Yes, we understand that those logs are normal. And indeed we have a list called "mailman"... Could that be confusing the software somewhere??
The thing is that we have a pretty convoluted setup for handling mailing lists messages, but it's always the same for all messages. That's why we don't understand why only a small fraction of all the moderation messages get misdelivered at random times for random lists.
I think what Dan was getting at is: Are there any other logs that would show us how a message that:
a) was accepted by Postfix on the Mailman server for local delivery to list-owner@lists.caltech.edu;
b) was therefore piped into the Mailman software;
c) came out of that processing as needing to be now delivered (remotely) to mailman@caltech.edu, rather than the actual address of the owner of the original list?
Or maybe we can turn on more verbose logging or something?
Thanks.
PS: Not to confuse things (because it doesn't apply in my example), but what happens when a list has no owner and a message is sent to list-owner?