Solved ERROR: Message not send Server Replied Bad sequence of commands 503 5.5.1:Authentication not enabled

Description: In this we explain ERROR:Message not send Server Replied Bad sequence of commands 503 5.5.1:Authentication not enabled in installing a squirrelmail client with Postfix server.

To solve the error you need to follow the simple step.

Solution:

Open the config.php file which is located in squirrelmail in your favorite editor, we use vim:

 vim /etc/squirrelmail/config.php

You see the line stmp_auth_mech there.

change smtp_auth_mech to none if it is login.

And this will solve the issue.

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