virus warning

Hi
Recently I receive massive mail attack. This attack comes from some 
postgresql mailing list users. All send-to adresses are taken from users 
mailboxes which contain postgresql posts. Currently I found two kinds of 
viruses:
1. Empty post with "Undelivered message to..." body
2. Microsoft "Dear Customer... " based on www.microsoft.com design.
Both mails contains some .exe attachement.

Regards,
Tomasz Myrta