On Sat, 29 Mar 2008, John Levine wrote:
Getting rid of the AAAA fallback flips the default to be in line with
reality -- most hosts don't want to receive mail directly, so if
you're one of the minority that actually does, you affirmatively
publish an MX to say so.
I agree that this is the right thing to do in an ideal world.
However there's a lot of old running code out there that implements the
AAAA fallback. Is IPv6 still enough of a toy that the stability of its
specifications doesn't matter?
Tony (in two minds).
--
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