How to add a sender’s domain to the Blocked Senders list?

Step 1: Right-click the email message that was sent from a domain that you want to block, point to Junk E-mail, and then select Junk E-mail Options.

Step 2: Select the Blocked Senders tab.

Step 3: Click Add.

Step 4: Type the domain name that you want to block.

Step 5: Click OK.