Change DNS in email headers with ISPConfig?

[sagor]

I'm not sure how, but somewhere during the ISPConfig install, or downloading/installing squirrelmail, I put in a dummy DNS name of www.xxx.com. Now that I'm managing to get some sites up and running, any mail sent out to my Gmail have a header with this dummy DNS name.

ie:
Message-ID: <1182.216.223.74.19.1209266459.squirrel@www.xxx.co m>

I'd like to clear it/reset it to the DNS name the site is now running under. How/where can I change this? Is it in ISPConfig somewhere, Postfix, Squirrelmail?

Thanks

[till]

Change the hostname in /etc/hostname and /etc/postfix/main.cf. Afterwards reboot your server.