On 11/8/21 11:10 AM, dancab@caltech.edu wrote:
We do have mailman@caltech.edu configured with valid members/owners. We're using Postfix for the MTA. Is it possible there's a misconfiguration there?
We've been testing the system with a handful of lists for months.
The bounce you saw
From: Mailman mailman@example.com To: Mailman Bounces mailman-bounces@example.com Subject: SMTP Delivery Failure
may have sent because you have VERP probes enabled (verp_probes: yes in the mta section of mailman.cfg) and a user on some list reached the bounce score threshold and a Mailman attempted to send a probe and the MTA refused the message, or it may have been sent because Mailman attempted to send a message to the user and the MTA refused it.
In either case, the bounce message (fake DSN) should have contained a message body like
Mail to user@example.com failed at outgoing SMTP
with the actual user's address. These fake DSNs are sent in the case where the outgoing MTA refuses a message from Mailman so there is no actual failure DSN.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan