A similar problem holds for secure email. I could digitally sign my outgoing email, but this wouldn’t do much to prevent forged messages in practice. A forged message would of course be unsigned, but unless unsigned messages were rare, nobody would be taken aback on seeing one. But if almost all messages were digitally signed, than an unsigned message would be rare enough to arouse suspicion, and might trigger a prominent warning from the user’s email program.
Is any application vendor interested in pushing this as a strategy? What if you could simply block all unauthenticated email and be assured being spam-free?
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