I had Klez about a month ago and this sounds exactly like it. I was getting dozens of returned e-mails addressed to people I don't know, some people here in this forum, but I've never ever e-mailed to, and some of my own relatives and friends. It's a nasty one. If anyone does get infected by it, the fix is on the Symantec site and it's easy to clean out. As soon as I knew what was going on, I went out and bought Norton immediately. I just wish the people who write these things would stop. I don't understand what they think they get from it. If they have the knowledge to write programs that do damage, why can't they put their knowledge to constructive projects, like inventing games or writing legitimate software? Sheesh! Melanie