I have a theory that you will never, ever, have any reason to accept
mail from IPv6 networks, since everyone you want to hear from will
have an MTA or gateway on IPv4, but that is a separate argument.
Never's a long time. I think you might be right, but only because I
expect Internet governance to implode before 6 overtakes 4 as the
default IP version. If not for that, I would expect IPv6 to reach a
point where IPv4 is but a quaint curiosity within times I can
reasonably expect to live to see - say, the next 30 years.
Given the incredibly botched way IPv6 has been rolled out, e.g., DHCP
still doesn't work, I expect we'll be seeing a lot of it within
networks, but with 6to4 NATs to talk to the rest of the world for a
long time. Unless v4 goes away completely, there's no disadvantage to
sending it through 6to4, since mail, unlike a lot of other
applications is designed to be proxied and relayed.
R's,
John
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