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The Spam Superhighway What's "Port 25," and what does it have to do with Internet junk mail? By Chris Wilson A set of guidelines, published last week, for how to crack down on spam e-mail recommends that Internet service providers block outgoing traffic from customers on "Port 25," a major conduit for unwanted e-mail. (Read the guidelines here.) What is Port 25, anyway? The virtual pathway that most e-mail traffic follows when it travels from your computer to a server. Because there are so many different kinds of information being transferred on the Internet—Web pages, e-mail, and database re