Folks, I'm using postfix/cyrus/sasl and it seems to be working for some messages, but I'm building up one huge queue and am not sure why! In the maillog I see a lot of these F2CF07364D 2075 Mon Apr 23 08:56:46 [EMAIL PROTECTED] (temporary failure) [EMAIL PROTECTED] F2C467368E 2123 Mon Apr 23 09:52:22 [EMAIL PROTECTED] (temporary failure) [EMAIL PROTECTED] The problem seems to be with the cyrus delivery, so in the /etc/postfix/master.cf I have cyrus unix - n n - - pipe flags=R user=cyrus argv=/usr/cyrus/bin/deliver -e -m ${extension} ${user} I'm not seeing any problems reported in /var/log/imapd.log so can anyone offer suggestions as to what's wrong, what I can do to help debugging, what more information is needed etc etc I ask as in about 18 hours I've built up a queue of 600 messages!! Having managed to get this far I'd hate to have to turn it all off again and go back to sendmail :( david