How 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.

    Click on the Sender blacklist icon.


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


    Click on the Add button.

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