Require SMTP Authentication
For WHM version 11.30
By default, WHM uses POP before SMTP authentication. This means that when a user on a POP mail server authenticates a session, he will be allowed to send messages for 30 minutes without re-authenticating through SMTP.
While this method is secure, some administrators prefer to use SMTP authentication at all times. To require SMTP authentication, issue the following command as root in a terminal session:
/usr/local/cpanel/bin/tailwatchd --disable=Cpanel::TailWatch::Antirelayd

Cpanel.net
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