Knowing that mail servers are not deployed on IPv6,
They're not? Mine has been for years. netbsd.org's MX host is
v6-reachable and I think it has been for years too. freebsd.org's
ditto. And two of icann.org's five MX hosts are v6-reachable too and
probably have been for quite a while.
Where did you get the idea mailservers aren't deployed on v6?
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