Everyone sending mail to webmaster@postforcash is subject to receive you_are_fat!.txt.pif . His computer is infected with the virus
http://www.google.com/search?q=you_a...=Google+Search and I think he does not know about it yet. I tried to reach him unsuccessfully. If you receive mail form him, make sure you open no attachement.
It's just bad enough when you get infected and that your computer goes and piss off anyone, so be carefull.
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wiZd0m