Packages in CentOS

[motokochan]

First, check the mail log. If there are reasons IMAP is dropping the connection, it will be logged.

Next, edit /etc/postfix/master.conf and set the chroot section to "n" instead of "-". You should do it for at least the smtp service, but I believe one other might also need to be disabled for transport to work. Also, don't forget to set up /etc/aliases and run "newaliases" or you'll have errors when the smtpd service starts.

Edit: You need to set both smtp services (inet and unix type) to non-chroot. This should fix the queue from becoming backed up.