ],
-            _sudo=True,
+            _use_su_login=True,
-            _sudo_user="opendkim",
+            _su_user="opendkim",
         )
 
+    service_file = files.put(
+        name="Configure opendkim to restart once a day",
+        src=importlib.resources.files(__package__).joinpath("opendkim/systemd.conf"),
+        dest="/etc/systemd/system/opendkim.service.d/10-prevent-memory-leak.conf",
+    )
+    need_restart |= service_file.changed
+
     return need_restart
 
 
-def _install_mta_sts_daemon() -> bool:
+def _uninstall_mta_sts_daemon() -> None:
-    need_restart = False
+    # Remove configuration.
+    files.file("/etc/mta-sts-daemon.yml", present=False)
 
-    config = files.put(
+    files.directory("/usr/local/lib/postfix-mta-sts-resolver", present=False)
-        name="upload postfix-mta-sts-resolver config",
+
-        src=importlib.resources.files(__package__).joinpath(
+    files.file("/etc/systemd/system/mta-sts-daemon.service", present=False)
-            "postfix/mta-sts-daemon.yml"
+
-        ),
+    systemd.service(
-        dest="/etc/mta-sts-daemon.yml",
+        name="Stop MTA-STS daemon",
-        user="root",
+        service="mta-sts-daemon.service",
-        group="root",
+        daemon_reload=True,
-        mode="644",
+        running=False,
+        enabled=False,
     )
-    need_restart |= config.changed
-
-    server.shell(
-        name="install postfix-mta-sts-resolver with pip",
-        commands=[
-            "python3 -m virtualenv /usr/local/lib/postfix-mta-sts-resolver",
-            "/usr/local/lib/postfix-mta-sts-resolver/bin/pip install postfix-mta-sts-resolver",
-        ],
-    )
-
-    systemd_unit = files.put(
-        name="upload mta-sts-daemon systemd unit",
-        src=importlib.resources.files(__package__).joinpath(
-            "postfix/mta-sts-daemon.service"
-        ),
-        dest="/etc/systemd/system/mta-sts-daemon.service",
-        user="root",
-        group="root",
-        mode="644",
-    )
-    need_restart |= systemd_unit.changed
-
-    return need_restart
 
 
 def _configure_postfix(config: Config, debug: bool = False) -> bool:
@@ -307,6 +318,40 @@ def _configure_postfix(config: Config, debug: bool = False) -> bool:
     return need_restart
 
 
+def _install_dovecot_package(package: str, arch: str):
+    arch = "amd64" if arch == "x86_64" else arch
+    arch = "arm64" if arch == "aarch64" else arch
+    url = f"https://download.delta.chat/dovecot/staging-drop-libicu/dovecot-{package}_2.3.21%2Bdfsg1-3_{arch}.deb"
+    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
+
+    files.download(
+        name=f"Download dovecot-{package}",
+        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)
+
+
 def _configure_dovecot(config: Config, debug: bool = False) -> bool:
     """Configures Dovecot IMAP server."""
     need_restart = False
@@ -354,6 +399,10 @@ def _configure_dovecot(config: Config, debug: bool = False) -> bool:
     # it is recommended to set the following inotify limits
     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,
@@ -361,6 +410,13 @@ def _configure_dovecot(config: Config, debug: bool = False) -> bool:
             persist=True,
         )
 
+    timezone_env = files.line(
+        name="Set TZ environment variable",
+        path="/etc/environment",
+        line="TZ=:/etc/localtime",
+    )
+    need_restart |= timezone_env.changed
+
     return need_restart
 
 
@@ -441,10 +497,122 @@ def check_config(config):
     return config
 
 
-def deploy_chatmail(config_path: Path) -> None:
+def deploy_mtail(config):
+    # Uninstall mtail package, we are going to install a static binary.
+    apt.packages(name="Uninstall mtail", packages=["mtail"], present=False)
+
+    (url, sha256sum) = {
+        "x86_64": (
+            "https://github.com/google/mtail/releases/download/v3.0.8/mtail_3.0.8_linux_amd64.tar.gz",
+            "123c2ee5f48c3eff12ebccee38befd2233d715da736000ccde49e3d5607724e4",
+        ),
+        "aarch64": (
+            "https://github.com/google/mtail/releases/download/v3.0.8/mtail_3.0.8_linux_arm64.tar.gz",
+            "aa04811c0929b6754408676de520e050c45dddeb3401881888a092c9aea89cae",
+        ),
+    }[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",
+        ],
+    )
+
+    # 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=importlib.resources.files(__package__).joinpath("mtail/mtail.service.j2"),
+        dest="/etc/systemd/system/mtail.service",
+        user="root",
+        group="root",
+        mode="644",
+        address=config.mtail_address or "127.0.0.1",
+        port=3903,
+    )
+
+    mtail_conf = files.put(
+        name="Mtail configuration",
+        src=importlib.resources.files(__package__).joinpath(
+            "mtail/delivered_mail.mtail"
+        ),
+        dest="/etc/mtail/delivered_mail.mtail",
+        user="root",
+        group="root",
+        mode="644",
+    )
+
+    systemd.service(
+        name="Start and enable mtail",
+        service="mtail.service",
+        running=bool(config.mtail_address),
+        enabled=bool(config.mtail_address),
+        restarted=mtail_conf.changed,
+    )
+
+
+def deploy_iroh_relay(config) -> None:
+    (url, sha256sum) = {
+        "x86_64": (
+            "https://github.com/n0-computer/iroh/releases/download/v0.28.1/iroh-relay-v0.28.1-x86_64-unknown-linux-musl.tar.gz",
+            "2ffacf7c0622c26b67a5895ee8e07388769599f60e5f52a3bd40a3258db89b2c",
+        ),
+        "aarch64": (
+            "https://github.com/n0-computer/iroh/releases/download/v0.28.1/iroh-relay-v0.28.1-aarch64-unknown-linux-musl.tar.gz",
+            "b915037bcc1ff1110cc9fcb5de4a17c00ff576fd2f568cd339b3b2d54c420dc4",
+        ),
+    }[host.get_fact(facts.server.Arch)]
+
+    apt.packages(
+        name="Install curl",
+        packages=["curl"],
+    )
+
+    server.shell(
+        name="Download iroh-relay",
+        commands=[
+            f"(echo '{sha256sum} /usr/local/bin/iroh-relay' | sha256sum -c) || (curl -L {url} | gunzip | tar -x -f - ./iroh-relay -O >/usr/local/bin/iroh-relay.new && mv /usr/local/bin/iroh-relay.new /usr/local/bin/iroh-relay)",
+            "chmod 755 /usr/local/bin/iroh-relay",
+        ],
+    )
+
+    need_restart = False
+
+    systemd_unit = files.put(
+        name="Upload iroh-relay systemd unit",
+        src=importlib.resources.files(__package__).joinpath("iroh-relay.service"),
+        dest="/etc/systemd/system/iroh-relay.service",
+        user="root",
+        group="root",
+        mode="644",
+    )
+    need_restart |= systemd_unit.changed
+
+    iroh_config = files.put(
+        name="Upload iroh-relay config",
+        src=importlib.resources.files(__package__).joinpath("iroh-relay.toml"),
+        dest="/etc/iroh-relay.toml",
+        user="root",
+        group="root",
+        mode="644",
+    )
+    need_restart |= iroh_config.changed
+
+    systemd.service(
+        name="Start and enable iroh-relay",
+        service="iroh-relay.service",
+        running=True,
+        enabled=config.enable_iroh_relay,
+        restarted=need_restart,
+    )
+
+
+def deploy_chatmail(config_path: Path, disable_mail: bool) -> None:
     """Deploy a chat-mail instance.
 
     :param config_path: path to chatmail.ini
+    :param disable_mail: whether to disable postfix & dovecot
     """
     config = read_config(config_path)
     check_config(config)
@@ -454,7 +622,6 @@ def deploy_chatmail(config_path: Path) -> None:
 
     server.group(name="Create vmail group", group="vmail", system=True)
     server.user(name="Create vmail user", user="vmail", group="vmail", system=True)
-    server.user(name="Create filtermail user", user="filtermail", system=True)
     server.group(name="Create opendkim group", group="opendkim", system=True)
     server.user(
         name="Create opendkim user",
@@ -469,6 +636,7 @@ def deploy_chatmail(config_path: Path) -> None:
         system=True,
     )
     server.user(name="Create echobot user", user="echobot", system=True)
+    server.user(name="Create iroh user", user="iroh", system=True)
 
     # Add our OBS repository for dovecot_no_delay
     files.put(
@@ -485,10 +653,17 @@ def deploy_chatmail(config_path: Path) -> None:
         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,
-        ensure_newline=True,
+        present=False,
     )
 
