So would I but there's way too many SPF-only DMARC users and it would be a 
breaking change.

So we have SPF-only DMARC users, and DKIM-only DMARC users, and they could 
easily come to opposite conclusions about the same message. Maybe it’s not 
interoperability in the same sense as disjoint cipher suites, but this seems 
like an interoperability problem to me.

Um, this would be a good time to reread RFC 7489,

Regards,
John Levine, [email protected], Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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