Remove DKIM-Signature from incoming mail after checking

update some links

CHANGELOG.md

@@ -2,69 +2,90 @@
 
 ## untagged
 
+- Remove `DKIM-Signature` from incoming mails after verifying
+  ([#530](https://github.com/chatmail/server/pull/530))
+
+- Send SNI when connecting to outside servers
+  ([#524](https://github.com/chatmail/server/pull/524))
+
+- 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/chatmail/pull/497))
+  ([#497](https://github.com/chatmail/server/pull/497))
 
 - cmdeploy dns: offer alternative DKIM record format for some web interfaces
-  ([#470](https://github.com/deltachat/chatmail/pull/470))
+  ([#470](https://github.com/chatmail/server/pull/470))
 
 - journald: remove old logs from disk
-  ([#490](https://github.com/deltachat/chatmail/pull/490))
+  ([#490](https://github.com/chatmail/server/pull/490))
 
 - opendkim: restart once every day to mend RAM leaks
-  ([#498](https://github.com/chatmail/chatmail/pull/498)
+  ([#498](https://github.com/chatmail/server/pull/498)
 
 - migration guide: let opendkim own the DKIM keys directory
-  ([#468](https://github.com/deltachat/chatmail/pull/468))
+  ([#468](https://github.com/chatmail/server/pull/468))
 
 - improve secure-join message detection
-  ([#473](https://github.com/deltachat/chatmail/pull/473))
+  ([#473](https://github.com/chatmail/server/pull/473))
 
 - use old crypt lib in python < 3.11
-  ([#483](https://github.com/deltachat/chatmail/pull/483))
+  ([#483](https://github.com/chatmail/server/pull/483))
 
 - chatmaild: set umask to 0700 for doveauth + metadata
-  ([#490](https://github.com/deltachat/chatmail/pull/492))
+  ([#490](https://github.com/chatmail/server/pull/492))
 
 - remove MTA-STS daemon
-  ([#488](https://github.com/deltachat/chatmail/pull/488))
+  ([#488](https://github.com/chatmail/server/pull/488))
 
 - replace `Subject` with `[...]` for all outgoing mails.
-  ([#481](https://github.com/deltachat/chatmail/pull/481))
+  ([#481](https://github.com/chatmail/server/pull/481))
 
 - opendkim: use su instead of sudo
-  ([#491](https://github.com/deltachat/chatmail/pull/491))
+  ([#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/deltachat/chatmail/pull/463))
+  ([#463](https://github.com/chatmail/server/pull/463))
 
 - add `--all` to `cmdeploy dns`
-  ([#462](https://github.com/deltachat/chatmail/pull/462))
+  ([#462](https://github.com/chatmail/server/pull/462))
 
 - fix `_mta-sts` TXT DNS record
-  ([#461](https://github.com/deltachat/chatmail/pull/461)
+  ([#461](https://github.com/chatmail/server/pull/461)
 
 - deploy `iroh-relay` and also update "realtime relay services" in privacy policy. 
-  ([#434](https://github.com/deltachat/chatmail/pull/434))
+  ([#434](https://github.com/chatmail/server/pull/434))
-  ([#451](https://github.com/deltachat/chatmail/pull/451))
+  ([#451](https://github.com/chatmail/server/pull/451))
 
 - add guide to migrate chatmail to a new server
-  ([#429](https://github.com/deltachat/chatmail/pull/429))
+  ([#429](https://github.com/chatmail/server/pull/429))
 
 - disable anvil authentication penalty
-  ([#414](https://github.com/deltachat/chatmail/pull/444)
+  ([#414](https://github.com/chatmail/server/pull/444)
 
 - increase `request_queue_size` for UNIX sockets to 1000.
-  ([#437](https://github.com/deltachat/chatmail/pull/437))
+  ([#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/deltachat/chatmail/pull/439))
+  ([#439](https://github.com/chatmail/server/pull/439))
 
 - query autoritative nameserver to bypass DNS cache
-  ([#424](https://github.com/deltachat/chatmail/pull/424))
+  ([#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/)
@@ -74,195 +95,195 @@
   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/deltachat/chatmail/pull/388))
+  ([#388](https://github.com/chatmail/server/pull/388))
 
