Microsoft Research wrote a paper about this - basically it helps filter out the false positives. https://www.microsoft.com/en-us/research/wp-content/uploads/20

Microsoft Research wrote a paper about this - basically it helps filter out the false positives. https://www.microsoft.com/en-us/research/wp-content/uploads/2016/02/WhyFromNigeria.pdf https://www.microsoft.com/en-us/research/wp-content/uploads/... [PDF]