Re: [spfbis] auth-results and spf

"Murray S. Kucherawy" <superuser@gmail.com> Thu, 11 February 2016 04:37 UTC

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Date: Wed, 10 Feb 2016 20:37:50 -0800
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From: "Murray S. Kucherawy" <superuser@gmail.com>
To: Scott Kitterman <spf2@kitterman.com>
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Cc: "spfbis@ietf.org" <spfbis@ietf.org>
Subject: Re: [spfbis] auth-results and spf
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On Tue, Feb 9, 2016 at 5:27 PM, Scott Kitterman <spf2@kitterman.com>; wrote:

> If I recall correctly, this goes back to the original discussions on
> mail-vet-discuss@mipassoc.org and what became RFC 5451.  You can check
> the list archive for details, but I believe it wasn't included on the
> theory that IP address is an input, not an output of the SPF check.
>
> This was hotly debated at the time and this is how it came out.  It's one
> of the reasons that A-R isn't a complete replacement for Received-SPF.
>
>
Yeah, that was mostly it.  A-R was meant to provide (a) the outputs of
authentication methods, and (b) what thing was actually authenticated,
i.e., what part of the visible message you think is "safe" as a result.
For most methods I can think of, it's the domain name in the From: field or
the MAIL FROM parameter, so there was no need to report the IP address as
well; what would a typical user do with that?

Someone was pushing to add it so that SPF could be re-evaluated by the MUA,
but there wasn't much in the way of support for that (and, in fact, it
resulted in what is now Appendix C of RFC7601).

-MSK