André Peters:

I run a smtpd_milter to sign mail via OpenDKIM. This happens
before-queue, right?
in your setup, right.

Next this signed mail goes through a Spamassassin content-filter, which
adds some X-Headers after-queue.

How can this mail still have a valid DKIM signature?
OpenDKIM don't sign X- headers by default and your spamassassin don't alter the messages.
So the signatures keep valid.

Andreas

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