- 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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