holger krekel f65ecc23fa fix: DNS check timeout with IPv6-broken authoritative NS
Add IPv4 fallback for authoritative NS queries in query_dns().
When dig @ns returns no useful answer (e.g. IPv6 transport to
the NS times out), retry with -4 to force IPv4. Also limits
timeout and tries (+timeout=10 +tries=2) to avoid hanging.

Fixes #851
2026-04-30 23:59:41 +02:00
2026-04-29 16:58:19 +00:00
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 strict TLS, DKIM and OpenPGP with minimized metadata accepted

  • 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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