> On May 3, 2022, at 9:30 AM, John R. Hogerhuis <[email protected]> wrote: > If anyone has a suggestion that I can try in Mailman I'll try it.
Hi John, In my own opinion the safest thing to do is to sigh and implement one of mailman's two header munging policies: Option A is: set dmarc_mitigate_action to munge_from set (if not already enabled, it appears to be) reply_goes_to_list net result: mailman will look up the submitter's DMARC record, and if policy=quarantine or policy=reject is set, munge the header; messages will look a little different if submitted by one of those users. Option B is: set dmarc_mitigate_action to munge_from set dmarc_mitigate_unconditionally set reply_goes_to_list net result: mailman will always munge From: regardless of the submitter's ESP policy; messages will look a little different. Option C -- leaving well enough alone -- should be on the table as well, for a variety of reasons. Note also that I haven't run a mailman of my own for over a decade, well before the publication of RFC7489. The suggested configurations are based on doc reading and applying the lessons of running (non-mailman) mail systems at work that deliver a million messages a day.
