Originally Posted by rusty
I have a similar issue. I can send mail from the server using command line (telnet), however using Outlook I get relay access denied. I have Outlook set to use authentication (same settings as incoming mailserver). I receive mail just fine in Outlook.
Are you absolutely sure you checked the right option in Outlook? If so, what's in /etc/postfix/main.cf, and what's the output of
telnet localhost 25