Posted: May 14th, 2016
Email abuse is easily mitigated with cPanel's WHM interface. Here are five steps to take appropriate preventative measures to prevent abuse:
1) Enable WHM's SMTP restrictions
2) Preventing the 'nobody system user' from sending email
3) Enable suPHP and suExec or mod_ruid2
4) Configure the max hourly email setting
5) Configure high failure rate protection
Implementing all five of these strategies will provide the most optimal outcome