I'm not sure, but Dennis's computer may or may not have a virus. I've heard of people hacking into ISP servers with programs that "observe" email traffic. You might be wary of opening some junk mail, but you wouldn't think twice if it was someone you knew. Dennis didn't email anyone; someone emailed you using his email address. How they got into his ISP is unknown, but resident virus software caught it before it was sent out to you. This may not be exactly what has happened, but Dennis certainly didn't send those emails. I just talked to him and he's checking into it presently, so if you don't hear from him online, that's what he's doing.