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

Ian Kelling ian at iankelling.org
Wed Oct 16 18:04:16 EDT 2019


Mark, regarding this point "It fails to consider whether other DKIM
signature breaking transformations such as subject prefixing, addition
of headers/footers and content filtering are being done." It checks that
no DMARC mitigation is on. In that case, having any DKIM signature
breaking is already going to send invalid DMARC email, which seems to me
to be a bigger separate problem: I don't think mailman should allow that
combination of settings at all: don't send dmarc failing messages. Also,
in the case the list has no DMARC mitigation and is breaking DKIM, not
modifying the cc here will also prevent mailman from sending as many
DMARC failing messages, because it will detect more duplicates and not
send them. And, as you said, mailman 2 is going away. So, I think the
patch is good as is.

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

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