I think any future e-mail system should provide a strong, unforgeable
statement (using the usual cryptographic techniques) on each e-mail.
The statement should read:
The sender of this e-mail is authenticated.
Or:
The sender of this e-mail is not authenticated.
End-users can then choose what to do with mail from unauthenticated
senders. I don't see how this hurts anyone's freedom of expression.
I don't think we should force all e-mail senders to be authenticated,
but we should force the existence (or lack) of authentication to be
clearly visible.
--
David.
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