Postfix TLS authentication not enabled

Frank Astin asked:

I’ve set up a mail server according to this guide.

When I telnet mydomain.com 25 and use the AUTH command it returns:

Error: authentication not enabled

Trying to login via outlook returns an unknown error and when I send an e-mail to an adress I get an relay access denied error.

However, mxtoolbox tells me everything is set up ok.

My answer:


You’re using the wrong port.

Authenticated outgoing email is on port 587, not port 25.


View the full question and answer on Server Fault.

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.