Rather than devise such a new scheme, think about why SenderID, SPF,
DomainKeys and plain old S/MIME have not taken off. These are all open
standards, free to implement and thus should be attractive.
Yet they are not implemented. Proving who the sender is would be huge
-- it would allow for prosecution for illegal spamming; it would alert a
user whose computer is infected and used as a bot, and it will allow for
blacklisting (reputation loss).
So, before you create a new parallel mail system that costs money and
has cross payment systems, etc., why not get these standards implement
fully?
Methinks it's not technology alone that's the problem.
David
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