j4n 4cdccee63b feat(mtail): deploy filtermail.mtail and gate mtail rule copy on mtail_address
Deploy filtermail.mtail program along delivered_mail.mtail, fetched from
upstream; for this, refactor download_executable to accept mode, so we
can use it to upload non-binaries.
refactor: make hashes (for uniformity) and mtail version (for use by
mtail deployer) module constants.

Additionally, gate both mtail programs on mtail_address being set.
2026-08-26 13:19:54 +02:00
2026-08-24 17:51:05 +02:00
2025-12-18 09:21:19 +01:00

Chatmail relays for end-to-end encrypted email

Chatmail relay servers are interoperable Mail Transport Agents (MTAs) designed for:

  • Zero State: no private data or metadata collected, messages are auto-deleted, low disk usage

  • Instant/Realtime: sub-second message delivery, realtime P2P streaming, privacy-preserving Push Notifications for Apple, Google, and Huawei;

  • Security Enforcement: Only connections with strict TLS are accepted; all messages must be correctly signed with DKIM and OpenPGP-encrypted with minimized metadata. There are experimental exceptions for no-DNS relays, which are allowed use self-signed TLS certificates and which do not need to DKIM-sign their messages. Unencrypted messages are allowed in neither case.

  • Reliable Federation and Decentralization: No spam or IP reputation checks, federating depends on established IETF standards and protocols.

This repository contains everything needed to setup a ready-to-use chatmail relay on an ssh-reachable host. For getting started and more information please refer to the web version of this repositories' documentation at

https://chatmail.at/doc/relay

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