8000 Remove DKIM signature after checking it · Issue #530 · chatmail/relay · GitHub
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Remove DKIM signature after checking it #530

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link2xt opened this issue Mar 24, 2025 · 0 comments · May be fixed by #533
Open

Remove DKIM signature after checking it #530

link2xt opened this issue Mar 24, 2025 · 0 comments · May be fixed by #533

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@link2xt
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link2xt commented Mar 24, 2025

DKIM signature is currently checked by OpenDKIM milter attached to smtpd running on port 25. Once it is checked, it is not useful for anything. You cannot change it later because the key may change (see #195). As RFC 6376 states it: "message archiving is not a design goal".

As far as I see from the diagram in https://www.postfix.org/MILTER_README.html#plumbing, cleanup happens after smtpd is done with the message. cleanup is essentially a daemon that puts the message into the queue, so we can remove all unnecessary headers there, including DKIM signature.

This will save users some traffic and server operators some disk space because DKIM headers are quite large compared to other headers.
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Remove DKIM-Signature from incoming mail after checking chatmail/relay
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