+    if host.get_fact(Port, port=53) != "unbound":
+        files.line(
+            name="Add 9.9.9.9 to resolv.conf",
+            path="/etc/resolv.conf",
+            line="nameserver 9.9.9.9",
+        )
     apt.update(name="apt update", cache_time=24 * 3600)
+    apt.upgrade(name="upgrade apt packages", auto_remove=True)
 
     apt.packages(
         name="Install rsync",
@@ -498,6 +673,12 @@ def deploy_chatmail(config_path: Path) -> None:
     # Run local DNS resolver `unbound`.
     # `resolvconf` takes care of setting up /etc/resolv.conf
     # to use 127.0.0.1 as the resolver.
+    from cmdeploy.cmdeploy import Out
+
+    process_on_53 = host.get_fact(Port, port=53)
+    if process_on_53 not in (None, "unbound"):
+        Out().red(f"Can't install unbound: port 53 is occupied by: {process_on_53}")
+        exit(1)
     apt.packages(
         name="Install unbound",
         packages=["unbound", "unbound-anchor", "dnsutils"],
@@ -516,9 +697,12 @@ def deploy_chatmail(config_path: Path) -> None:
         enabled=True,
     )
 
+    deploy_iroh_relay(config)
+
     # Deploy acmetool to have TLS certificates.
+    tls_domains = [mail_domain, f"mta-sts.{mail_domain}", f"www.{mail_domain}"]
     deploy_acmetool(
-        domains=[mail_domain, f"mta-sts.{mail_domain}", f"www.{mail_domain}"],
+        domains=tls_domains,
     )
 
     apt.packages(
@@ -532,10 +716,10 @@ def deploy_chatmail(config_path: Path) -> None:
         packages="postfix",
     )
 
-    apt.packages(
+    if not "dovecot.service" in host.get_fact(SystemdEnabled):
-        name="Install Dovecot",
+        _install_dovecot_package("core", host.get_fact(facts.server.Arch))
-        packages=["dovecot-imapd", "dovecot-lmtpd"],
+        _install_dovecot_package("imapd", host.get_fact(facts.server.Arch))
-    )
+        _install_dovecot_package("lmtpd", host.get_fact(facts.server.Arch))
 
     apt.packages(
         name="Install nginx",
@@ -558,8 +742,8 @@ def deploy_chatmail(config_path: Path) -> None:
     debug = False
     dovecot_need_restart = _configure_dovecot(config, debug=debug)
     postfix_need_restart = _configure_postfix(config, debug=debug)
-    mta_sts_need_restart = _install_mta_sts_daemon()
     nginx_need_restart = _configure_nginx(config)
+    _uninstall_mta_sts_daemon()
 
     _remove_rspamd()
     opendkim_need_restart = _configure_opendkim(mail_domain, "opendkim")
@@ -569,35 +753,27 @@ def deploy_chatmail(config_path: Path) -> None:
         service="opendkim.service",
         running=True,
         enabled=True,
+        daemon_reload=opendkim_need_restart,
         restarted=opendkim_need_restart,
     )
 
-    systemd.service(
-        name="Start and enable MTA-STS daemon",
-        service="mta-sts-daemon.service",
-        daemon_reload=True,
-        running=True,
-        enabled=True,
-        restarted=mta_sts_need_restart,
-    )
-
     # Dovecot should be started before Postfix
     # because it creates authentication socket
     # required by Postfix.
     systemd.service(
-        name="Start and enable Dovecot",
+        name="disable dovecot for now" if disable_mail else "Start and enable Dovecot",
         service="dovecot.service",
-        running=True,
+        running=False if disable_mail else True,
-        enabled=True,
+        enabled=False if disable_mail else True,
-        restarted=dovecot_need_restart,
+        restarted=dovecot_need_restart if not disable_mail else False,
     )
 
     systemd.service(
-        name="Start and enable Postfix",
+        name="disable postfix for now" if disable_mail else "Start and enable Postfix",
         service="postfix.service",
-        running=True,
+        running=False if disable_mail else True,
-        enabled=True,
+        enabled=False if disable_mail else True,
-        restarted=postfix_need_restart,
+        restarted=postfix_need_restart if not disable_mail else False,
     )
 
     systemd.service(
@@ -630,8 +806,23 @@ def deploy_chatmail(config_path: Path) -> None:
         enabled=True,
         restarted=journald_conf.changed,
     )
+    files.directory(
+        name="Ensure old logs on disk are deleted",
+        path="/var/log/journal/",
+        present=False,
+    )
 
     apt.packages(
         name="Ensure cron is installed",
         packages=["cron"],
     )
+    git_hash = subprocess.check_output(["git", "rev-parse", "HEAD"]).decode()
+    git_diff = subprocess.check_output(["git", "diff"]).decode()
+    files.put(
+        name="Upload chatmail relay git commiit hash",
+        src=StringIO(git_hash + git_diff),
+        dest="/etc/chatmail-version",
+        mode="700",
+    )
+
+    deploy_mtail(config)

cmdeploy/src/cmdeploy/acmetool/__init__.py

@@ -70,6 +70,6 @@ def deploy_acmetool(email="", domains=[]):
     )
 
     server.shell(
-        name=f"Request certificate for: { ', '.join(domains) }",
+        name=f"Request certificate for: {', '.join(domains)}",
-        commands=[f"acmetool want --xlog.severity=debug { ' '.join(domains)}"],
+        commands=[f"acmetool want --xlog.severity=debug {' '.join(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-v1.4-April-3-2024.pdf": true
+"acme-agreement:https://letsencrypt.org/documents/LE-SA-v1.5-February-24-2025.pdf": true

cmdeploy/src/cmdeploy/chatmail.zone.j2

@@ -16,11 +16,11 @@ www.{{ mail_domain }}.               CNAME {{ mail_domain }}.
 ;
 ; Recommended DNS entries for interoperability and security-hardening
 ;
-{{ mail_domain }}.                   TXT "v=spf1 a:{{ mail_domain }} ~all"
+{{ 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 128 issue "letsencrypt.org;accounturi={{ acme_account_url }}"
+{{ mail_domain }}.                   CAA 0 issue "letsencrypt.org;accounturi={{ acme_account_url }}"
 {% endif %}
 _adsp._domainkey.{{ mail_domain }}.  TXT "dkim=discardable"
 

cmdeploy/src/cmdeploy/cmdeploy.py

@@ -18,7 +18,7 @@ from chatmaild.config import read_config, write_initial_config
 from packaging import version
 from termcolor import colored
 
-from . import dns, remote_funcs
+from . import dns, remote
 from .sshexec import SSHExec
 
 #
@@ -52,34 +52,53 @@ def run_cmd_options(parser):
         action="store_true",
         help="don't actually modify the server",
     )
+    parser.add_argument(
+        "--disable-mail",
+        dest="disable_mail",
+        action="store_true",
+        help="install/upgrade the server, but disable postfix & dovecot for now",
+    )
+    parser.add_argument(
+        "--ssh-host",
+        dest="ssh_host",
+        help="specify an SSH host to deploy to; uses mail_domain from chatmail.ini by default",
+    )
 
 
 def run_cmd(args, out):
     """Deploy chatmail services on the remote server."""
 
     sshexec = args.get_sshexec()
+    require_iroh = args.config.enable_iroh_relay
     remote_data = dns.get_initial_remote_data(sshexec, args.config.mail_domain)
     if not dns.check_initial_remote_data(remote_data, print=out.red):
         return 1
 
     env = os.environ.copy()
     env["CHATMAIL_INI"] = args.inipath
+    env["CHATMAIL_DISABLE_MAIL"] = "True" if args.disable_mail else ""
+    env["CHATMAIL_REQUIRE_IROH"] = "True" if require_iroh else ""
     deploy_path = importlib.resources.files(__package__).joinpath("deploy.py").resolve()
     pyinf = "pyinfra --dry" if args.dry_run else "pyinfra"
-    cmd = f"{pyinf} --ssh-user root {args.config.mail_domain} {deploy_path} -y"
+    ssh_host = args.config.mail_domain if not args.ssh_host else args.ssh_host
+    cmd = f"{pyinf} --ssh-user root {ssh_host} {deploy_path} -y"
     if version.parse(pyinfra.__version__) < version.parse("3"):
         out.red("Please re-run scripts/initenv.sh to update pyinfra to version 3.")
         return 1
 
-    retcode = out.check_call(cmd, env=env)
+    try:
-    if retcode == 0:
+        retcode = out.check_call(cmd, env=env)
-        out.green("Deploy completed, call `cmdeploy dns` next.")
+        if retcode == 0:
-    elif not remote_data["acme_account_url"]:
+            out.green("Deploy completed, call `cmdeploy dns` next.")
-        out.red("Deploy completed but letsencrypt not configured")
+        elif not remote_data["acme_account_url"]:
-        out.red("Run 'cmdeploy run' again")
+            out.red("Deploy completed but letsencrypt not configured")
-        retcode = 0
+            out.red("Run 'cmdeploy run' again")
-    else:
+            retcode = 0
+        else:
+            out.red("Deploy failed")
+    except subprocess.CalledProcessError:
         out.red("Deploy failed")
+        retcode = 1
     return retcode
 
 
@@ -132,7 +151,7 @@ def status_cmd(args, out):
     else:
         out.red("no privacy settings")
 
-    for line in sshexec(remote_funcs.get_systemd_running):
+    for line in sshexec(remote.rshell.get_systemd_running):
         print(line)
 
