They seek to distinguish important differences in processing for what is
claimed to be the /same/ protocol.
Except really they don't.
Except when they do. I'm thinking, f'rinstance, that there is a bunch of
code in things like Spamassassin that looks at headers and switches out to
routines to do stuff with them. There is nothing in Spamassassin that
needs to care whether a DKIM signature is v=1 or v=2, that's all inside
the DKIM library. If it passes a v=2 signature to a library that only
knows about v=1, the library will say it's invalid, which isn't ideal but
John Levine, johnl(_at_)iecc(_dot_)com, Primary Perpetrator of "The Internet for
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