 - fix checking for required DNS records
-  ([#412](https://github.com/deltachat/chatmail/pull/412))
+  ([#412](https://github.com/chatmail/server/pull/412))
 
 - add support for specifying whole domains for recipient passthrough list
-  ([#408](https://github.com/deltachat/chatmail/pull/408))
+  ([#408](https://github.com/chatmail/server/pull/408))
 
 - add a paragraph about "account deletion" to info page 
-  ([#405](https://github.com/deltachat/chatmail/pull/405))
+  ([#405](https://github.com/chatmail/server/pull/405))
 
 - avoid nginx listening on ipv6 if v6 is dsiabled 
-  ([#402](https://github.com/deltachat/chatmail/pull/402))
+  ([#402](https://github.com/chatmail/server/pull/402))
 
 - refactor ssh-based execution to allow organizing remote functions in
   modules. 
-  ([#396](https://github.com/deltachat/chatmail/pull/396))
+  ([#396](https://github.com/chatmail/server/pull/396))
 
 - trigger "apt upgrade" during "cmdeploy run" 
-  ([#398](https://github.com/deltachat/chatmail/pull/398))
+  ([#398](https://github.com/chatmail/server/pull/398))
 
 - drop hispanilandia passthrough address
-  ([#401](https://github.com/deltachat/chatmail/pull/401))
+  ([#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/deltachat/chatmail/pull/413))
+  ([#413](https://github.com/chatmail/server/pull/413))
 
 - fix OpenPGP payload check
-  ([#435](https://github.com/deltachat/chatmail/pull/435))
+  ([#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/deltachat/chatmail/pull/438))
+  ([#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/393))
+  ([#393](https://github.com/chatmail/server/pull/393))
-  ([#394](https://github.com/deltachat/chatmail/pull/394))
+  ([#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
@@ -270,27 +291,27 @@
 ### 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

@@ -1,21 +1,55 @@
 
 <img width="800px" src="www/src/collage-top.png"/>
 
-# Chatmail services optimized for Delta Chat apps 
+# Chatmail servers for secure instant messaging 
 
-This repository helps to setup a ready-to-use chatmail server
+Chatmail servers are minimal interoperable e-mail routing machines designed for:
+
+- **Convenience:** Instant onboarding, with optional Google/Apple/Huawei push notifications
+
+- **Privacy:** Just login, no questions asked, no name, numbers or e-mail needed
+
+- **Speed:** End-to-End Message delivery in well under a second
+
+- **Security:** Strict TLS, DKIM and OpenPGP with metadata-minimization enforced. 
+
+- **Relaxation:** No annoying spam-checking, IP reputation or rate limits
+
+- **Efficiency:** messages are only stored for transit and removed automatically. 
+
+This repository contains everything needed to setup a ready-to-use chatmail server
 comprised of a minimal setup of the battle-tested 
 [postfix smtp](https://www.postfix.org) and [dovecot imap](https://www.dovecot.org) services. 
 
-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 by a 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/apps.html) which offer instant onboarding on chatmail servers,
-after which the initially specified password is required for using them. 
+and [this list of known public 3rd party chatmail servers](https://delta.chat/en/chatmail). 
 
-## 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 
+
+You will need the following: 
+
+- control over a domain through a DNS provider of your choice, 
+
+- a remote Debian 12 machine with IPV4 and preferably also IPV6 addresses and
+  reachable SMTP/SUBMISSIONS/IMAPS/HTTPS ports. 
+  Machine needs 1GB RAM, one slow CPU and maybe 10GB storage for a
+  few thousand active chatmail addresses,
+
+- a terminal window with password-less ssh root login to the remote machine;
+  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.
+
+
+## Getting started 
 
 We use `chat.example.org` as the chatmail domain in the following steps. 
 Please substitute it with your own domain. 
@@ -23,7 +57,7 @@ Please substitute it with your own domain.
 1. Install the `cmdeploy` command in a virtualenv
 
    ```
-    git clone https://github.com/deltachat/chatmail
+    git clone https://github.com/chatmail/server
     cd chatmail
     scripts/initenv.sh
    ```
@@ -82,11 +116,11 @@ scripts/cmdeploy bench
 
 This repository has four directories:
 
-- [cmdeploy](https://github.com/deltachat/chatmail/tree/main/cmdeploy)
+- [cmdeploy](https://github.com/chatmail/server/tree/main/cmdeploy)
   is a collection of configuration files
   and a [pyinfra](https://pyinfra.com)-based deployment script.
 
