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Switch to NixOS ACME module for certificate management

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Drop most of the existing certificate handling, because we're effectively
duplicating functionality that NixOS offers for free with better
design, testing and maintainance than what we could provide downstream.

The remaining two options are to reference an
existing `security.acme.certs` configuration through
`mailserver.x509.useACMEHost` or to provide existing key material via
`mailserver.x509.certificateFile` and `mailserver.x509.privateKeyFile`.

Support for automatic creation of self-signed certificates has been
removed, because it is undesirable in public mail setups.

The updated setup guide now displays the recommended configuration that
relies on the NixOS ACME module, but requires further customization to
select a suitable challenge.

Co-Authored-By: Emily <git@emilylange.de>
This commit is contained in:
Martin Weinelt
2025-10-19 23:20:00 +02:00
parent 18ee2a44ed
commit 33ba1ff52b
19 changed files with 166 additions and 239 deletions
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docs/release-notes.rst
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Release Notes
=============
NixOS 26.05
-----------
- Certificate handling was simplified. We recommend setting
:option:`mailserver.x509.useACMEHost` to a ``security.acme.certs``
configuration. If that does not fit your requirements, configure certificate
and private key using :option:`mailserver.x509.certificateFile` and
:option:`mailserver.x509.privateKeyFile` instead. Support for automatic
creation of self-signed certificates has been removed.
NixOS 25.11
-----------