[dmarc-discuss] Multiple SPF results in report

Lugo, Dave Dave_Lugo at cable.comcast.com
Mon Apr 4 08:59:22 PDT 2016


Franck,

What if the RFC7208.MAILFROM is empty?  I recall some questions from colleagues re dmarc reporting and the spf scope (help or mailfrom).

Thanks,

Dave

--
Dave Lugo
Engineer, Comcast Anti-Abuse Technologies
Desk: 215-286-5451


From: dmarc-discuss <dmarc-discuss-bounces at dmarc.org<mailto:dmarc-discuss-bounces at dmarc.org>> on behalf of Franck Martin via dmarc-discuss <dmarc-discuss at dmarc.org<mailto:dmarc-discuss at dmarc.org>>
Reply-To: Franck Martin <fmartin at linkedin.com<mailto:fmartin at linkedin.com>>
Date: Monday, April 4, 2016 at 11:51 AM
To: Maarten Oelering <maarten at postmastery.net<mailto:maarten at postmastery.net>>
Cc: "nick at graafhenk.nl<mailto:nick at graafhenk.nl>" <nick at graafhenk.nl<mailto:nick at graafhenk.nl>>, DMARC Discussion List <dmarc-discuss at dmarc.org<mailto:dmarc-discuss at dmarc.org>>
Subject: Re: [dmarc-discuss] Multiple SPF results in report

It is a bug.

There can only be one SPF per record. Theoretically SPF returns 2 results, one for the RFC7208.HELO and another one for RFC7208.MAILFROM, but DMARC takes as input only RFC7208.MAILFROM, therefore only this results is needed in DMARC reports.

RFC7208.MAILFROM is not RFC5321.MailFrom, there is a subtle but important difference here.

On Mon, Apr 4, 2016 at 12:23 AM, Maarten Oelering via dmarc-discuss <dmarc-discuss at dmarc.org<mailto:dmarc-discuss at dmarc.org>> wrote:
Do you mean that in the XML you see 6 <spf> elements in one <auth_results> element? Or do you mean you see 6 different <spf> domains in the your reports?

Maarten Oelering
Postmastery

On 4 apr. 2016, at 09:05, Nick via dmarc-discuss <dmarc-discuss at dmarc.org<mailto:dmarc-discuss at dmarc.org>> wrote:

I received a DMARC report with multiple SPF results. I wonder how this is possible as I only have one SPF record for my domain defined. In one report I got 6 SPF results.

The only thing I could think of is some automatic forwarding service changing the return path header. Are there more usecases possible how this can happen?

Thanks
Nick
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