If you have e-mail, you have spam--that annoying electronic junk mail that jams your inbox, sometimes makes you blush, and takes a lot of the fun out of your online experience. Spam wastes thousands of hours and costs you, the recipient of the stuff you don't want, thousands of dollars in increased costs that your Internet service provider eventually passes along to you. In fact, a European survey in 2001 revealed that spam costs about $9.4 billion...