Here are a couple items that may be improvements to future versions of MailWasher Pro;

-An even easier way to identify Friend or Foe and selecting entire domain as Friend or Foe: How about check boxes? I know it would ad columns, but with the mass of email to deal with, it may be easier than right-clicking or + / -. Just a thought.
-Ability to change the color of Friend or Foe. Green is ok for Friend, but I would like to make the Foe list RED or Black with white text. Possible?
-Ability to read your contact list in Outlook to automatically create Friend list.

You can add entire domains to the blacklist, just right-click on a message to get that option. Keep in mind that most messages have forged addresses and do not come from where they say they do. Don't block an innocent domain and miss good messages.