How to blacklist email in Professional Spam Filter?

Any sender on this list will automatically have their email rejected and sent back with a 5## SMTP error.

1. Log into your Spamfilter dashboard.
    
2. 
    

   Click on the Sender blacklist icon.

    
3. 
    

   Find the Sender blacklist section and enter either a single domain name ([email protected]), an entire domain (example.com) or an entire TLD (*.com) to blacklist in the Sender field.

    
4. 
    

   Click on the Add button.