That's true. However the imapd or popd delivered with Linux RH are only simple daemons. I use the qpopper which gives you a lot of configuration options, like flush the mail from the server after transfer, before and without a quit. I use this for modem dialin. Sometimes my client fetches the mails from the server (>5MB) and the transfer breaks. So all the mail are fetched again with the normal pop3d, but not with the qpopper daemon. Ok, there's a risk, but that's not the problem.
A concrete example: when mail is retrieved via POP3, and deleted from the server, the server will only actually delete the messages upon receipt of a QUIT command. If the client retrieves some messages, marks them for deletion, then closes the connection without issuing a QUIT command, the messages will be retained, and hence retrieved again on the next attempt.
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