Step 1: On the Tools menu, click Options to open the Options dialog box.
Step 2: On the Preferences tab, under E-mail, click Junk E-mail to open the Junk E-mail Options dialog box.
Step 3: Click the Blocked Senders tab.
Step 4: Click Add.
Step 5: In the Enter an e-mail address or Internet domain name to be added to the list box, enter the name or address that you want to add.
Step 6: Click OK.