 
@@ -313,7 +332,7 @@ def main(args=None):
 
     def get_sshexec():
         print(f"[ssh] login to {args.config.mail_domain}")
-        return SSHExec(args.config.mail_domain, remote_funcs, verbose=args.verbose)
+        return SSHExec(args.config.mail_domain, verbose=args.verbose)
 
     args.get_sshexec = get_sshexec
 

cmdeploy/src/cmdeploy/deploy.py

@@ -11,8 +11,9 @@ def main():
         "CHATMAIL_INI",
         importlib.resources.files("cmdeploy").joinpath("../../../chatmail.ini"),
     )
+    disable_mail = bool(os.environ.get("CHATMAIL_DISABLE_MAIL"))
 
-    deploy_chatmail(config_path)
+    deploy_chatmail(config_path, disable_mail)
 
 
 if pyinfra.is_cli:

cmdeploy/src/cmdeploy/dns.py

@@ -3,22 +3,25 @@ import importlib
 
 from jinja2 import Template
 
-from . import remote_funcs
+from . import remote
 
 
 def get_initial_remote_data(sshexec, mail_domain):
     return sshexec.logged(
-        call=remote_funcs.perform_initial_checks, kwargs=dict(mail_domain=mail_domain)
+        call=remote.rdns.perform_initial_checks, kwargs=dict(mail_domain=mail_domain)
     )
 
 
-def check_initial_remote_data(remote_data, print=print):
+def check_initial_remote_data(remote_data, *, print=print):
     mail_domain = remote_data["mail_domain"]
     if not remote_data["A"] and not remote_data["AAAA"]:
         print(f"Missing A and/or AAAA DNS records for {mail_domain}!")
-    elif not remote_data["MTA_STS"]:
+    elif remote_data["MTA_STS"] != f"{mail_domain}.":
         print("Missing MTA-STS CNAME record:")
-        print(f"mta-sts.{mail_domain}.   CNAME  {mail_domain}")
+        print(f"mta-sts.{mail_domain}.   CNAME  {mail_domain}.")
+    elif remote_data["WWW"] != f"{mail_domain}.":
+        print("Missing www CNAME record:")
+        print(f"www.{mail_domain}.   CNAME  {mail_domain}.")
     else:
         return remote_data
 
@@ -26,7 +29,7 @@ def check_initial_remote_data(remote_data, print=print):
 def get_filled_zone_file(remote_data):
     sts_id = remote_data.get("sts_id")
     if not sts_id:
-        sts_id = datetime.datetime.now().strftime("%Y%m%d%H%M")
+        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()
@@ -42,19 +45,27 @@ def check_full_zone(sshexec, remote_data, out, zonefile) -> int:
     and return (exitcode, remote_data) tuple."""
 
     required_diff, recommended_diff = sshexec.logged(
-        remote_funcs.check_zonefile, kwargs=dict(zonefile=zonefile)
+        remote.rdns.check_zonefile,
+        kwargs=dict(zonefile=zonefile, mail_domain=remote_data["mail_domain"]),
     )
 
+    returncode = 0
     if required_diff:
         out.red("Please set required DNS entries at your DNS provider:\n")
         for line in required_diff:
             out(line)
-        return 1
+        out("")
-    elif recommended_diff:
+        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"
+        )
+        out(remote_data.get("web_dkim_entry") + "\n")
+    if recommended_diff:
         out("WARNING: these recommended DNS entries are not set:\n")
         for line in recommended_diff:
             out(line)
-        return 0
 
-    out.green("Great! All your DNS entries are verified and correct.")
+    if not (recommended_diff or required_diff):
-    return 0
+        out.green("Great! All your DNS entries are verified and correct.")
+    return returncode

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

@@ -51,10 +51,7 @@ mail_server_comment = Chatmail server
 # <https://doc.dovecot.org/configuration_manual/quota_plugin/>
 mail_plugins = zlib quota
 
-# these are the capabilities Delta Chat cares about actually 
+imap_capability = +XDELTAPUSH XCHATMAIL
-# so let's keep the network overhead per login small
-# https://github.com/deltachat/deltachat-core-rust/blob/master/src/imap/capabilities.rs
-imap_capability = IMAP4rev1 IDLE MOVE QUOTA CONDSTORE NOTIFY METADATA XDELTAPUSH XCHATMAIL
 
 
 # Authentication for system users.
@@ -144,7 +141,7 @@ 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=30M
+  quota_max_mail_size={{ config.max_message_size }}
   quota_grace = 0
   # quota_over_flag_value = TRUE
 }
@@ -180,28 +177,53 @@ service auth-worker {
 }
 
 service imap-login {
-    # High-security mode.
+    # High-performance mode as described in
-    # Each process serves a single connection and exits afterwards.
+    # <https://doc.dovecot.org/2.3/admin_manual/login_processes/#high-performance-mode>
-    # This is the default, but we set it explicitly to be sure.
-    # See <https://doc.dovecot.org/admin_manual/login_processes/#high-security-mode> for details.
-    service_count = 1
-
-    # Inrease the number of simultaneous connections.
     #
-    # As of Dovecot 2.3.19.1 the default is 100 processes.
+    # So-called high-security mode described in
-    # Combined with `service_count = 1` it means only 100 connections
+    # <https://doc.dovecot.org/2.3/admin_manual/login_processes/#high-security-mode>
-    # can be handled simultaneously.
+    # and enabled by default with `service_count = 1` starts one process per connection
-    process_limit = 10000
+    # and has problems logging in thousands of users after Dovecot restart.
+    service_count = 0
+
+    # Increase virtual memory size limit.
+    # Since imap-login processes handle TLS connections
+    # even after logging users in
+    # and many connections are handled by each process,
+    # memory size limit should be increased.
+    #
+    # Otherwise the whole process eventually dies
+    # with an error similar to
+    #   imap-login: Fatal: master: service(imap-login):
+    #   child 1422951 returned error 83
+    #   (Out of memory (service imap-login { vsz_limit=256 MB },
+    #    you may need to increase it)
+    # and takes down all its TLS connections at once.
+    vsz_limit = 1G
 
     # Avoid startup latency for new connections.
+    #
+    # Should be set to at least the number of CPU cores
+    # according to the documentation.
     process_min_avail = 10
 }
 
+service anvil {
+    # We are disabling anvil penalty on failed login attempts
+    # because it can only detect brute forcing by IP address
+    # not by username. As the correct IP address is not handed
+    # to dovecot anyway, it is more of hindrance than of use.
+    # See <https://www.dovecot.org/list/dovecot/2012-May/135485.html> for details.
+    unix_listener anvil-auth-penalty {
+        mode = 0
+    }
+}
+
 ssl = required
 ssl_cert = </var/lib/acme/live/{{ config.mail_domain }}/fullchain
 ssl_key = </var/lib/acme/live/{{ config.mail_domain }}/privkey
 ssl_dh = </usr/share/dovecot/dh.pem
-ssl_min_protocol = TLSv1.2
+ssl_min_protocol = TLSv1.3
 ssl_prefer_server_ciphers = yes
 
 

cmdeploy/src/cmdeploy/dovecot/expunge.cron.j2

@@ -1,3 +1,5 @@
+# delete already seen big mails after 7 days, in the INBOX
+2 0 * * * vmail find {{ config.mailboxes_dir }} -path '*/cur/*' -mtime +{{ config.delete_large_after }} -size +200k -type f -delete
 # delete all mails after {{ config.delete_mails_after }} days, in the Inbox
 2 0 * * * vmail find {{ config.mailboxes_dir }} -path '*/cur/*' -mtime +{{ config.delete_mails_after }} -type f -delete
 # or in any IMAP subfolder

cmdeploy/src/cmdeploy/dovecot/push_notification.lua

@@ -2,15 +2,6 @@ function dovecot_lua_notify_begin_txn(user)
   return user
 end
 
-function contains(v, needle)
-  for _, keyword in ipairs(v) do
-    if keyword == needle then
-      return true
-    end
-  end
-  return false
-end
-
 function dovecot_lua_notify_event_message_new(user, event)
   local mbox = user:mailbox(event.mailbox)
   mbox:sync()

cmdeploy/src/cmdeploy/iroh-relay.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Iroh relay
+
+[Service]
+ExecStart=/usr/local/bin/iroh-relay --config-path /etc/iroh-relay.toml
+Restart=on-failure
+RestartSec=5s
+User=iroh
+Group=iroh
+
+[Install]
+WantedBy=multi-user.target

cmdeploy/src/cmdeploy/iroh-relay.toml

@@ -0,0 +1,5 @@
+enable_relay = true
+http_bind_addr = "[::]:3340"
+enable_stun = true
+enable_metrics = false
+metrics_bind_addr = "127.0.0.1:9092"

cmdeploy/src/cmdeploy/mtail/delivered_mail.mtail

@@ -0,0 +1,64 @@
+counter delivered_mail
+/saved mail to INBOX$/ {
+  delivered_mail++
+}
+
+counter quota_exceeded
+/Quota exceeded \(mailbox for user is full\)$/ {
+  quota_exceeded++
+}
+
+# Essentially the number of outgoing messages.
+counter dkim_signed
+/DKIM-Signature field added/ {
+  dkim_signed++
+}
+
+counter created_accounts
+counter created_ci_accounts
+counter created_nonci_accounts
+
+/: Created address: (?P<addr>.*)$/ {
+  created_accounts++
+
+  $addr =~ /ci-/ {
+    created_ci_accounts++
+  } else {
+    created_nonci_accounts++
+  }
+}
+
+counter postfix_timeouts
+/timeout after DATA/ {
+  postfix_timeouts++
+}
+
+counter postfix_noqueue
+/postfix\/.*NOQUEUE/ {
+  postfix_noqueue++
+}
+
+counter warning_count
+/warning/ {
+  warning_count++
+}
+
+
+counter filtered_mail_count
+
+counter encrypted_mail_count
+/Filtering encrypted mail\./ {
+  encrypted_mail_count++
+  filtered_mail_count++
+}
+
+counter unencrypted_mail_count
+/Filtering unencrypted mail\./ {
+  unencrypted_mail_count++
+  filtered_mail_count++
+}
+
+counter rejected_unencrypted_mail_count
+/Rejected unencrypted mail\./ {
+  rejected_unencrypted_mail_count++
+}

