Peter via Postfix-users skrev den 2023-03-26 06:15:

DKIM and ARC signatures need to be checked right after the message is
received,

not really, all that is needed is to frezze stata of dkim, arc, dmarc at recieve state, when this is frezzed in arc, then downstreams can trust it or dont care :)

new signatures need to be generated right before the message
is sent,

not really, this stage would be waste of resources

any changes to the message need to be done in-between, all of
this regardless of however else you set up the system.  I would think
that this would be obvious.

majordomo did not break dkim, dovecot maillist still dont, and are still using mailman, thumps up, it works

https://datatracker.ietf.org/person/[email protected] good references
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