Raymond Norton wrote: >> 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. > The last thing that a POP3 client does after downloading email is to tell the server, I got this email, don't send it to me again. If your connection to the POP3 server gets terminated prior to the client closing the connection gracefully, they will download the same messages again next time they connect to the server. This behavior can be caused by network issues or POP3 clients behaving poorly. Josh