Hi, I've installed a ubuntu server with ispconfig (very useful software) and I'm amazed seeing some mails dissapear. This is the log: ----mail.log ---- Nov 20 23:58:45 correos postfix/pickup: 7832C6ED05A: uid=10027 from=<stig> Nov 20 23:58:45 correos postfix/cleanup: 7832C6ED05A: message-id=<20071121035845.7832C6ED05A@XXXX.org> Nov 20 23:58:45 correos postfix/qmgr: 7832C6ED05A: from=<stig@XXXX.org>, size=366, nrcpt=1 (queue active) Nov 20 23:58:45 correos postfix/smtpd: disconnect from unknown[126.96.36.199] Nov 20 23:58:46 correos postfix/local: 7832C6ED05A: to=<email@example.com>, relay=local, delay=1.2, delays=0.65/0/0/0.57, dsn=2.0.0, status=sent (delivered to command: /usr/bin/procmail -f-) Nov 20 23:58:46 correos postfix/qmgr: 7832C6ED05A: removed ----mail.log ---- Basically some mails aren't sent neither are returned to the sender. I've saw this in situations where the mail is rejected by the other smtp too. The questions are: How can I assure the delivery of the mail to dest or to sender? How can I capture the this mails to be saved some place to later review? Thanks!