Actually, that's *STILL* impossible. As far as I am aware of, every single "attack when you open the message" virus/worm is dependent on the fact that certain mail programs confuse the concept of "reading the message text" and "executing/interpreting code provided by an attacker".
Unless you want to consider those stupid "forward this to everyone you know" hoaxes as a form of virus. Since so many people blindly follow the instructions, they are in effect acting as the operating system, executing the payload of the message.
I like to refer to these as "smart virii." They use human vectors to propagate, bypassing all anti-virus measures (other than, perhaps, Bayesian spam filters).
m5x
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