Which is a real shame. It would be very nice to assume that a domain
without an MX record isn't an email domain. Too late for A records, but for
AAAA records....
Believe me, I tried when they were working on 5321, but was roundly
shouted down, evidently because the handful of existing MTAs on
IPv6 make it "too late" to change.
R's,
John
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