Re: [dmarc-ietf] Ticket #1 - SPF alignment

Douglas Foster <dougfoster.emailstandards@gmail.com> Sun, 07 February 2021 12:34 UTC

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From: Douglas Foster <dougfoster.emailstandards@gmail.com>
Date: Sun, 7 Feb 2021 07:34:33 -0500
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To: IETF DMARC WG <dmarc@ietf.org>
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Subject: Re: [dmarc-ietf] Ticket #1 - SPF alignment
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"We have a lot of other topics" is the wrong reason to call for consensus.
 The important question is "Ale, have we addressed your concerns?"

I agree with many that for DMARC, our primary interest is whether SPF
validation of MAILFROM produces a PASS.

However, I also see that a cautious recipient may choose to also require
SPF HELO = PASS and / or fcDNS HELO = PASS ( VERIFIED ).   Getting a PASS
on these multiple criteria increases the confidence in the PASS result, but
also increases the likelihood of ambiguous results and false rejects.
Therefore:
 - Recipients need to be cautious about enforcing rules so strictly that
sender configuration errors produce unwanted disposition decisions.
 - Senders need to be careful to ensure that they configure their policy to
produce both SPF MAILFROM = PASS and SPF HELO=PASS.

Altogether, I think some wordsmithing is needed to communicate those
points.   I do not have such wording at this moment, but will begin
thinking about what I would propose.   Perhaps those who are anxious to
move on will be able to produce text sooner.

I have also raised a concern about the inadequacy of reporting these
results, since "Recevied-SPF: pass" is currently a compliant header.   We
can defer this issue to a later ticket, but we need to be thinking about
the problem.   If this requires no change, I would like some discussion of
why that might be the case.

DF


On Sat, Feb 6, 2021 at 8:16 PM Dave Crocker <dcrocker@gmail.com> wrote:

> On 2/6/2021 3:57 PM, Kurt Andersen (b) wrote:
> >
> > +1 - now, if only we had a real voting system :-P
>
> Yeah, 'cause this one is really close, and it's hard to tell what the
> decision is...
>
>
> d/
>
> ps.  +1
>
> --
> Dave Crocker
> dcrocker@gmail.com
> 408.329.0791
>
> Volunteer, Silicon Valley Chapter
> American Red Cross
> dave.crocker2@redcross.org
>
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