"Dear Homeowner" spam

[Jack Gostl]

I've been getting a bunch of spam hawking mortgage rates. You may have seen 
it, it starts with "Dear Homeowner."   Tthe only test that flags this 
message is "BAYES_50", for all practical purposes a score of 0.

What concerns me the most is that this triggers "autolearn=ham".  I later 
feed this back through sa-learn as spam, but what I'm wondering is whether 
this undoes the damage to the Bayes databases caused by the autolearn=ham.

I'm considering lowering the autolearn threshhold to less than zero. I 
wonder if anyone else has any thoughts on this as well.

Thanks

Jack