Inbound spam filters, how do they work?

Our inbound spam filters have two layers:

1. Email that is so highly likely to be spam that it is not delivered. While this accounts for a LOT of email, it very rarely catches false positives. In the cases where false positives are reported, only a fraction of those are cases where our filters were excessive rather than the sending host did not follow accepted standards for email delivery.

2. Email we consider to be likely spam that didn't match in insanely high score will be delivered directly to your inbox. These will have a spam score in the headers, and you can create a filter on the server to move them to a spam folder if you wish. The choice of how to handle these is up to you.
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