Setting correct email address for users

Hi all,

I'm new to this list and newbie of roundcube.

How do I set all users email address with domain other than my server's hostname? I noticed all users sent email using roundcube have different domain name after @ such as user@webmail.mydomain.org. My hostname is webmail.mydomain.org. How do i change this to user@mydomain.org. I assumed it grabs my hostname and use it for users' email addresses. My server: Mandriva 2006 dbmail-2.2.5 postfix

thanks in advance.

zamri Linux System Administrator Kolej ShahPutra Kuantan Pahang Malaysia Tel : 609.573.777.7 ext 119 web : http://muhdzamri.blogspot.com