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I get no spam and lose no wanted messages for $0 per month running all free software.
I'm not sure how big your company is but it might make more sense to set up your own spam filtering gateway. It only takes an old PC and a day.
The "learning" filters you're talking about are called Bayesian filters. There are an abundance of them. I actually don't use them anymore because everything was being caught before it even got to them.
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