Hi,

I'd like some help diagnosing an intermittent DMARC mung failure on Mailman 2.1.29.

Some of the time DMARC munging works perfectly fine, and then seemingly with no configuration changes, DMARC munging stops working. Then after restarting Mailman it may start working again. -- We don't have hard consistent data yet.

But we do have a sender that some of the time their system their messages come through with "First Last via List" <list@listdomain.example> and then other times their messages come through with "First Last" <sender@sendersdomain.example>.

No changes on the senders side / infrastructure and no changes on the mailing list config / infrastructure.

Does anyone have any recommendations on how to start troubleshooting this?

N.B. I don't have root on the system but I do have the ear of people that do. I might be able to check logs if I have read permission on them. I'm not seeing any obvious problems in the logs that I can read. I may have to relay diagnostic requests to the admins if I don't have permission.



--
Grant. . . .

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