With "default" (like it was for SMTP) or not set (like it was for IMAP), both TLS and STARTTLS are tried. Trying STARTTLS against TLS port is going to timeout because in STARTTLS server talks first, but when connected to TLS port the server waits for TLS client hello and does not send anything. Should not actually matter in tests which connect successfully on the first try because implicit TLS is tried first.
Chatmail relays for end-to-end encrypted email
Chatmail relay servers are interoperable Mail Transport Agents (MTAs) designed for:
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Zero State: no private data or metadata collected, messages are auto-deleted, low disk usage
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Instant/Realtime: sub-second message delivery, realtime P2P streaming, privacy-preserving Push Notifications for Apple, Google, and Huawei;
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Security Enforcement: only strict TLS, DKIM and OpenPGP with minimized metadata accepted
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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