More Klez
The "Klez" virus is one of a family of viruses, the most prolific is called W32/Klez.h@MM, and appeared mid-April, 2002, and has been one of the most successful email-borne viruses of all time. While most virus outbreaks trail off within a few days of emergence, Klez is still increasing in prevalence eight weeks after its first appearance. It's hard to eradicate because it fakes the sender address of emails. This also means that many people will receive warnings about Klez for mail they never sent. Klez also infects and may damage files, and can distribute confidential information.You ain't got it (or if you do, the traffic you're seeing is unrelated). As I mentioned, Klez traffic is still growing 10-15% per week. Our per-day incidence has climbed above 200 messages, I expect this won't top out lower than 300-500 daily, if not more.
Headers should tell you where the actual origin was.