To manage the blocked senders list
On the Tools menu, point to Message Rules, and then click
Block Senders List.

To remove a sender or domain from the list, select the name
and click Remove.

To change a sender's name or domain on the list, select the
name and click Modify. Make your changes in the dialog box
and click OK.

To add a new sender or domain to the list, click Add. Enter
the information in the dialog box and click OK.

Click OK in the Message Rules dialog box to apply rules
that have been added or changed.