NOQUEUE: reject: RCPT from XXXX Relay access denied

Hey all

I’ve had problems with Postfix ever since installing Virtualmin on a fresh Centos 5.4 server
The original problem was user error (Firewall blocked outgoing smtp), but this problem existed as well, but I didn’t think to check if it still did
When an email is sent to an account on the server, it bounces back, with the following error

Nov 19 18:23:42 server1 postfix/smtpd[14631]: connect from mail-bw0-f213.google.com[209.85.218.213]

Nov 19 18:23:42 server1 postfix/smtpd[14631]: NOQUEUE: reject: RCPT from mail-bw0-f213.google.com[209.85.218.213]: 554 5.7.1 adam@uoforums.com: Relay access denied; from=adam@eogamer.com to=adam@uoforums.com proto=ESMTP helo=<mail-bw0-f213.google.com>

Nov 19 18:23:42 server1 postfix/smtpd[14631]: disconnect from mail-bw0-f213.google.com[209.85.218.213]

I’ve searched google to no avail and I can’t for the live of me figure out what’s causing it

Any help would be greatly appreciated

Adam