Postfix TLS authentication not enabled

Frank Astin asked:

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

When I telnet 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.

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