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feat: support setup without domain, with only an IPv4 address (#963)

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* dovecot: enable login names with square brackets

* config: make IPv4-only relays use self-signed TLS certs

* postfix: make delivery for IP-only relays work

* cmdeploy: skip DNS checks for IPv4 only relays

* www: generate dclogin codes for IPv4-only relays

* opendkim: disable DKIM signing on ipv4-only relays

* get delivery working

* get tests working on IPv4 only machine

* doc: document IPv4-only relays

* dns: warn if mail_domain is an IP, instead of checking DNS

* config: validate domains when formatting them

* ci: add cmlxc testing for no-DNS relays

* ci: run no-dns and normal CI in parallel

* retain "config.mail_domain" as the domain part of @ email addresses, so for ipv4 relays  "[1.2.3.4]" and introduce config.ipv4_relay and config.mail_domain_bare helpers.

* ci: migrate from --no-dns to --type ipv4 for cmlxc compatibility

* cleanup dead code, fix docs, fixate cmlxc version

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Co-authored-by: missytake <missytake@systemli.org>
This commit is contained in:
holger krekel
2026-05-11 21:52:33 +02:00
committed by GitHub
parent 6a7e6ce9e7
commit 4ebde2825d
26 changed files with 256 additions and 87 deletions
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doc/source/faq.rst
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@@ -15,6 +15,7 @@ goes beyond what classic email servers offer:
streaming, privacy-preserving Push Notifications for Apple, Google, and `Ubuntu Touch <https://docs.ubports.com/en/latest/appdev/guides/pushnotifications.html>`_;
- **Security Enforcement**: only strict TLS, DKIM and OpenPGP with minimized metadata accepted
(DKIM is not enforced on :ref:`IP-only relays <iponly>`)
- **Reliable Federation and Decentralization:** No spam or IP reputation checks, federating
depends on established IETF standards and protocols.