Paul Graham provides answer to spam emails (2002)

As Graham explains, “For most users, missing legitimate email is an order of magnitude worse than receiving spams, so a filter that yields false positives is like an acne cure that carries a risk of death to the patient.” Like many anti-spam crusaders, Graham himself started with an ordinary filter approach, looking for specific “bad words.” “Windows ate my homework, you know, like, buy an Apple”:

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Source: www.infoworld.com