Anyway, probably just a spoof. Along with a zipped archive containing...something, I'm not going to check what, is the following message:
Mail server report.
Our firewall determined the e-mails containing worm copies are being sent from your computer.
Nowadays it happens from many computers, because this is a new virus type (Network Worms).
Using the new bug in the Windows, these viruses infect the computer unnoticeably.
After the penetrating into the computer the virus harvests all the e-mail addresses and sends the copies of itself to these e-mail addresses
Please install updates for worm elimination and your computer restoring.
Customers support service.
Honesty--it's the best policy!
("Using the new bug in the Windows"?)