Situation:
1. List admin's domain is hosted by a server run by a hosting company.
2. The server is (probably) running Linux
3. Mailman 2.1.2 is provided on the server with, I believe, CPanel
4. The server's MTA appears to be Exim 4.20 handling both incoming and outgoing messages to/from Mailman
5. Mailman list's basically work OK much of the time
6. Periodically messages out from Mailman are being bounced en masse leading to the subscriber accounts being disabled
7. The bounce response attached to the bounce action notice produced by Mailman when subscribers are disabled in these circumstances is from the server local MTA. The MTA lists what appears to be all the addresses to which the outgoing message was sent with a note against each saying "unrouteable mail domain maildomain.tld". The bounce response asserts that this is a permanent failure. The messages are each being sent to a number of different mail domains not just a single one
8. The list admin with the problem has no access to either the Mailman or MTA logs
9. The server administrator is supposedly claiming that these bounces are a result of "a bug in Mailman for which no patch is available"
My analysis is:
1. The problem is not obviously due to any bug in Mailman
2. The problem is more likely due to an IP routing problem which periodically afflicts the server and its ability to reach the MTAs for the mail domains addressed by the outgoing messages
3. The MTA is accepting the outgoing messages from Mailman and then finding it has problems of its own in delivering mail which are unrelated to Mailman as the origin of the messages
But I have to concede I know nothing about Exim 4.20. I know even less about CPanel.
Any thoughts or anatomically feasible suggestions welcome.
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Richard Barrett http://www.openinfo.co.uk
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