Not sure which virus it is but someone out there who is a regular reader of the board has an infected machine. When the infection first took place, the virus harvests e-mail addresses from that persons e-mail address book, web browser cache, etc. It has it's own SMTP engine and it starts sending out e-mails with all of our addresses "Spoofed" as the sender. I'll bet I have received one of these viruses from dang near everyone that posts here, supposedly. That could be an over statement but you catch my drift.

It is very annoying but there is not much you can do about it besides making sure you are runnin anti-virus software AND keeping your anti virus definitions up to date.

Cheers!
Bill