In <01be01c30e0a$4cdc1760$0201a8c0(_at_)DXHIRX1> "Ken Hirsch"
<kenhirsch(_at_)myself(_dot_)com> writes:
Every SMTP message carries a practically unforgeable token identifying
and authenticating the previous hop ISP.
Well, if you really consider message headers unforgeable, you can skip the
cryptographic authentication!
As quoted above, only the IP address of the previous hop is
practically unforgeable. Most other headers can be trivially forged.
-wayne
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