On 9/22/23 04:47, Andrew Hodgson wrote:
Yesterday using the Mailman Shell I unbounced all the users on that list. We had a couple of messages yesterday and I also enabled the From munging for all messages sent to the list partway through those messages coming to the list. This morning we got all Gmail users bounced again, with no NDR attached to the message.
However on one of the messages the NDR was attached, and so I'm going to send that to Mark separately. It looks like the NDR included the information for all the bouncing messages though, and that is probably because Mailman sends the messages to all users in one SMTP transaction.
There is only one DSN that mentions several users (I haven't received that, but I don't need it). Mailman will process that as a bounce for each mentioned user. Now, when that results in delivery being disabled for the users, the admin receives a separate notice for each user. Each notice should have the DSN attached, but the issue is when the first notice is processed, the saved DSN is deleted from the message store, so it isn't available for the subsequent notices. This is now https://gitlab.com/mailman/mailman/-/issues/1101
The message returned from Google was:
user@gmail.com 9/22/2023 9:44:55 AM - Server at PAVPR08MB9257.eurprd08.prod.outlook.com returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError' 9/22/2023 9:24:03 AM - Server at gmail-smtp-in.l.google.com (142.250.27.27) returned '421 4.4.2 Connection dropped due to SocketError'
First, these appear to be due to some issue between the Server at PAVPR08MB9257.eurprd08.prod.outlook.com and the Server at gmail-smtp-in.l.google.com rather than gmail actually rejecting the message.
Second, these are delayed bounces. PAVPR08MB9257.eurprd08.prod.outlook.com has been retrying the message for some time (perhaps as much as 5 days) and has finally given up and returned the bounce. Thus, you will probably see more of these from older messages as they finally bounce.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan