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Spam Assassin

You can set email rule, such as blacklist and whitelist email addressess and domains with Spam Assassin.

To blacklist email addresses or domains,
1) Open Cpanel >Spam Assassin >Configure Spam Assassin
2) Look for blacklist_from
3) Add addresses or domains to each text field
ie) admin@website.com
This will block this email address.

*@website.com
This will block this entire domain.