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

@@ -0,0 +1,10 @@
+[Unit]
+Description=mtail
+
+[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
+
+[Install]
+WantedBy=multi-user.target

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

@@ -2,11 +2,25 @@ load_module modules/ngx_stream_module.so;
 
 user www-data;
 worker_processes auto;
+
+# Increase the number of connections
+# that a worker process can open
+# to avoid errors such as
+#   accept4() failed (24: Too many open files)
+# and
+#   socket() failed (24: Too many open files) while connecting to upstream
+# in the logs.
+# <https://nginx.org/en/docs/ngx_core_module.html#worker_rlimit_nofile>
+worker_rlimit_nofile 2048;
 pid /run/nginx.pid;
 error_log syslog:server=unix:/dev/log,facility=local3;
 
 events {
-	worker_connections 768;
+        # Increase to avoid errors such as
+        #   768 worker_connections are not enough while connecting to upstream
+        # in the logs.
+        # <https://nginx.org/en/docs/ngx_core_module.html#worker_connections>
+	worker_connections 2048;
 	# multi_accept on;
 }
 
@@ -19,7 +33,9 @@ stream {
 
         server {
                 listen 443;
+                {% if not disable_ipv6 %}
                 listen [::]:443;
+                {% endif %}
                 proxy_pass $proxy;
                 ssl_preread on;
         }
@@ -44,10 +60,7 @@ http {
 
 	server {
   
-		listen 8443 ssl default_server;
+		listen 127.0.0.1:8443 ssl default_server;
-		{% if not disable_ipv6 %}
-		listen [::]:8443 ssl default_server;
-		{% endif %}
 
 		root /var/www/html;
 
@@ -94,14 +107,31 @@ http {
 			include /etc/nginx/fastcgi_params;
 			fastcgi_param SCRIPT_FILENAME /usr/lib/cgi-bin/newemail.py;
 		}
+
+                # Proxy to iroh-relay service.
+                location /relay {
+                        proxy_pass http://127.0.0.1:3340;
+                        proxy_http_version 1.1;
+
+                        # Upgrade header is normally set to "iroh derp http" or "websocket".
+                        proxy_set_header Upgrade $http_upgrade;
+                        proxy_set_header Connection "upgrade";
+                }
+
+		location /relay/probe {
+                        proxy_pass http://127.0.0.1:3340;
+                        proxy_http_version 1.1;
+		}
+
+		location /generate_204 {
+                        proxy_pass http://127.0.0.1:3340;
+                        proxy_http_version 1.1;
+		}
 	}
 
 	# Redirect www. to non-www
 	server {
-		listen 8443 ssl;
+		listen 127.0.0.1:8443 ssl;
-		{% if not disable_ipv6 %}
-		listen [::]:8443 ssl;
-		{% endif %}
 		server_name www.{{ config.domain_name }};
 		return 301 $scheme://{{ config.domain_name }}$request_uri;
 		access_log syslog:server=unix:/dev/log,facility=local7;

cmdeploy/src/cmdeploy/opendkim/systemd.conf

@@ -0,0 +1,3 @@
+[Service]
+Restart=always
+RuntimeMaxSec=1d

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

@@ -20,9 +20,12 @@ smtpd_tls_key_file=/var/lib/acme/live/{{ config.mail_domain }}/privkey
 smtpd_tls_security_level=may
 
 smtp_tls_CApath=/etc/ssl/certs
-smtp_tls_security_level=may
+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
 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
-smtp_tls_policy_maps = socketmap:inet:127.0.0.1:8461:postfix
+smtp_tls_policy_maps = inline:{nauta.cu=may}
 smtpd_tls_protocols = >=TLSv1.2
 
 # Disable anonymous cipher suites

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

@@ -14,10 +14,11 @@ smtp      inet  n       -       y       -       -       smtpd -v
 {%- else %}
 smtp      inet  n       -       y       -       -       smtpd 
 {%- endif %}
-  -o smtpd_milters=unix:opendkim/opendkim.sock
+  -o smtpd_proxy_filter=127.0.0.1:{{ config.filtermail_smtp_port_incoming }}
 submission inet n       -       y       -       5000    smtpd
   -o syslog_name=postfix/submission
   -o smtpd_tls_security_level=encrypt
+  -o smtpd_tls_mandatory_protocols=>=TLSv1.3
   -o smtpd_sasl_auth_enable=yes
   -o smtpd_sasl_type=dovecot
   -o smtpd_sasl_path=private/auth
@@ -31,11 +32,11 @@ submission inet n       -       y       -       5000    smtpd
   -o milter_macro_daemon_name=ORIGINATING
   -o smtpd_client_connection_count_limit=1000
   -o smtpd_proxy_filter=127.0.0.1:{{ config.filtermail_smtp_port }}
-  -o cleanup_service_name=authclean
 smtps     inet  n       -       y       -       5000    smtpd
   -o syslog_name=postfix/smtps
   -o smtpd_tls_wrappermode=yes
   -o smtpd_tls_security_level=encrypt
+  -o smtpd_tls_mandatory_protocols=>=TLSv1.3
   -o smtpd_sasl_auth_enable=yes
   -o smtpd_sasl_type=dovecot
   -o smtpd_sasl_path=private/auth
@@ -48,7 +49,6 @@ smtps     inet  n       -       y       -       5000    smtpd
   -o smtpd_client_connection_count_limit=1000
   -o milter_macro_daemon_name=ORIGINATING
   -o smtpd_proxy_filter=127.0.0.1:{{ config.filtermail_smtp_port }}
-  -o cleanup_service_name=authclean
 #628       inet  n       -       y       -       -       qmqpd
 pickup    unix  n       -       y       60      1       pickup
 cleanup   unix  n       -       y       -       0       cleanup
@@ -76,17 +76,27 @@ 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 filered mail.
+# Local SMTP server for reinjecting outgoing filtered mail.
-localhost:{{ config.postfix_reinject_port }} inet  n       -       n       -       10      smtpd
+127.0.0.1:{{ config.postfix_reinject_port }} inet  n       -       n       -       10      smtpd
   -o syslog_name=postfix/reinject
   -o smtpd_milters=unix:opendkim/opendkim.sock
   -o cleanup_service_name=authclean
 
+# Local SMTP server for reinjecting incoming filtered mail 
+127.0.0.1:{{ config.postfix_reinject_port_incoming }} inet  n       -       n       -       10      smtpd
+  -o syslog_name=postfix/reinject_incoming
+  -o smtpd_milters=unix:opendkim/opendkim.sock
+
 # Cleanup `Received` headers for authenticated mail
 # to avoid leaking client IP.
 #
 # We do not do this for received mails
 # as this will break DKIM signatures
 # if `Received` header is signed.
+#
+# This service also rewrites
+# Subject with `[...]`
+# to make sure the users
+# cannot send unprotected Subject.
 authclean unix  n       -       -       -       0       cleanup
   -o header_checks=regexp:/etc/postfix/submission_header_cleanup

cmdeploy/src/cmdeploy/postfix/submission_header_cleanup

@@ -2,3 +2,4 @@
 /^X-Originating-IP:/    IGNORE
 /^X-Mailer:/            IGNORE
 /^User-Agent:/          IGNORE
+/^Subject:/             REPLACE Subject: [...]

cmdeploy/src/cmdeploy/remote/__init__.py

@@ -0,0 +1,12 @@
+"""
+
+The 'cmdeploy.remote' sub package contains modules with remotely executing functions.
+
+Its "_sshexec_bootstrap" module is executed remotely through `SSHExec`
+and its main() loop there stays connected via a command channel,
+ready to receive function invocations ("command") and return results.
+"""
+
+from . import rdns, rshell
+
+__all__ = ["rdns", "rshell"]

cmdeploy/src/cmdeploy/remote/_sshexec_bootstrap.py

@@ -0,0 +1,30 @@
+import builtins
+import importlib
+import traceback
+
+## Function Execution server
+
+
+def _run_loop(cmd_channel):
+    while cmd := cmd_channel.receive():
+        cmd_channel.send(_handle_one_request(cmd))
+
+
+def _handle_one_request(cmd):
+    pymod_path, func_name, kwargs = cmd
+    try:
+        mod = importlib.import_module(pymod_path)
+        func = getattr(mod, func_name)
+        res = func(**kwargs)
+        return ("finish", res)
+    except:
+        data = traceback.format_exc()
+        return ("error", data)
+
+
+def main(channel):
+    # enable simple "print" logging
+
+    builtins.print = lambda x="": channel.send(("log", x))
+
+    _run_loop(channel)

cmdeploy/src/cmdeploy/remote/rdns.py

@@ -11,41 +11,28 @@ All functions of this module
 """
 
 import re
-import traceback
-from subprocess import CalledProcessError, check_output
 
