And it is easy enough to do "F2F" in a manner that does not break the
The system sending the mail signs it. That's one of the great
advantages of DKIM, the signature doesn't have to match other header
addresses such as To: or From:.
A user whose domain publishes adsp=discard couldn't successfully use
such a service, but that's a limitation of ADSP, not of F2F mail or of
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