John Levine wrote:
As I said a few messages up in this string, although the structure of
IPv4 DNSxLs has long since been cast in concrete, IPv6 DNSxLs aren't
that mature yet and one of my goals was to make them interoperate
equally well so, for example, if you find you're using cruddy ones you
can easily switch to better ones.
I suspect it will be very difficult to make IPv6 DNSxLs work anywhere
nearly as well as IPv4 DNSxLs, because in IPv6 it is fairly easy to use
a different address for every SMTP conversation.
Ietf mailing list