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Re: [ietf-smtp] EHLO domain validation requirement in RFC 5321

2020-09-28 16:41:50
On 9/28/20 10:27 AM, John Levine wrote:

Keith is asking us to expect that mail clients will move behind NAT64
even while their associated servers do not,

No, I expect IPv4 to go away.   Gradually at first, and then much more quickly.    Are people here really going to insist that operators have to maintain IPv4 servers (or ALGs or whatever they need to maintain the illusion that the client and server see the same source IP address?).   Architecturally it seems like an extremely shortsighted viewpoint.

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