After the upgrade from 3.0.1 to 3.0.3 the delivery of local emails does not work anymore. The rest (forwards, etc.) work without any problems. I have the following message in my log files: Dec 9 16:35:13 shared postfix/pipe: 0FBBF124843F: to=<[email protected]>, relay=maildrop, delay=0.16, delays=0.07/0.02/0/0.08, dsn=5.1.1, status=bounced (user unknown. Command output: Invalid user specified. ) When I check in the MySQL database then the domian is in mail_domain and the email address exists in mail_user. Connecting to the mailbox over IMAP or POP3 works as well. Does anybody have some more ideas? The System is a CentOS 5.5 Linux.