Class 3 (`full` DKIM) - Signed (DKIM) mail with replay/destination
protection. Here, the destination is signed (or just a hash of the
destination, possibly using hash tree, for privacy and efficiency).
Mailing lists and other forwarding services will need special
DKIM-enhancements to provide this DKIM service.
Eeewww. When the SPF crowd said that every mail forwarder in the world
would have to be upgraded to rewrite the envelope to work around a flaw in
SPF's design, we all threw rotten tomatoes at them.
Surely you do not want to send DKIM down the same road.
Regards,
John Levine, johnl(_at_)iecc(_dot_)com, Primary Perpetrator of "The Internet
for Dummies",
Information Superhighwayman wanna-be, http://iecc.com/johnl, Mayor
"I dropped the toothpaste", said Tom, crestfallenly.
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