I think I see what you are saying. If I have it right, you admin a domain that publishes DMARC p=none to get reports to assess the effect of going to a stronger DMARC policy, but you see reports due to Mailman list mail because Mailman does not apply DMARC mitigations to mail From: domains that publish DMARC p=none. So you would like Mailman to apply disruptive message transformations to mail From: your domain that would be transformed if you applied a stronger DMARC policy. My opinion is DMARC and mailing lists do not play well together. DMARC was originally intended to be used by domains such as those of financial institutions where mail From: those domains would only be for business purposes and not posted by individuals to mailing lists. It was mis-used by Yahoo and later AOL in a misguided attempt to make upo for prior security lapses, but was never intended to be used by domains that provided email service to users for personal use. While I don't understand what your domain is or what it is used for, I suggest that if individuals are allowed/encouraged to send personal mail From: your domain to email lists, that DMARC p=quarantine or p=reject policies are inappropriate. ** Changed in: mailman Importance: Undecided => Wishlist ** Changed in: mailman Status: New => Won't Fix -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/1539384 Title: Non-blocking DMARC mitigations should also be done for p=none To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/1539384/+subscriptions