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Hocuri cb1e4ff5bb docs(README.md): Clarify security enforcement (#1011)
Make it clear which security enforcement properties a chatmail server has
2026-06-17 12:38:37 +02:00

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# 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](https://chatmail.at/doc/relay)