Craig R Hughes writes:

> So it's just because the GA could get away with setting it to 0.921
> -- in practice it's a clear sign of nonspam, and we should just fix
> it at -2.0, which I've done on both branches now.

Okay.  In HEAD, I made the rule less apt to be abused which is just as
well since we're hard-coding the score negatively.

> [craig@belphegore masses]$ fgrep FROM_AND_TO_SAME freqs
>       3574 2877 697 FROM_AND_TO_SAME
> 
> So it's not a bad rule -- occurs 5 times as frequently in spam as nonspam.
> 
> FROM_AND_TO_SAME is triggered in 0.2% of the false positives in the corpus
> FROM_AND_TO_SAME is triggered in 3.1% of the false negatives in the corpus
> 
> which makes the score the GA calculated make perfect sense.

Okay, as you probably already noticed, I removed FROM_AND_TO_SAME
earlier this morning (bug 456).  Let me reopen that bug and I'll see
if I can find a way to improve the rule before I add it back.

For me, only 42% of the hits are spam although I'll grant you that
it's not part of any false positives, so I'll add it back either way.

Dan

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