-
+from .rshell import CalledProcessError, shell
-def shell(command, fail_ok=False):
-    print(f"$ {command}")
-    try:
-        return check_output(command, shell=True).decode().rstrip()
-    except CalledProcessError:
-        if not fail_ok:
-            raise
-        return ""
-
-
-def get_systemd_running():
-    lines = shell("systemctl --type=service --state=running").split("\n")
-    return [line for line in lines if line.startswith("  ")]
 
 
 def perform_initial_checks(mail_domain):
     """Collecting initial DNS settings."""
     assert mail_domain
+    if not shell("dig", fail_ok=True):
+        shell("apt-get update && apt-get install -y dnsutils")
     A = query_dns("A", mail_domain)
     AAAA = query_dns("AAAA", mail_domain)
     MTA_STS = query_dns("CNAME", f"mta-sts.{mail_domain}")
+    WWW = query_dns("CNAME", f"www.{mail_domain}")
 
-    res = dict(mail_domain=mail_domain, A=A, AAAA=AAAA, MTA_STS=MTA_STS)
+    res = dict(mail_domain=mail_domain, A=A, AAAA=AAAA, MTA_STS=MTA_STS, WWW=WWW)
-    if not MTA_STS or (not A and not AAAA):
-        return res
-
     res["acme_account_url"] = shell("acmetool account-url", fail_ok=True)
-    if not shell("dig", fail_ok=True):
+    res["dkim_entry"], res["web_dkim_entry"] = get_dkim_entry(
-        shell("apt-get install -y dnsutils")
+        mail_domain, dkim_selector="opendkim"
-    shell(f"unbound-control flush_zone {mail_domain}", fail_ok=True)
+    )
-    res["dkim_entry"] = get_dkim_entry(mail_domain, dkim_selector="opendkim")
+
+    if not MTA_STS or not WWW or (not A and not AAAA):
+        return res
 
     # parse out sts-id if exists, example: "v=STSv1; id=2090123"
     parts = query_dns("TXT", f"_mta-sts.{mail_domain}").split("id=")
@@ -63,18 +50,34 @@ def get_dkim_entry(mail_domain, dkim_selector):
         return
     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))
-    return f'{dkim_selector}._domainkey.{mail_domain}. TXT "{dkim_value}"'
+    web_dkim_value = "".join(re.findall(".{1,255}", dkim_value_raw))
+    return (
+        f'{dkim_selector}._domainkey.{mail_domain}. TXT "{dkim_value}"',
+        f'{dkim_selector}._domainkey.{mail_domain}. TXT "{web_dkim_value}"',
+    )
 
 
 def query_dns(typ, domain):
-    res = shell(f"dig -r -q {domain} -t {typ} +short")
+    # Get autoritative nameserver from the SOA record.
-    print(res)
+    soa_answers = [
+        x.split()
+        for x in shell(f"dig -r -q {domain} -t SOA +noall +authority +answer").split(
+            "\n"
+        )
+    ]
+    soa = [a for a in soa_answers if len(a) >= 3 and a[3] == "SOA"]
+    if not soa:
+        return
+    ns = soa[0][4]
+
+    # Query authoritative nameserver directly to bypass DNS cache.
+    res = shell(f"dig @{ns} -r -q {domain} -t {typ} +short")
     if res:
         return res.split("\n")[0]
     return ""
 
 
-def check_zonefile(zonefile):
+def check_zonefile(zonefile, mail_domain):
     """Check expected zone file entries."""
     required = True
     required_diff = []
@@ -99,37 +102,3 @@ def check_zonefile(zonefile):
                 recommended_diff.append(zf_line)
 
     return required_diff, recommended_diff
-
-
-## Function Execution server
-
-
-def _run_loop(cmd_channel):
-    while 1:
-        cmd = cmd_channel.receive()
-        if cmd is None:
-            break
-
-        cmd_channel.send(_handle_one_request(cmd))
-
-
-def _handle_one_request(cmd):
-    func_name, kwargs = cmd
-    try:
-        res = globals()[func_name](**kwargs)
-        return ("finish", res)
-    except:
-        data = traceback.format_exc()
-        return ("error", data)
-
-
-# check if this module is executed remotely
-# and setup a simple serialized function-execution loop
-
-if __name__ == "__channelexec__":
-    channel = channel  # noqa (channel object gets injected)
-
-    # enable simple "print" logging for anyone changing this module
-    globals()["print"] = lambda x="": channel.send(("log", x))
-
-    _run_loop(channel)

cmdeploy/src/cmdeploy/remote/rshell.py

@@ -0,0 +1,38 @@
+from subprocess import DEVNULL, CalledProcessError, check_output
+
+
+def shell(command, fail_ok=False):
+    print(f"$ {command}")
+    args = dict(shell=True)
+    if fail_ok:
+        args["stderr"] = DEVNULL
+    try:
+        return check_output(command, **args).decode().rstrip()
+    except CalledProcessError:
+        if not fail_ok:
+            raise
+        return ""
+
+
+def get_systemd_running():
+    lines = shell("systemctl --type=service --state=running").split("\n")
+    return [line for line in lines if line.startswith("  ")]
+
+
+def write_numbytes(path, num):
+    with open(path, "w") as f:
+        f.write("x" * num)
+
+
+def dovecot_recalc_quota(user):
+    shell(f"doveadm quota recalc -u {user}")
+    output = shell(f"doveadm quota get -u {user}")
+    #
+    # Quota name Type    Value  Limit                                              %
+    # User quota STORAGE     5 102400                                              0
+    # User quota MESSAGE     2      -                                              0
+    #
+    for line in output.split("\n"):
+        parts = line.split()
+        if parts[2] == "STORAGE":
+            return dict(value=int(parts[3]), limit=int(parts[4]), percent=int(parts[5]))

cmdeploy/src/cmdeploy/service/chatmail-metadata.service.f

@@ -7,6 +7,7 @@ Restart=always
 RestartSec=30
 User=vmail
 RuntimeDirectory=chatmail-metadata
+UMask=0077
 
 [Install]
 WantedBy=multi-user.target

cmdeploy/src/cmdeploy/service/doveauth.service.f

@@ -7,6 +7,7 @@ Restart=always
 RestartSec=30
 User=vmail
 RuntimeDirectory=doveauth
+UMask=0077
 
 [Install]
 WantedBy=multi-user.target

cmdeploy/src/cmdeploy/service/filtermail-incoming.service.f

@@ -0,0 +1,12 @@
+[Unit]
+Description=Incoming Chatmail Postfix before queue filter 
+
+[Service]
+ExecStart={execpath} {config_path} incoming
+Restart=always
+RestartSec=30
+User=vmail
+
+[Install]
+WantedBy=multi-user.target
+

cmdeploy/src/cmdeploy/service/filtermail.service.f

@@ -1,11 +1,11 @@
 [Unit]
-Description=Chatmail Postfix before queue filter
+Description=Outgoing Chatmail Postfix before queue filter
 
 [Service]
-ExecStart={execpath} {config_path}
+ExecStart={execpath} {config_path} outgoing
 Restart=always
 RestartSec=30
-User=filtermail
+User=vmail
 
 [Install]
 WantedBy=multi-user.target

cmdeploy/src/cmdeploy/sshexec.py

@@ -1,12 +1,45 @@
+import inspect
+import os
 import sys
+from queue import Queue
 
 import execnet
 
+from . import remote
+
 
 class FuncError(Exception):
     pass
 
 
+def bootstrap_remote(gateway, remote=remote):
+    """Return a command channel which can execute remote functions."""
+    source_init_path = inspect.getfile(remote)
+    basedir = os.path.dirname(source_init_path)
+    name = os.path.basename(basedir)
+
+    # rsync sourcedir to remote host
+    remote_pkg_path = f"/root/from-cmdeploy/{name}"
+    q = Queue()
+    finish = lambda: q.put(None)
+    rsync = execnet.RSync(sourcedir=basedir, verbose=False)
+    rsync.add_target(gateway, remote_pkg_path, finishedcallback=finish, delete=True)
+    rsync.send()
+    q.get()
+
+    # start sshexec bootstrap and return its command channel
+    remote_sys_path = os.path.dirname(remote_pkg_path)
+    channel = gateway.remote_exec(
+        f"""
+        import sys
+        sys.path.insert(0, {remote_sys_path!r})
+        from remote._sshexec_bootstrap import main
+        main(channel)
+    """
+    )
+    return channel
+
+
 def print_stderr(item="", end="\n"):
     print(item, file=sys.stderr, end=end)
 
@@ -15,16 +48,18 @@ class SSHExec:
     RemoteError = execnet.RemoteError
     FuncError = FuncError
 
