A few weeks ago I wrote on how spammers are hijacking your PC to send spam. But they don’t necessarily need to get into your computer to do it — they can spoof your e-mail address, forging not only your address but also your e-mail server.

How to avoid this? Follow a few simple

Declan McCullagh writes that some of today’s new spam-blocking programs may actually wreak e-mail havoc. These programs use “challenge-response” technology, which requires human non-spammers to click a link or type a word in a box to make sure their e-mail gets to you. Apparently, much of this software is poorly designed, forcing individuals well-known