[Bug 1845751] Re: cc modification due to nodup setting breaks DKIM & thus DMARC
mark at msapiro.net
Fri Nov 8 14:15:52 EST 2019
I've been trying to decide what to do about this, and I've come up with
a plan. My issue with the @iank approach is it focuses solely on DMARC
and I think there could be other valid reasons for not wanting to break
DKIM in general regardless of DMARC. I considered a 'dont_break_dkim'
switch that would trump any message modifications, possibly based on
there being a DKIM sig in the message and what was signed, but even
without those conditions this is too big a change this late in the MM
So I've decided a 'drop_cc' switch with Yes the default and meaning
current behavior, but No meaning don't modify the Cc: in
AvoidDuplicates.py is just what @eblake is looking for and should also
satisfy @iank as far as not breaking DKIM for DMARC is concerned even
though it would apply to all messages and not just those where DMARC
might be an issue.
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cc modification due to nodup setting breaks DKIM & thus DMARC
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