[gregschlom]

> if we have cryptographic proof that certain emails are genuine, that shoots down a big counter-argument of "what if some emails are planted".

Huh, no? I don't see how that follows logically.

If we have cryptographic proof that all email are genuine, then yes.

Right now we already know that some (most?) email are genuine. The question is whether or not the attacker, who was obviously motivated by political purposes, also inserted some fakes in the lot. (Although to me that seems highly unlikely)

[dooglius]

Good point, but we know specifically which emails are genuine, and which may or may not be. Any particular email that isn't signed is questionable, but we can say for any given email whether or not it might be a fake.