E-mail disappears after receiving
I'm seeing a strange behavior on our Snow leopard seever.
At least one of our IMAP e-mail accounts has difficulty receiving mail from a few, specific senders. I will see an e-mail arrive (the Mac mail client software has the "1" appear in the inbox momentarily) but before it can be read it simply disappears. It's not in the trash or any other folder, and in checking the dovecot mail folders, it's not there either. But there are records in the mail log that support the fact the mail was delivered.
We do use a few mail rules for that account, but none of them would be applicable to cause the mail to disappear. Oddly enough, the two issues I have seen so far are from automatic mailings when passwords are needing to be reset (but two different companies).
Any suggestions on what might be happening or where to look?
Xserve, Mac OS X (10.6.7)