[Bug 1845751] [NEW] cc modification due to nodup setting breaks DKIM & thus DMARC

[Ian Kelling]

Public bug reported:

Keeping DKIM signature intact allows passing DMARC without from munging
(I have references all about this if needed). However, mailman modifies
the cc header when a subscriber has the nodup setting and someone sends
to the list with that subscriber cced. Mailman doesn't email them and
removes them from the cc, presumably so for further replies mailman can
email them without it being a duplicate and they get all the good
mailman headers instead of a plain email from the cc.  Anyways, best if
Mailman just not modify the cc if we are in the situation where it
matters for passing DMARC. The attached patch does that.

Note, I'm sending this as an employee of the Free Software Foundation
and my copyright is already going to them.

** Affects: mailman
     Importance: Undecided
         Status: New

** Patch added: "nodup-dkim.patch"
   https://bugs.launchpad.net/bugs/1845751/+attachment/5292024/+files/nodup-dkim.patch

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Title:
  cc modification due to nodup setting breaks DKIM & thus DMARC

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