On 5/18/24 9:43 PM, Russell Clemings wrote:

I sent the post from my Yahoo account with no cc's and it was received by
my Gmail account, albeit in spam. My Yahoo account bounced the incoming
post from the list as did Comcast. The list owner (me) got bounce notices
from Mailman for both.


Did those notices have a DSN attached that included the headers of the bounced mail, and if so, what did the From: look like. And were the bounces for DMARC or something else?

Is Exim DKIM signing the outgoing mail. Does list.domain publish an SPF record, and if the IP changed does the SPF still allow the domain?


This is a test list. If nothing else from this strikes you as worth digging
into some more, I'll just wait until we have some on a real list and see if
anything looks different there.

This may be an issue with cPanel's Mailman. Try setting Privacy options... -> Sender filters -> dmarc_moderation_action to Munge From. It should be irrelevant when General Options -> from_is_list = Munge From, but I don't know what cPanel might be doing.

--
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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