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docs: Update DKIM section in overview.rst

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We are now using dkim-milter instead of OpenDKIM.

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
This commit is contained in:
Jagoda Ślązak
2026-01-29 11:30:13 +01:00
parent 1726ee7c67
commit 40c93ffe52
1 changed files with 1 additions and 3 deletions
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doc/source/overview.rst
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@@ -268,12 +268,10 @@ Chatmail relays enforce :rfc:`DKIM <6376>` to authenticate incoming emails.
Incoming emails must have a valid DKIM signature with
Signing Domain Identifier (SDID, ``d=`` parameter in the DKIM-Signature
header) equal to the ``From:`` header domain. This property is checked
by OpenDKIM screen policy script before validating the signatures. This
by dkim-milter ``reject_failures = author-mismatch `` policy. This
corresponds to strict :rfc:`DMARC <7489>` alignment (``adkim=s``).
If there is no valid DKIM signature on the incoming email, the
sender receives a “5.7.1 No valid DKIM signature found” error.
After validating the DKIM signature,
the `final.lua` script strips all ``OpenDKIM:`` headers to reduce message size on disc.
Note that chatmail relays