I've just took a look on the exact POP-3 spec. There seems to be another problem: > ---------------------------------------------------- > +OK <98640940.1241005202@xxxxxxxxxxxxxxxx> imap.example.com Cyrus POP3 v2.3.13-Gentoo server ready > USER username > +OK Name is a valid mailbox > PASS passphrase > +OK Mailbox locked and ready > ... > RETR 2 > DELE 1 > DELE 2 > QUIT > ---------------------------------------------------- As far as I understood, a POP3 server must ALWAYS send a response (+OK or -ERR). But in my case the server does not response at all. Any hints why/how this can happen? I see this behaviour very often on the wire. Maybe it is worth mentioning that the client in this case is MS Exchange. Thanks and regards -stefan- ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html