I received some 'returned' mails with a similiar structure, some short message that says that the rest of the message has been attached in a text file.

If you examine the said so-called textfile, it becomes obvious that it is really an exe file (name.txt.exe).

The virus that's onboard is called W32.NovargA@mm (according to Norton)

One of the mails came from some 'izzy@racecgi.com'...