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They have autoreponders set up on a couple of forwarding email addresses (no actual mailbox associated with these addresses). The default account is setup with :fail: so that it doesn't act as a catch-all.
The default account, which they don't use for anything, is filled up with delivery failure messages. It looks like when they get a spam message with a bad from address sent to one of their forwarding accounts, the autoresponder sends a message to that bad address, and they get a delivery failure message sent to their default account sometime later.
Can anyone tell me the best way to manage this problem. We really don't need anything going to their default account, so setting up that account to ignore all messages would be the easiest way to avoid thousands of delivery failures building up there.
Turning off the auto-responder would cut all that out, wouldn't it? Also make sure that they're discarding catch all mail.