Your problems are already solved. Read about anonymous remailers and
nym servers (http://en.wikipedia.org/wiki/Anonymous_remailer
What you need is a nym server account, and for you as a Windows user
the most efficient way to interact with nym servers is a local proxy
server called OmniMix (http://www.danner-net.de/om.htm), which also
processed this message sent by my standard mail & news client.