Hi guys, I'm setting up a Mail Server, on Centos 4.4. Initial configuration is in accordance with the perfect setup article (which have been extremely useful). I'm running my nameserver on 1 domain (domain1), and used ISPconfig to setup to run mail services on another domain (domain2). I am able to login via POP, however, SMTP didn't work. I also tried sending an email from Google Mail to my email address on domain2, i got the following error from the logs. Can anyone point me in the direction as to where i should look at to fix the 2 problems? I've checked the MX records, nameserver resolution via dig, everything looks correct and points to the right IP address. I have also enabled the *maildir* option in ISPConfig. Let me know if you need further information. *** I managed to fixed the issue **