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(gnus)Scoring Tips

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Scoring Tips
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"Crossposts"
     If you want to lower the score of crossposts, the line to match on
     is the `Xref' header.
          ("xref" (" talk.politics.misc:" -1000))

"Multiple crossposts"
     If you want to lower the score of articles that have been
     crossposted to more than, say, 3 groups:
          ("xref"
            ("[^:\n]+:[0-9]+ +[^:\n]+:[0-9]+ +[^:\n]+:[0-9]+"
             -1000 nil r))

"Matching on the body"
     This is generally not a very good idea--it takes a very long time.
     Gnus actually has to fetch each individual article from the
     server.  But you might want to anyway, I guess.  Even though there
     are three match keys (`Head', `Body' and `All'), you should choose
     one and stick with it in each score file.  If you use any two,
     each article will be fetched _twice_.  If you want to match a bit
     on the `Head' and a bit on the `Body', just use `All' for all the
     matches.

"Marking as read"
     You will probably want to mark articles that have scores below a
     certain number as read.  This is most easily achieved by putting
     the following in your `all.SCORE' file:
          ((mark -100))
     You may also consider doing something similar with `expunge'.

"Negated character classes"
     If you say stuff like `[^abcd]*', you may get unexpected results.
     That will match newlines, which might lead to, well, The Unknown.
     Say `[^abcd\n]*' instead.