That is true, but it's also true that the standards track version of
EAI is fairly different from the experimental version, mostly by
leaving out a feature that didn't work in the field (downgrading.)
Does that mean going with "experimental" first was a good choice or bad
choice for them?
For EAI it was the right choice. They invented a brand new two-part
address (Unicode and ASCII) and didn't know whether it would work in
practice. The experiment showed that it didn't so we took it out of the
standards track EAI.
For ARC I see two unknowns, a minor one about how to do algorithm
rotation, and a major one whether its audit trail will be adequate to do
un-DMARC-ing. For that last question I expect there could be one answer
for mail systems large enough to have their own models of where all the
mail comes from and a different answer for smaller systems.
Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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