- Login to your cPanel account.
www.yourdomainname.com/cpanel
 - Search for 'Spam Filters' under the EMAIL section.

 - Inside the Spam Filters, click on 'Show Additional Configuratuons' to expand the advanced setting.

 - Under the advanced setting, select 'Edit Spam Blacklist Settings'.

 - Under the 'Edit Spam Blacklist Settings', click 'Add A New "blacklist_from" Item'

 - Insert the email that you wish to blacklist and click on 'Update Blacklist' button.

 
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