-- [chatmaild](https://github.com/deltachat/chatmail/tree/main/chatmaild)
+- [chatmaild](https://github.com/chatmail/server/tree/main/chatmaild)
   is a python package containing several small services
   which handle authentication,
   trigger push notifications on new messages,
@@ -95,12 +129,12 @@ This repository has four directories:
   and some other minor things.
   chatmaild can also be installed as a stand-alone python package.
 
-- [www](https://github.com/deltachat/chatmail/tree/main/www)
+- [www](https://github.com/chatmail/server/tree/main/www)
   contains the html, css, and markdown files
   which make up a chatmail server's web page.
   Edit them before deploying to make your chatmail server stand out.
 
-- [scripts](https://github.com/deltachat/chatmail/tree/main/scripts)
+- [scripts](https://github.com/chatmail/server/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
@@ -139,39 +173,39 @@ If you deploy them with cmdeploy,
 they are run by systemd services in the background.
 A short overview:
 
-- [`doveauth`](https://github.com/deltachat/chatmail/blob/main/chatmaild/src/chatmaild/doveauth.py) implements
+- [`doveauth`](https://github.com/chatmail/server/blob/main/chatmaild/src/chatmaild/doveauth.py) implements
   create-on-login account creation semantics and is used
   by Dovecot during login authentication and by Postfix
   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 send mails for them.
 
-- [`filtermail`](https://github.com/deltachat/chatmail/blob/main/chatmaild/src/chatmaild/filtermail.py) prevents
+- [`filtermail`](https://github.com/chatmail/server/blob/main/chatmaild/src/chatmaild/filtermail.py) prevents
   unencrypted e-mail from leaving the chatmail service
   and is integrated into postfix's outbound mail pipelines.
 
-- [`chatmail-metadata`](https://github.com/deltachat/chatmail/blob/main/chatmaild/src/chatmaild/metadata.py) is contacted by a
+- [`chatmail-metadata`](https://github.com/chatmail/server/blob/main/chatmaild/src/chatmaild/metadata.py) is contacted by a
-  [dovecot lua script](https://github.com/deltachat/chatmail/blob/main/cmdeploy/src/cmdeploy/dovecot/push_notification.lua)
+  [dovecot lua script](https://github.com/chatmail/server/blob/main/cmdeploy/src/cmdeploy/dovecot/push_notification.lua)
   to store user-specific server-side config.
   On new messages,
-  it [passes the user's push notification token](https://github.com/deltachat/chatmail/blob/main/chatmaild/src/chatmaild/notifier.py)
+  it [passes the user's push notification token](https://github.com/chatmail/server/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.
 
-- [`delete_inactive_users`](https://github.com/deltachat/chatmail/blob/main/chatmaild/src/chatmaild/delete_inactive_users.py)
+- [`delete_inactive_users`](https://github.com/chatmail/server/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/deltachat/chatmail/blob/main/chatmaild/src/chatmaild/lastlogin.py)
+- [`lastlogin`](https://github.com/chatmail/server/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/deltachat/chatmail/blob/main/chatmaild/src/chatmaild/echo.py)
+- [`echobot`](https://github.com/chatmail/server/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/deltachat/chatmail/blob/main/chatmaild/src/chatmaild/metrics.py)
+- [`chatmail-metrics`](https://github.com/chatmail/server/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
@@ -228,8 +262,8 @@ While this file is present, account creation will be blocked.
 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).
 
-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 server.
 
