Adding Name to Block Senders List in Outlook

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

 Notes 

• You can quickly add a name to the Blocked Senders List by right-clicking the junk e-mail message, and then, on the shortcut menu, pointing to Junk E-mail and clicking Add Sender to Blocked Senders List on the shortcut menu.
• If you have existing lists of names and addresses that you want to block, you can import the information into Microsoft Office Outlook 2003 by saving the list as a text (.txt) file with one entry per line, and then importing the list.
• If you are using a Microsoft Exchange Server e-mail account and working online, you must be using Microsoft Exchange Server 2003 or later. If you do not know what version of Exchange server your e-mail account is using, contact your Exchange administrator.
• To remove a name from the Blocked Senders List, in the Blocked Senders tab, click the name you want to remove from the list, and then click Remove.

http://office.microsoft.com/en-us/outlook-help/add-a-name-to-the-blocked-senders-list-HP005243402.aspx