Being a former spammer I would say find a bayesian filter you can tweek. They are a little out of date but they are pretty effective at spotting spam. You are bound at some point to get a false positive but there is not much you can do about that. But deffinetly make a white list that will help with less false positives.
If you can train your filter to recognize the probabilitys of an emial being spam and keep a whitelist you should not have to big a problem, LOL unless your getting 2500 spams (that sucks).
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