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While a person can easily recognize spam, it is not easy for computers because they do not "understand" language. Spammers have also learned to defeat most content filters based on phrases and keywords. While you may see "free money" or "Viagra" on the screen, the email message may not even contain that phrase; instead, complex HTML code visually places those two words next to each other. Without a vision system, a computer cannot recognize this obvious phase therefore, all the methods above to categorize spam emails are essential.
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