Using this howto: http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-centos-5.3-x86_64 I am attempting to receive mail for another domain. More specifically, I'm trying to catch mail for a specific email address and forward that onto a gmail address. It works if I'm sending the email FROM my domain, but if I try to email for the address from gmail, I'll get a 550 rejected message back from google (saying that my mail server rejected the mail because of the recipient domain). I added the domain in the domains table in the mail database. What else should I be doing to make that work?