>I expect they're probably > downloading the same message over and over again with POP, which would > be a whole different problem. We are using dovecot for Imap and pop3. Is there anything that can be configured to prevent the duplicates? In the past I have found if a user's pop3 server was set up as mail.domain.com, and later changed to an IP, all messages that are stored on the server would come down again. Nothing has been changed, so I'm not sure why the problem has cropped up.