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

Keith Moore <moore@network-heretics.com> Mon, 28 September 2020 21:41 UTC

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To: ietf-smtp@ietf.org
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From: Keith Moore <moore@network-heretics.com>
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Date: Mon, 28 Sep 2020 17:41:34 -0400
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Subject: Re: [ietf-smtp] EHLO domain validation requirement in RFC 5321
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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.