Domain Name Email Address Block. Check the email header of the message and look for clues and codes that look something like the following. Free method as long as you already have email hosting eg.
Click IP Blocker under Security in cPanel. And I cant block them through my IncrediMail block bounce options again because of the constantly-changing domain names. Commonly called Realtime blacklist DNSBL or RBL.
In the left pane select Mail Accounts Block or allow.
Before you proceed you will need to know the IP address or domain name you want to block. Select the Blocked Senders tab. Under Safe Senders and Recipients enter the email address or domain you want to add and select. From your web host you can connect Gmail to your own domain name for free using SMTPPOP3 credentials dont worry if you have no idea what those terms mean yet.