This question has stirred up a lot of answers but if I’m understanding
correctly, it looks like I cannot use opendmarc with amavisd in
postfix as a pre-queue filter for dkim. The only viable option is
opendkim with opendmarc as pre-queue milters like I was originally doing.
Conceptually you can. I tested it yesterday and it worked. At first I
encountered said phenomenon that the mails in my inbox had no DMARC AR
header, but that was because the content_filter Amavis removed them.
After disabling DKIM verification on the content_filter, headers looked
like this:
Authentication-Results: arcsin.de; dmarc=pass (p=quarantine dis=none)
header.from=arcsin.de
Authentication-Results: arcsin.de; spf=none smtp.mailfrom=redacted
X-Spam-Flag: NO
X-Spam-Score: -1.142
X-Spam-Level:
X-Spam-Status: No, score=-1.142 tagged_above=-100 required=6.31
tests=[...redacted...]
autolearn=unavailable autolearn_force=no
Authentication-Results: arcsin.de (amavis); dkim=pass (2048-bit key)
header.d=arcsin.de
OpenDKIM was not involved here.
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