Gnus Manual. Node: Reverse Scoring

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7.10: 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.

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