If your ISP gave you any of the mail headers from the SPAM, I would also want to see those as well. Many worms/viruses (especially mail flooders), spoof the sender of the mail to be from people harvested from the infected persons computer. I can't tell you how many times I have had to walk irate, but clueless, admins through the process of examining the mail headers closer to show that they were forged...

Anyway, post them here, with as little changed as possible (I understand if you want to hide your username) and I will have a look at them...

/nebulus