-    def __init__(self, host, remote_funcs, verbose=False, python="python3", timeout=60):
+    def __init__(self, host, verbose=False, python="python3", timeout=60):
         self.gateway = execnet.makegateway(f"ssh=root@{host}//python={python}")
-        self._remote_cmdloop_channel = self.gateway.remote_exec(remote_funcs)
+        self._remote_cmdloop_channel = bootstrap_remote(self.gateway, remote)
         self.timeout = timeout
         self.verbose = verbose
 
     def __call__(self, call, kwargs=None, log_callback=None):
         if kwargs is None:
             kwargs = {}
-        self._remote_cmdloop_channel.send((call.__name__, kwargs))
+        assert call.__module__.startswith("cmdeploy.remote")
+        modname = call.__module__.replace("cmdeploy.", "")
+        self._remote_cmdloop_channel.send((modname, call.__name__, kwargs))
         while 1:
             code, data = self._remote_cmdloop_channel.receive(timeout=self.timeout)
             if log_callback is not None and code == "log":

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

@@ -11,7 +11,7 @@ _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 128 issue "letsencrypt.org;accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/1371472956"
+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"

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

@@ -37,7 +37,7 @@ class TestDC:
 
     def test_ping_pong(self, benchmark, cmfactory):
         ac1, ac2 = cmfactory.get_online_accounts(2)
-        chat = cmfactory.get_accepted_chat(ac1, ac2)
+        chat = cmfactory.get_protected_chat(ac1, ac2)
 
         def dc_ping_pong():
             chat.send_text("ping")
@@ -49,7 +49,7 @@ class TestDC:
 
     def test_send_10_receive_10(self, benchmark, cmfactory, lp):
         ac1, ac2 = cmfactory.get_online_accounts(2)
-        chat = cmfactory.get_accepted_chat(ac1, ac2)
+        chat = cmfactory.get_protected_chat(ac1, ac2)
 
         def dc_send_10_receive_10():
             for i in range(10):

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

@@ -90,8 +90,13 @@ def test_concurrent_logins_same_account(
 
 
 def test_no_vrfy(chatmail_config):
+    domain = chatmail_config.mail_domain
     sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-    sock.connect((chatmail_config.mail_domain, 25))
+    sock.settimeout(10)
+    try:
+        sock.connect((domain, 25))
+    except socket.timeout:
+        pytest.skip(f"port 25 not reachable for {domain}")
     banner = sock.recv(1024)
     print(banner)
     sock.send(b"VRFY wrongaddress@%s\r\n" % (chatmail_config.mail_domain.encode(),))

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

@@ -1,30 +1,33 @@
+import datetime
 import smtplib
+import socket
+import subprocess
 
 import pytest
 
-from cmdeploy import remote_funcs
+from cmdeploy import remote
 from cmdeploy.sshexec import SSHExec
 
 
 class TestSSHExecutor:
     @pytest.fixture(scope="class")
     def sshexec(self, sshdomain):
-        return SSHExec(sshdomain, remote_funcs)
+        return SSHExec(sshdomain)
 
     def test_ls(self, sshexec):
-        out = sshexec(call=remote_funcs.shell, kwargs=dict(command="ls"))
+        out = sshexec(call=remote.rdns.shell, kwargs=dict(command="ls"))
-        out2 = sshexec(call=remote_funcs.shell, kwargs=dict(command="ls"))
+        out2 = sshexec(call=remote.rdns.shell, kwargs=dict(command="ls"))
         assert out == out2
 
     def test_perform_initial(self, sshexec, maildomain):
         res = sshexec(
-            remote_funcs.perform_initial_checks, kwargs=dict(mail_domain=maildomain)
+            remote.rdns.perform_initial_checks, kwargs=dict(mail_domain=maildomain)
         )
         assert res["A"] or res["AAAA"]
 
     def test_logged(self, sshexec, maildomain, capsys):
         sshexec.logged(
-            remote_funcs.perform_initial_checks, kwargs=dict(mail_domain=maildomain)
+            remote.rdns.perform_initial_checks, kwargs=dict(mail_domain=maildomain)
         )
         out, err = capsys.readouterr()
         assert err.startswith("Collecting")
@@ -33,25 +36,42 @@ class TestSSHExecutor:
 
         sshexec.verbose = True
         sshexec.logged(
-            remote_funcs.perform_initial_checks, kwargs=dict(mail_domain=maildomain)
+            remote.rdns.perform_initial_checks, kwargs=dict(mail_domain=maildomain)
         )
         out, err = capsys.readouterr()
         lines = err.split("\n")
         assert len(lines) > 4
-        assert remote_funcs.perform_initial_checks.__doc__ in lines[0]
+        assert remote.rdns.perform_initial_checks.__doc__ in lines[0]
 
     def test_exception(self, sshexec, capsys):
         try:
             sshexec.logged(
-                remote_funcs.perform_initial_checks,
+                remote.rdns.perform_initial_checks,
                 kwargs=dict(mail_domain=None),
             )
         except sshexec.FuncError as e:
-            assert "remote_funcs.py" in str(e)
+            assert "rdns.py" in str(e)
             assert "AssertionError" in str(e)
         else:
             pytest.fail("didn't raise exception")
 
+    def test_opendkim_restarted(self, sshexec):
+        """check that opendkim is not running for longer than a day."""
+        cmd = "systemctl show opendkim --timestamp=utc --property=ActiveEnterTimestamp"
+        out = sshexec(call=remote.rshell.shell, kwargs=dict(command=cmd))
+        datestring = out.split("=")[1]
+        since_date = datetime.datetime.strptime(datestring, "%a %Y-%m-%d %H:%M:%S %Z")
+        now = datetime.datetime.now(since_date.tzinfo)
+        assert (now - since_date).total_seconds() < 60 * 60 * 51
+
+
+def test_timezone_env(remote):
+    for line in remote.iter_output("env"):
+        print(line)
+        if line == "tz=:/etc/localtime":
+            return True
+    pytest.fail("TZ is not set")
+
 
 def test_remote(remote, imap_or_smtp):
     lineproducer = remote.iter_output(imap_or_smtp.logcmd)
@@ -107,14 +127,46 @@ def test_authenticated_from(cmsetup, maildata):
 
 @pytest.mark.parametrize("from_addr", ["fake@example.org", "fake@testrun.org"])
 def test_reject_missing_dkim(cmsetup, maildata, from_addr):
-    """Test that emails with missing or wrong DMARC, DKIM, and SPF entries are rejected."""
+    domain = cmsetup.maildomain
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.settimeout(10)
+    try:
+        sock.connect((domain, 25))
+    except socket.timeout:
+        pytest.skip(f"port 25 not reachable for {domain}")
+
     recipient = cmsetup.gen_users(1)[0]
-    msg = maildata("plain.eml", from_addr=from_addr, to_addr=recipient.addr).as_string()
+    msg = maildata(
-    with smtplib.SMTP(cmsetup.maildomain, 25) as s:
+        "encrypted.eml", from_addr=from_addr, to_addr=recipient.addr
+    ).as_string()
+    conn = smtplib.SMTP(cmsetup.maildomain, 25, timeout=10)
+
+    with conn as s:
         with pytest.raises(smtplib.SMTPDataError, match="No valid DKIM signature"):
             s.sendmail(from_addr=from_addr, to_addrs=recipient.addr, msg=msg)
 
 
+def test_rewrite_subject(cmsetup, maildata):
+    """Test that subject gets replaced with [...]."""
+    user1, user2 = cmsetup.gen_users(2)
+
+    sent_msg = maildata(
+        "encrypted.eml",
+        from_addr=user1.addr,
+        to_addr=user2.addr,
+        subject="Unencrypted subject",
+    ).as_string()
+    user1.smtp.sendmail(from_addr=user1.addr, to_addrs=[user2.addr], msg=sent_msg)
+
+    messages = user2.imap.fetch_all_messages()
+    assert len(messages) == 1
+    rcvd_msg = messages[0]
+    assert "Subject: [...]" not in sent_msg
+    assert "Subject: [...]" in rcvd_msg
+    assert "Subject: Unencrypted subject" in sent_msg
+    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."""
@@ -147,6 +199,25 @@ def test_expunged(remote, chatmail_config):
         f"find {chatmail_config.mailboxes_dir} -path '*/tmp/*' -mtime +{outdated_days} -type f",
         f"find {chatmail_config.mailboxes_dir} -path '*/.*/tmp/*' -mtime +{outdated_days} -type f",
     ]
+    outdated_days = int(chatmail_config.delete_large_after) + 1
+    find_cmds.append(
+        "find {chatmail_config.mailboxes_dir} -path '*/cur/*' -mtime +{outdated_days} -size +200k -type f"
+    )
     for cmd in find_cmds:
         for line in remote.iter_output(cmd):
             assert not line
+
+
+def test_deployed_state(remote):
+    git_hash = subprocess.check_output(["git", "rev-parse", "HEAD"]).decode()
+    git_diff = subprocess.check_output(["git", "diff"]).decode()
+    git_status = [git_hash.strip()]
+    for line in git_diff.splitlines():
+        git_status.append(line.strip().lower())
+    remote_version = []
+    for line in remote.iter_output("cat /etc/chatmail-version"):
+        print(line)
+        remote_version.append(line)
+    # 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."

