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In [SpamAssassin] 2.x, the scores are assigned using a genetic algorithm (GA).  In [SpamAssassin] 3.x, the scores are assigned using a neural network trained with error backpropagationback propagation (\["Perceptron"\]).  Both systems attempt to optimise the efficiency of the rules whichthat are run, in whileterms alsoof minimisingminimizing the number of false positives and false negatives. More information can be found on the 'Tests' page A list of the rules and their assigned scores is at \[http://spamassassin.apache.org/tests.html tests\]. Note that you can help this system by providing statistics on your mail spool via [NightlyMassCheck] and [RescoreMassCheck].

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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