Please help! Can not find solution for my problem... I have installed CentOS 5.2 and ISPConfig 220.127.116.11.
I am trying to send mail to my server and in my server log i found the following:
Apr 2 10:16:34 localhost postfix/pipe: C3075DC0391: to=<email@example.com>, relay=maildrop, delay=0.04, delays=0.01/0.01/0/0.02, dsn=5.1.1, status=bounced (user unknown. Command output: Invalid
Apr 2 10:16:34 localhost postfix/cleanup: CC52EDC0390: message-id=<20090402071634.CC52EDC0390@localhost.localdomain>
Apr 2 10:16:34 localhost postfix/bounce: C3075DC0391: sender non-delivery notification: CC52EDC0390
Apr 2 10:16:34 localhost postfix/qmgr: C3075DC0391: removed