[ietf-smtp] DANE penetration for MTA/MTA interactions

DANE has been around for a long time.  I'm curious how much actual use 
it gets for email transport.
Is there any sort of subjective or objective assessment of percent of 
sites or traffic using it?
Not just DANE records published, but DANE /use/.

d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net

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