Postfix Error - Relay Access Denied

Hey guys, i'm kinda new to the virtualmin environment, and i've run into this problem with Postfix where I can receive e-mail fine... but I can't seem to send any mail.... I'm using Windows Mail... and everytime i try to send an email i get this error message...

The message could not be sent. The authentication setting might not be correct for your outgoing e-mail [SMTP] server. For help solving this problem, go to Help, search for "Troubleshoot Windows Mail", and read the "I'm having problems sending e-mail" section. If you need help determining the proper server settings, please contact your e-mail service provider.

The rejected e-mail address was 'cadillacrick@gmail.com'. Subject 'Re: TEST feb 19', Account: '192.168.2.200', Server: '192.168.2.200', Protocol: SMTP, Server Response: '554 5.7.1 cadillacrick@gmail.com: Relay access denied', Port: 25, Secure(SSL): Yes, Server Error: 554, Error Number: 0x800CCC79

My Postfix main.cf is as follows

See /usr/share/postfix/main.cf.dist for a commented, more complete version Debian specific: Specifying a file name will cause the first line of that file to be used as the name. The Debian default is /etc/mailname. myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no

appending .domain is the MUA's job.

append_dot_mydomain = no

Uncomment the next line to generate "delayed mail" warnings delay_warning_time = 4h

readme_directory = no

TLS parameters

smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for information on enabling SSL in the smtp client.

alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = vorlon.gateway.2wire.net,canismajor.ca,saturnvbbs.net,localhost,localhost.ca mailbox_size_limit = 0 recipient_delimiter = + virtual_alias_maps = hash:/etc/postfix/virtual sender_bcc_maps = hash:/etc/postfix/bcc mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME home_mailbox = Maildir/ smtpd_sasl_auth_enable = yes broken_sasl_auth_clients = yes smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination myhostname = canismajor.ca

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128

Any help would be greatly appreciated !!

Rick "ckoi"