 ## Email authentication
 
@@ -256,6 +290,32 @@ and rejects incorrectly authenticated emails with [`reject_sender_login_mismatch
 `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 from a chatmail server to your server,
+the problem is likely that your server does not have a valid TLS certificate.
+
+You can test it by resolving `MX` records of your server domain
+and then connecting to MX servers (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 server,
+make sure to provide the full certificate chain
+and not just the last certificate.
+
+If you are running Exim server and don't see incoming connections
+from a chatmail 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 chatmail server to a new host
 
 If you want to migrate chatmail from an old machine
@@ -290,9 +350,9 @@ to make sure you can connect with SSH.
 5. Now, point DNS to the new IP addresses.
 
    You can already remove the old IP addresses from DNS.
-   Existing Delta Chat users will still be able to connect
+   Existing Chatmail app users or bots will still be able to connect
    to the old server, send and receive messages,
-   but new users will fail to create new profiles
+   but new ones will fail to create new profiles
    with your chatmail server.
 
    If other servers try to deliver messages to your new server they will fail,

chatmaild/src/chatmaild/filtermail.py

@@ -196,7 +196,9 @@ 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):

cmdeploy/src/cmdeploy/__init__.py

@@ -215,7 +215,7 @@ 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}"
             ],
             _use_su_login=True,
             _su_user="opendkim",
@@ -228,7 +228,6 @@ def _configure_opendkim(domain: str, dkim_selector: str = "dkim") -> bool:
     )
     need_restart |= service_file.changed
 
-
     return need_restart
 
 
@@ -275,7 +274,18 @@ def _configure_postfix(config: Config, debug: bool = False) -> bool:
     )
     need_restart |= master_config.changed
 
-    header_cleanup = files.put(
+    incoming_header_cleanup = files.put(
+        src=importlib.resources.files(__package__).joinpath(
+            "postfix/incoming_header_cleanup"
+        ),
+        dest="/etc/postfix/incoming_header_cleanup",
+        user="root",
+        group="root",
+        mode="644",
+    )
+    need_restart |= incoming_header_cleanup.changed
+
+    submission_header_cleanup = files.put(
         src=importlib.resources.files(__package__).joinpath(
             "postfix/submission_header_cleanup"
         ),
@@ -284,7 +294,7 @@ def _configure_postfix(config: Config, debug: bool = False) -> bool:
         group="root",
         mode="644",
     )
-    need_restart |= header_cleanup.changed
+    need_restart |= submission_header_cleanup.changed
 
     # Login map that 1:1 maps email address to login.
     login_map = files.put(

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/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 +7 -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/mtail/mtail.service.j2

@@ -3,7 +3,7 @@ Description=mtail
 
 [Service]
 Type=simple
-ExecStart=/bin/sh -c "journalctl -f -o short-iso -n 0 | /usr/bin/mtail --address={{ address }} --port={{ port }} --progs /etc/mtail --logtostderr --logs -"
+ExecStart=/bin/sh -c "journalctl -f -o short-iso -n 0 | /usr/bin/mtail --address={{ address }} --port={{ port }} --progs /etc/mtail --logtostderr --logs /dev/stdin"
 Restart=on-failure
 
 [Install]

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

@@ -46,10 +46,7 @@ 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;
 

cmdeploy/src/cmdeploy/postfix/incoming_header_cleanup

@@ -0,0 +1 @@
+/^DKIM-Signature:/            IGNORE

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

@@ -21,6 +21,9 @@ smtpd_tls_security_level=may
 
 smtp_tls_CApath=/etc/ssl/certs
 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 = inline:{nauta.cu=may}
 smtpd_tls_protocols = >=TLSv1.2

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

@@ -32,7 +32,6 @@ 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
@@ -50,10 +49,10 @@ 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
+  -o header_checks=regexp:/etc/postfix/incoming_header_cleanup
 qmgr      unix  n       -       n       300     1       qmgr
 #qmgr     unix  n       -       n       300     1       oqmgr
 tlsmgr    unix  -       -       y       1000?   1       tlsmgr
@@ -81,6 +80,7 @@ filter    unix -        n       n       -       -       lmtp
 # Local SMTP server for reinjecting filered mail.
 localhost:{{ 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
 
 # Cleanup `Received` headers for authenticated mail
@@ -89,5 +89,10 @@ localhost:{{ config.postfix_reinject_port }} inet  n       -       n       -
 # 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