[computerworks]

...before you drive over and bop Jim....he may not be the one sending you the mail.
Some new and very prolific viruses infect a computer, scan and "digest" all the e-mail addresses ON THAT COMPUTER...and then begin to send out infected messages using random e-mail addresses for the sender and the recipient.

In this case, a computer that had HIS and YOUR e-mail address could be the infected culprit. A message like that can be traced (with some difficulty).

Just keep your Norton current and updated and delete any detected attachments...don't OPEN them.