From: Alex Dehnert <alex@dehnerts.com>
Date: Sun, 10 Jul 2022 23:08:39 +0000 (-0400)
Subject: spam: Enable DKIM processing
X-Git-Url: https://dehnerts.com/gitweb/?a=commitdiff_plain;h=86afbcb7ac76b8a0cbc993c993a58da3591b3a69;hp=86afbcb7ac76b8a0cbc993c993a58da3591b3a69;p=sysconfig%2Fpostfix.git

spam: Enable DKIM processing

- Add OpenDKIM as a milter to do signing and verification
- Switch to after-queue filtering (content_filter), because apparently
  smtpd_proxy_filter prevents milters from getting the message DATA[1]. This
  means if the spam filter rejects the message, we need to send a bounce,
  rather than returning it in the same session, but I don't think I currently
  have SpamAssassin rejecting anything, so that seems okay.

[1] https://mailing.postfix.users.narkive.com/8CT5J48q/milter-and-smtpd-proxy-filter
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