Login to Direct Admin console and click on your target domain.

Click on Spamassassin Setup as highlighted below:

Scroll down and fill in the email under Email Blacklist section. Enter the full list of emails which you intended to blacklist as seen in the example below:

NOTE: To block any incoming email from the specific domain example : blacklistdomain.com please insert the format *@blacklistdomain.com

Press the Save button to confirm the final changes.
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