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Remove DKIM-Signature from incoming mail after checking (#747)

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The original https://github.com/chatmail/relay/pull/533 attempted to remove the header through postfix, but that is too early. Instead, remove the headers in the OpenDKIM `final.lua` script after the validation.
This commit is contained in:
j4n
2025-12-04 12:23:27 +01:00
committed by GitHub
parent 96108bbaba
commit 166bf68915
2 changed files with 19 additions and 7 deletions
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4
doc/source/overview.rst
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@@ -273,9 +273,11 @@ 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
correpsonds to strict :rfc:`DMARC <7489>` alignment (``adkim=s``).
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