[Mailman-Users] List adds information to sender's name

Mark Sapiro mark at msapiro.net
Wed Sep 20 15:21:57 EDT 2017

On 09/20/2017 09:32 AM, Christian F Buser via Mailman-Users wrote:
> On Tue, 19 Sep 2017 15:37:50 -0400 (EDT), you wrote:
>> You are seeing the "Mung From" option behaviour.
> Strange. Settings for the list are: 
> Replace the From: header address with the list's posting address to mitigate issues stemming from the original From: domain's DMARC or similar policies.
> NO

This is the from_is_list setting which controls DMARC mitigations
applied to ALL messages.

You also need to look at Privacy options... -> Sender filters settings
dmarc_moderation_action and dmarc_quarantine_moderation_action which
control the mitigations applied to messages From: domains that publish
DMARC policies of reject and quarantine.

> What happens, if I set the list not to add/change the Reply-To header, and still set the list address in the Explicit Reply-To header field? I guess Mailman will just ignore that field - or not? 

If reply_goes_to_list is Explicit address, mailman will add
reply_to_address to Reply-To: and if that's the list posting address,
it's no different from setting reply_goes_to_list to This list.

If reply_goes_to_list is Poster, Mailman won't add anything to Reply-To:
for this reason, but it will still honor first_strip_reply_to and add
the original From: to Reply-To: if the From: is munged.

> If there are better settings to accomplish the goals, this would be very helpful. 

You need to do something to mitigate DMARC or all posts to the list
From: domains that publish DMARC p=reject will be bounced by many
recipients ISPs. For advice on what you can do, see

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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