I love this part - I wonder if the filter they found was SA?  ;^)

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For most of this time, the company policy on spam filtering was not to
filter it out at all, because all the filters they tried had too high a
false-positive rate. (I.e., they were rejecting too many valid messages as
spam.) You can see that in late 2003, the blue dot density diminished
considerably. That's when mail administrators found a filter whose
false-positive rate was low enough to be acceptable. 

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