Hello I am getting a relay denied message when trying to send mail from an external host through my ISPConfig 18.104.22.168 server to my gmail account. 554 5.7.1 <[email protected]>: Relay access denied I set up the client to smtp authenticate but still does not work. I can only send email to domains hosted locally on the server. I read all the posts relating to this but I have not seen any posts with these types of files in the /etc/postifx directory: mysql-virtual_client.cf mysql-virtual_client.cf~ mysql-virtual_domains.cf mysql-virtual_domains.cf~ mysql-virtual_email2email.cf mysql-virtual_email2email.cf~ mysql-virtual_forwardings.cf mysql-virtual_forwardings.cf~ mysql-virtual_mailboxes.cf mysql-virtual_mailboxes.cf~ mysql-virtual_recipient.cf mysql-virtual_recipient.cf~ mysql-virtual_relaydomains.cf mysql-virtual_relaydomains.cf~ mysql-virtual_relayrecipientmaps.cf mysql-virtual_relayrecipientmaps.cf~ mysql-virtual_sender.cf mysql-virtual_sender.cf~ mysql-virtual_transports.cf mysql-virtual_transports.cf~ I set this server up according the Perfect Server for Fedora Core 10. I guess Postifx reads a lot of settings in the database and I would suppose that smtp authentication is set in the database as well. If this is the case then I should be able to enable this setting in the control panel rather than editing the mail.cf or master.cf files. So the question is, how to I enable Postfix to relay smtp authenticated users without touching the /etc/postfix directory?