7.11 Reverse Scoring

If you want to keep just articles that have `Sex with Emacs' in the subject header, and expunge all other articles, you could put something like this in your score file:

     (("subject"
       ("Sex with Emacs" 2))
      (mark 1)
      (expunge 1))

So, you raise all articles that match `Sex with Emacs' and mark the rest as read, and expunge them to boot.