On Fri, 9 Jul 2010, [email protected] wrote:

} again, i'm pretty sure the filter does not train based on the from address

That is correct. Any good junk/spam filtering software ignores the from 
address, as there is nothing in that field that is useful for accurate 
spam filtering. In fact, any software that *does* use that address will 
actually increase the amount of false positives since many spammers use 
your own address [thankfully, we configured mail servers won't allow you 
to ever see that type of spam, but there are more poorly configured mail 
servers than well configured ones].

} this is pretty concrete:
} 
} 
<http://developer.apple.com/mac/library/samplecode/LSMSmartCategorizer/Introduction/Intro.html>

Yes, it is. Junk filtering in Mail.app is more than marketing speak. :)

/vjl/
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