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Comment: Added wiki link to Perceptron

How are the scores assigned?

Wiki Markup
In [SpamAssassin] 2.x, the scores are assigned using a genetic algorithm (GA).  In [SpamAssassin] 3.x, the scores are assigned using
a perceptron 
 a \["Perceptron"\] learner.  Both systems attempt to optimise the efficiency of the rules which are run, while also minimising the number of false positives and false negatives. More information can be found on the 'Tests' page. Note that you can help this system by providing statistics on your mail spool.

Some DNS blacklist rules are distributed with scores of 0. These generally request or require payment, and as such are disabled by default. Feel free to enable the lookups, if you've paid for them.

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