You can enter a list of junk mail senders from within the Junk Mail Filtering page of the Settings property sheet.
You can add a new junk mail sender by pressing the Add… button. The Enter Junk Mail Address dialog box is displayed.
Enter the e-mail address of the organization that sends you junk mail. You can use the wildcard character '*' to denote any number of characters. For example, *@junk*.com will represent addresses such as all@junkmovies.com, anyone@junkmail.com, postmaster@junkfood.com . Press OK to add the junk address to the list.