If you want to block unwanted emails from your email account, you can use SpamAssassin to create a 'blacklist'. Spam Assassin identifies and flags email as it arrives in your inbox.

1. Log into cPanel

2. C​lick the SpamAssassin icon, from within the Mail section

3. Click the Enable Spam Assassin button; Spam Assassin will start working immediately

4. ​Click the Go Back link near the bottom of the page

5. Click the Configure SpamAssassin button 
   
   

6. ​In the Blacklist From fields, enter any IP address or email address

7. Click the Save button