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"
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 -- Robert L Mathews
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