To block spam, companies often relied on keyword ‘detection’, and drew up a list of keywords that commonly appeared in most of the spam email. This list would often include keywords such as ‘viagra’ or ‘bank’. However, this method often blocked genuine email and adding more keywords simply resulted in more false positives which in turn blocked legitimate email. But spammers became smarter too, and they addressed keyword blocking by replacing keywords such as ‘viagra’ to ‘v1agra...
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