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

@@ -1,5 +1,4 @@
 import ipaddress
-import random
 import re
 import time
 
@@ -7,6 +6,9 @@ import imap_tools
 import pytest
 import requests
 
+from cmdeploy.remote import rshell
+from cmdeploy.sshexec import SSHExec
+
 
 @pytest.fixture
 def imap_mailbox(cmfactory):
@@ -54,22 +56,23 @@ class TestEndToEndDeltaChat:
         """Test that a DC account can send a message to a second DC account
         on the same chat-mail instance."""
         ac1, ac2 = cmfactory.get_online_accounts(2)
-        chat = cmfactory.get_accepted_chat(ac1, ac2)
+        chat = cmfactory.get_protected_chat(ac1, ac2)
-
-        lp.sec("ac1: prepare and send text message to ac2")
         chat.send_text("message0")
 
         lp.sec("wait for ac2 to receive message")
         msg2 = ac2._evtracker.wait_next_incoming_message()
         assert msg2.text == "message0"
 
-    @pytest.mark.slow
+    def test_exceed_quota(
-    def test_exceed_quota(self, cmfactory, lp, tmpdir, remote, chatmail_config):
+        self, cmfactory, lp, tmpdir, remote, chatmail_config, sshdomain
+    ):
         """This is a very slow test as it needs to upload >100MB of mail data
         before quota is exceeded, and thus depends on the speed of the upload.
         """
         ac1, ac2 = cmfactory.get_online_accounts(2)
-        chat = cmfactory.get_accepted_chat(ac1, ac2)
+        chat = cmfactory.get_protected_chat(ac1, ac2)
+
+        user = ac2.get_config("configured_addr")
 
         def parse_size_limit(limit: str) -> int:
             """Parse a size limit and return the number of bytes as integer.
@@ -82,49 +85,27 @@ class TestEndToEndDeltaChat:
             return int(float(number) * units[unit])
 
         quota = parse_size_limit(chatmail_config.max_mailbox_size)
-        attachsize = 1 * 1024 * 1024
-        num_to_send = quota // attachsize + 2
-        lp.sec(f"ac1: send {num_to_send} large files to ac2")
-        lp.indent(f"per-user quota is assumed to be: {quota/(1024*1024)}MB")
-        alphanumeric = "abcdefghijklmnopqrstuvwxyz1234567890"
-        msgs = []
-        for i in range(num_to_send):
-            attachment = tmpdir / f"attachment{i}"
-            data = "".join(random.choice(alphanumeric) for i in range(1024))
-            with open(attachment, "w+") as f:
-                for j in range(attachsize // len(data)):
-                    f.write(data)
 
-            msg = chat.send_file(str(attachment))
+        lp.sec(f"filling remote inbox for {user}")
-            msgs.append(msg)
+        fn = f"7743102289.M843172P2484002.c20,S={quota},W=2398:2,"
-            lp.indent(f"Sent out msg {i}, size {attachsize/(1024*1024)}MB")
+        path = chatmail_config.mailboxes_dir.joinpath(user, "cur", fn)
+        sshexec = SSHExec(sshdomain)
+        sshexec(call=rshell.write_numbytes, kwargs=dict(path=str(path), num=120))
+        res = sshexec(call=rshell.dovecot_recalc_quota, kwargs=dict(user=user))
+        assert res["percent"] >= 100
 
-        lp.sec("ac2: check messages are arriving until quota is reached")
+        lp.sec("ac2: check quota is triggered")
 
-        addr = ac2.get_config("addr").lower()
+        starting = True
-        saved_ok = 0
         for line in remote.iter_output("journalctl -n0 -f -u dovecot"):
-            if addr not in line:
+            if starting:
+                chat.send_text("hello")
+                starting = False
+            if user not in line:
                 # print(line)
                 continue
-            if "quota" in line:
+            if "quota exceeded" in line:
-                if "quota exceeded" in line:
+                return
-                    if saved_ok < num_to_send // 2:
-                        pytest.fail(
-                            f"quota exceeded too early: after {saved_ok} messages already"
-                        )
-                    lp.indent("good, message sending failed because quota was exceeded")
-                    return
-            if (
-                "stored mail into mailbox 'inbox'" in line
-                or "saved mail to inbox" in line
-            ):
-                saved_ok += 1
-                print(f"{saved_ok}: {line}")
-                if saved_ok >= num_to_send:
-                    break
-
-        pytest.fail("sending succeeded although messages should exceed quota")
 
     def test_securejoin(self, cmfactory, lp, maildomain2):
         ac1 = cmfactory.new_online_configuring_account(cache=False)
@@ -172,7 +153,7 @@ def test_hide_senders_ip_address(cmfactory):
     assert ipaddress.ip_address(public_ip)
 
     user1, user2 = cmfactory.get_online_accounts(2)
-    chat = cmfactory.get_accepted_chat(user1, user2)
+    chat = cmfactory.get_protected_chat(user1, user2)
 
     chat.send_text("testing submission header cleanup")
     user2._evtracker.wait_next_incoming_message()
@@ -181,11 +162,18 @@ def test_hide_senders_ip_address(cmfactory):
     assert public_ip not in msg.obj.as_string()
 
 
-def test_echobot(cmfactory, chatmail_config, lp):
+def test_echobot(cmfactory, chatmail_config, lp, sshdomain):
     ac = cmfactory.get_online_accounts(1)[0]
 
-    lp.sec(f"Send message to echo@{chatmail_config.mail_domain}")
+    # establish contact with echobot
-    chat = ac.create_chat(f"echo@{chatmail_config.mail_domain}")
+    sshexec = SSHExec(sshdomain)
+    command = "cat /var/lib/echobot/invite-link.txt"
+    echo_invite_link = sshexec(call=rshell.shell, kwargs=dict(command=command))
+    chat = ac.qr_setup_contact(echo_invite_link)
+    ac._evtracker.wait_securejoin_joiner_progress(1000)
+
+    # send message and check it gets replied back
+    lp.sec("Send message to echobot")
     text = "hi, I hope you text me back"
     chat.send_text(text)
     lp.sec("Wait for reply from echobot")

cmdeploy/src/cmdeploy/tests/plugin.py

@@ -62,7 +62,7 @@ def sshdomain(maildomain):
 def maildomain2():
     domain = os.environ.get("CHATMAIL_DOMAIN2")
     if not domain:
-        pytest.skip("set CHATMAIL_DOMAIN2 to a ssh-reachable chatmail instance")
+        pytest.skip("set CHATMAIL_DOMAIN2 to a second chatmail server")
     return domain
 
 
@@ -302,10 +302,13 @@ def cmfactory(request, gencreds, tmpdir, maildomain):
     pytest.importorskip("deltachat")
     from deltachat.testplugin import ACFactory
 
-    data = request.getfixturevalue("data")
-
     testproc = ChatmailTestProcess(request.config, maildomain, gencreds)
-    am = ACFactory(request=request, tmpdir=tmpdir, testprocess=testproc, data=data)
+
+    class Data:
+        def read_path(self, path):
+            return
+
+    am = ACFactory(request=request, tmpdir=tmpdir, testprocess=testproc, data=Data())
 
     # nb. a bit hacky
     # would probably be better if deltachat's test machinery grows native support

cmdeploy/src/cmdeploy/tests/test_dns.py

@@ -1,6 +1,6 @@
 import pytest
 
-from cmdeploy import remote_funcs
+from cmdeploy import remote
 from cmdeploy.dns import check_full_zone, check_initial_remote_data
 
 
@@ -14,7 +14,7 @@ def mockdns_base(monkeypatch):
         except KeyError:
             return ""
 
-    monkeypatch.setattr(remote_funcs, query_dns.__name__, query_dns)
+    monkeypatch.setattr(remote.rdns, query_dns.__name__, query_dns)
     return qdict
 
 
@@ -24,7 +24,10 @@ def mockdns(mockdns_base):
         {
             "A": {"some.domain": "1.1.1.1"},
             "AAAA": {"some.domain": "fde5:cd7a:9e1c:3240:5a99:936f:cdac:53ae"},
-            "CNAME": {"mta-sts.some.domain": "some.domain"},
+            "CNAME": {
+                "mta-sts.some.domain": "some.domain.",
+                "www.some.domain": "some.domain.",
+            },
         }
     )
     return mockdns_base
@@ -32,14 +35,16 @@ def mockdns(mockdns_base):
 
 class TestPerformInitialChecks:
     def test_perform_initial_checks_ok1(self, mockdns):
-        remote_data = remote_funcs.perform_initial_checks("some.domain")
+        remote_data = remote.rdns.perform_initial_checks("some.domain")
-        assert len(remote_data) == 7
+        assert remote_data["A"] == mockdns["A"]["some.domain"]
+        assert remote_data["AAAA"] == mockdns["AAAA"]["some.domain"]
+        assert remote_data["MTA_STS"] == mockdns["CNAME"]["mta-sts.some.domain"]
+        assert remote_data["WWW"] == mockdns["CNAME"]["www.some.domain"]
 
