Step 1: Login to the cPanel account.
Step 2: Click the 'BoxTrapper' icon inside 'Email' section.
Step 3: Box Trapper protects your inbox from spam by requiring all email senders who aren’t on your Whitelist, to reply to a verification email before you can receive their mail.
Step 4: To enable BoxTrapper for an email address, click "Manage" followed by the email account.
Step 5: Click on the "Enable" button and BoxTrapper has now been enabled for this email address. Click "Go Back".
Step 6: Next you’ll want to configure your BoxTrapper settings. Click the "Configure Settings" link.
Step 7: Next click "Edit Confirmation Messages" and edit the standard confirmation messages already setup for you.
Step 8: Click "Edit White/Black/Ignore Lists". Here you can add addresses to your Whitelist, Blacklist, and Ignore list.
Step 9: Once you have BoxTrapper setup the way you want, you’ll notice a huge reduction in spam.