Message Hygiene

About 95 percent of all messages sent across the Internet are some kind of spam—commercial messages from malicious organizations or infected computers. Well-known spam messages are for illegal Viagra pills, penis enlargement, and imitation Rolex watches, or are solicitations from Nigerian banks or people in Hong Kong who want to offer you millions of dollars if only you’d give them your bank account password.

But not all messages are spam. There’s a second category of bulk mail, which are advertisements whose sponsors have drawn your email address from a distribution list that you might once have subscribed to but have ...

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