[Mailman-Users] Reply-to header not set in mime encoded digest's

Mark Sapiro mark at msapiro.net
Mon Oct 29 17:51:00 EDT 2018

On 10/29/18 12:42 PM, David Gibbs wrote:
> When MM 2.1.29 sends out a mime encoded digest, the individual messages
> in the digest don't have the reply-to header set so replies go back to
> the list (as with non-digest messages).
> Is there any way to have the reply-to header set correctly on
> mime-digest messages?

This is a consequence of the way in which DMARC mitigations are applied
to outgoing messages. The modifications to the From:, Reply-To: and Cc:
headers are not applied to the message that is archived, sent in digests
or gated to usenet.

This is generally a good thing, but is problematic in that non-DMARC
Reply-To: munging is also deferred.

A simple, but possibly unsatisfactory solution is to put the following
two lines in mm_cfg.py

GLOBAL_PIPELINE.insert(GLOBAL_PIPELINE.index('ToOutgoing'), 'ToDigest')

This will cause the message to not be added to the digests until after
the header munging has occurred, but also means any DMARC actions to
munge the From: or wrap the message will be applied to the digested
message which may be undesirable.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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