     @pytest.mark.parametrize("drop", ["A", "AAAA"])
     def test_perform_initial_checks_with_one_of_A_AAAA(self, mockdns, drop):
         del mockdns[drop]
-        remote_data = remote_funcs.perform_initial_checks("some.domain")
+        remote_data = remote.rdns.perform_initial_checks("some.domain")
-        assert len(remote_data) == 7
         assert not remote_data[drop]
 
         l = []
@@ -48,9 +53,8 @@ class TestPerformInitialChecks:
         assert not l
 
     def test_perform_initial_checks_no_mta_sts(self, mockdns):
-        del mockdns["CNAME"]
+        del mockdns["CNAME"]["mta-sts.some.domain"]
-        remote_data = remote_funcs.perform_initial_checks("some.domain")
+        remote_data = remote.rdns.perform_initial_checks("some.domain")
-        assert len(remote_data) == 4
         assert not remote_data["MTA_STS"]
 
         l = []
@@ -85,14 +89,18 @@ class TestZonefileChecks:
     def test_check_zonefile_all_ok(self, cm_data, mockdns_base):
         zonefile = cm_data.get("zftest.zone")
         parse_zonefile_into_dict(zonefile, mockdns_base)
-        required_diff, recommended_diff = remote_funcs.check_zonefile(zonefile)
+        required_diff, recommended_diff = remote.rdns.check_zonefile(
+            zonefile, "some.domain"
+        )
         assert not required_diff and not recommended_diff
 
     def test_check_zonefile_recommended_not_set(self, cm_data, mockdns_base):
         zonefile = cm_data.get("zftest.zone")
         zonefile_mocked = zonefile.split("; Recommended")[0]
         parse_zonefile_into_dict(zonefile_mocked, mockdns_base)
-        required_diff, recommended_diff = remote_funcs.check_zonefile(zonefile)
+        required_diff, recommended_diff = remote.rdns.check_zonefile(
+            zonefile, "some.domain"
+        )
         assert not required_diff
         assert len(recommended_diff) == 8
 
@@ -101,6 +109,7 @@ class TestZonefileChecks:
         zonefile_mocked = zonefile.split("; Recommended")[0]
         parse_zonefile_into_dict(zonefile_mocked, mockdns_base, only_required=True)
         mssh = MockSSHExec()
+        mockdns_base["mail_domain"] = "some.domain"
         res = check_full_zone(mssh, mockdns_base, out=mockout, zonefile=zonefile)
         assert res == 0
         assert "WARNING" in mockout.captured_plain[0]
@@ -110,6 +119,7 @@ class TestZonefileChecks:
         zonefile = cm_data.get("zftest.zone")
         parse_zonefile_into_dict(zonefile, mockdns_base)
         mssh = MockSSHExec()
+        mockdns_base["mail_domain"] = "some.domain"
         res = check_full_zone(mssh, mockdns_base, out=mockout, zonefile=zonefile)
         assert res == 0
         assert not mockout.captured_red

scripts/initenv.sh

@@ -1,5 +1,18 @@
 #!/bin/sh
 set -e
+
+if command -v lsb_release 2>&1 >/dev/null; then
+  case "$(lsb_release -is)" in
+    Ubuntu | Debian )
+      if ! dpkg -l | grep python3-dev 2>&1 >/dev/null
+      then
+        echo "You need to install python3-dev for installing the other dependencies."
+        exit 1
+      fi
+      ;;
+  esac
+fi
+
 python3 -m venv --upgrade-deps venv
 
 venv/bin/pip install -e chatmaild 

www/src/info.md

@@ -6,29 +6,6 @@ interoperable e-mail service for everyone. What's behind a `chatmail` is
 effectively a normal e-mail address just like any other but optimized 
 for the usage in chats, especially DeltaChat.
 
-### Choosing a chatmail address instead of using a random one
-
-In the Delta Chat account setup you may tap `Create a profile` then `Use other server` and choose `Classic e-mail login`. Here fill the two fields like this: 
-
-- `E-Mail Address`: invent a word with
-{% if username_min_length == username_max_length %}
-  *exactly* {{ username_min_length }}
-{% else %}
-  {{ username_min_length}}
-  {% if username_max_length == "more" %}
-    or more
-  {% else %}
-    to {{ username_max_length }}
-  {% endif %}
-{% endif %}
-  characters
-  and append `@{{config.mail_domain}}` to it.
-
-- `Existing Password`: invent at least {{ password_min_length }} characters.
-
-If the e-mail address is not yet taken, you'll get that account. 
-The first login sets your password. 
-
 
 ### Rate and storage limits 
 
@@ -38,10 +15,25 @@ The first login sets your password.
 
 - You may send up to {{ config.max_user_send_per_minute }} messages per minute.
 
-- Messages are unconditionally removed {{ config.delete_mails_after }} days after arriving on the server.
-
 - You can store up to [{{ config.max_mailbox_size }} messages on the server](https://delta.chat/en/help#what-happens-if-i-turn-on-delete-old-messages-from-server).
 
+- Messages are unconditionally removed latest {{ config.delete_mails_after }} days after arriving on the server.
+  Earlier, if storage may exceed otherwise.
+
+
+### <a name="account-deletion"></a> Account deletion 
+
+If you remove a {{ config.mail_domain }} profile from within the Delta Chat app, 
+then the according account on the server, along with all associated data,
+is automatically deleted {{ config.delete_inactive_users_after }} days afterwards. 
+
+If you use multiple devices 
+then you need to remove the according chat profile from each device
+in order for all account data to be removed on the server side. 
+
+If you have any further questions or requests regarding account deletion
+please send a message from your account to {{ config.privacy_mail }}. 
+
 
 ### Who are the operators? Which software is running? 
 

www/src/privacy.md

@@ -3,8 +3,8 @@
 
 {% if config.mail_domain == "nine.testrun.org" %}
 Welcome to `{{config.mail_domain}}`, the default chatmail onboarding server for Delta Chat users. 
-It is operated on the side by a small sysops team employed by [merlinux](https://merlinux.eu),
+It is operated on the side by a small sysops team
-an open-source R&D company also acting as the fiscal sponsor of Delta Chat app developments. 
+on a voluntary basis.
 See [other chatmail servers](https://delta.chat/en/chatmail) for alternative server operators. 
 {% endif %}
 
@@ -23,18 +23,22 @@ A chatmail server behaves more like the Signal messaging server
 but does not know about phone numbers and securely and automatically interoperates 
 with other chatmail and classic e-mail servers. 
 
-In particular, this chatmail server 
+Unlike classic e-mail servers, this chatmail server 
 
 - unconditionally removes messages after {{ config.delete_mails_after }} days,
 
 - prohibits sending out un-encrypted messages,
 
-- only has temporary log files used for debugging purposes.
+- does not store Internet addresses ("IP addresses"), 
+
+- does not process IP addresses in relation to email addresses.
+
+Due to the resulting lack of personal data processing
+this chatmail server may not require a privacy policy.
+
+Nevertheless, we provide legal details below to make life easier
+for data protection specialists and lawyers scrutinizing chatmail operations.
 
-Legally, authorities might still regard chatmail as a "classic e-mail" server
-which collects and retains personal data. 
-We do not agree on this interpretation. Nevertheless, we provide more legal details below
-to make life easier for data protection specialists and lawyers scrutinizing chatmail operations. 
 
 
 ## 1. Name and contact information 
@@ -54,18 +58,18 @@ We have appointed a data protection officer:
 
 ## 2. Processing when using chat e-mail services
 
-We provide e-mail services optimized for the use from [Delta Chat](https://delta.chat) apps 
+We provide services optimized for the use from [Delta Chat](https://delta.chat) apps
 and process only the data necessary
-for the setup and technical execution of the e-mail dispatch.
+for the setup and technical execution of message delivery.
-The purpose of the processing is to
+The purpose of the processing is that users can
-read, write, manage, delete, send, and receive emails.
+read, write, manage, delete, send, and receive chat messages.
 For this purpose,
 we operate server-side software
-that enables us to send and receive e-mail messages.
+that enables us to send and receive messages.
-Allowing the use of the e-mail service,
-we process the following data and details:
 
-- Outgoing and incoming messages (SMTP) are stored for transit 
+We process the following data and details:
+
+- Outgoing and incoming messages (SMTP) are stored for transit
   on behalf of their users until the message can be delivered.
 
 - E-Mail-Messages are stored for the recipient and made accessible via IMAP protocols,
@@ -74,9 +78,15 @@ we process the following data and details:
 
 - IMAP and SMTP protocols are password protected with unique credentials for each account.
 
-- Users can retrieve or delete all stored messages 
+- Users can retrieve or delete all stored messages
   without intervention from the operators using standard IMAP client tools.
 
+- Users can connect to a "realtime relay service"
+  to establish Peer-to-Peer connection between user devices,
+  allowing them to send and retrieve ephemeral messages
+  which are never stored on the chatmail server, also not in encrypted form.
+
+
 ### 2.1 Account setup
 
 Creating an account happens in one of two ways on our mail servers: 
@@ -253,7 +263,7 @@ is the `{{ config.privacy_supervisor }}`.
 ## 6. Validity of this privacy policy 
 
 This data protection declaration is valid
-as of *December 2023*.
+as of *October 2024*.
 Due to the further development of our service and offers
 or due to changed legal or official requirements,
 it may become necessary to revise this data protection declaration from time to time.