I had created a temporary email address (mailto) link on one of my webpages to study a spammer's activities. Ran the page until I caught one then deleted the page. Left the email address active and received my first series spam and reported them all. There was no more email until the spammer got infected.
Since then the box filled with the email containing the W32.Swen.A@mm [Symantec], Swen [F-Secure],
W32/Swen@mm [McAfee], W32/Gibe-F [Sophos], Worm Swen.A virus apon reading the raw text of these emails.
I have reported all information to the ip isp owners and currently reviewing their access logs also.
I love how viruses can work for the good of tracking spam.