[MagicalTux]

I think it's just a virus...
Viruses are making "nice looking" From email addresses by seeking parts on the user hard drive. Scanning HTML files in Browser cache for example. If someone infected has visited the Graal Online website before, it's possible that a webpage with a @graalonline.com address is in his browser cache.
The virus will make an email address from that, put a message, and send it to randomly found email addresses.

Anyway if you receive a .exe, .pif etc... file by mail, *never open it* ! Even if it comes from microsoft, graalonline or whatever.