Disable localhost relay Mail - Prevent Spamming

We can disable the local relay message by set following:

 

(1) Make sure the AntiRelay is Enable(Un-tick) >> Go to WHM >> Service Manager >> AntiRelay >> (make sure its Un-tick)

 

(2) Navigate to WHM >> Main >> Tweak Settings >> Initial default/catch-all forwarder destination.
  //Set this setting to Bounce / Fail.

 

(3) Force all mailbox's or email's users in the servers use SMTP Authentication.
 

Go to SSH and run following Command.

 

>> /usr/local/cpanel/bin/tailwatchd --disable=Cpanel::TailWatch::Antirelayd