On Jul 31, 2024, at 1:19 AM, Matus UHLAR - fantomas via Postfix-users
<postfix-users@postfix.org> wrote:
FYI Mailman 2 claims to rewrite From: header to fullfill DMARC requirements only when DMARC policy
is "quarantine" or "reject"
On 01.08.24 12:12, Robert L Mathews via Postfix-users wrote:
That's the "dmarc_moderation_action" option in the "Sender filters" section
of the Mailman interface [1].
But there's also another option in the General Options section called
"from_is_list" [2] that does it for all messages. If set to "Munge From",
it "replaces the From: header address with the list's posting address to
mitigate issues stemming from the original From: domain's DMARC or similar
policies and puts the original From: address in a Reply-To: header".
[1]
https://wiki.list.org/DOC/Mailman%202.1%20List%20Administrators%20Manual#Sender_filters
[2]
https://wiki.list.org/DOC/Mailman%202.1%20List%20Administrators%20Manual#line-163
Yes, the latter applies generally for lists. But I consider this difference irelevant
because the topic is related to DMARC errors, and mailman 2's
dmarc_moderation_action applies when mail should be rejected because of
DMARC failure.
So, even setting DMARC policy to "quarantine" or "reject" would not cause
problems.
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
The early bird may get the worm, but the second mouse gets the cheese.
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