Challenge-response e-mail systems work on a simple premise: Good e-mail comes from people you know, and bad e-mail from people you don’t know.

There are some issues with that idea — someone you don’t know may send you a legitimate e-mail — but the notion is innocent enough. Real humans with whom you interact on a regular basis will send e-mail you definitely want to see and read. E-mail that is generated by machines and sent to millions of recipients, you can do without.

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