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Re: [spfbis] RFC6147 and RFC7208 interoperability issues

Stuart D Gathman <stuart@gathman.org> Mon, 07 February 2022 19:12 UTC

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Date: Mon, 07 Feb 2022 14:12:14 -0500
From: Stuart D Gathman <stuart@gathman.org>
To: John Levine <johnl@taugh.com>
cc: spfbis@ietf.org, ajs@anvilwalrusden.com
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Subject: Re: [spfbis] RFC6147 and RFC7208 interoperability issues
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On Mon, 7 Feb 2022, John Levine wrote:

> It appears that Andrew Sullivan  <ajs@anvilwalrusden.com> said:
> Of course, if you can expect the endpoint to know that much about
> what's going on, you might as well skip the DNS hackery ahd do the
> address translation in the endpoint's socket routines. I probably
> should stop now lest someone think that was a serious suggestion.

Serious suggestion: forget about an IP protocol from the last century,
and use IP6.  If absolutely necessary to receive email from IP4,
use an SMTP gateway listening on IP4 to forward the mail to IP6.  IP info
is captured in headers (either Received or Received-SPF from the trusted
gateway).

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