Re: [dmarc-ietf] Ticket #1 - SPF alignment
Alessandro Vesely <vesely@tana.it> Wed, 10 February 2021 09:49 UTC
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From: Alessandro Vesely <vesely@tana.it>
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Date: Wed, 10 Feb 2021 10:49:46 +0100
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dmarc/rR8yR2wNJvMjlSgAt5J2WrLpCoA>
Subject: Re: [dmarc-ietf] Ticket #1 - SPF alignment
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Just to clarify: On Wed 10/Feb/2021 05:19:38 +0100 Scott Kitterman wrote: > No one has demonstrated that if someone has implemented SPF (RFC 7208) without > worrying about DMARC that there are any associated problems for DMARC. I think I did. OpenDMARC, for example, seems to read a single result, either Authentication-Results: or Received-SPF:, assuming that it contains the mfrom identity unless empty. Note that it has an option to disable SPF entirely, presumably as a means to tackle non-DMARC oriented SPF filters. Google apparently works similarly. Given a valid helo and a neutral mfrom, the spf= clause of its (ARC-)Authentication-Results: only reports the latter. That is to say, you need a non-RFC7208 compliant SPF filter to instruct DMARC. > On Tuesday, February 9, 2021 10:13:37 PM EST Douglas Foster wrote: >> [...] >> >> My interest is interoperability: We want recipient requirements and >> sender compliance measures to align. >> >> RFC 7208 says that recipients MAY want to use SPF HELO and SPF MAILFROM >> together. An argument can be made that this is not necessary: SPF >> MAILFROM shows that the server is authorized to send messages for the >> specific domain in the MAILFROM, while SPF HELO says only that the server >> is authorized to send message for the server domain and an unknowable set >> of other domains. What unknowable set of other domains? If the server has an SPF record, it presumably authorizes just its IP address(es). >> Todd's assertion is that SPF HELO will cause an excessive number of false >> positives. I'd let Todd speak for himself, but I never saw that assertion. Todd said the set of messages that would get a different DMARC status in case we linearize the spec is immeasurable —which I believe is true, and a valid basis to carry out the linearization without fear of disruption. >> A second assumption is that no significant recipients are evaluating SPF >> MAILFROM and SPF HELO together in a way that would be of interest to >> senders. This may also be true, but I don't think this is something that >> can be tested. It makes no sense to require both values to pass simultaneously. Linearization would be that *any* validated identifier, as long as it's aligned, produces a DMARC pass. Best Ale --
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- [dmarc-ietf] Ticket #1 - SPF alignment John R Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Murray S. Kucherawy
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Murray S. Kucherawy
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Dotzero
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Kurt Andersen (b)
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John R Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Todd Herr
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Todd Herr
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Murray S. Kucherawy
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Murray S. Kucherawy
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Murray S. Kucherawy
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Jim Fenton
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Jim Fenton
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John R Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Jim Fenton
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John R Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Michael Thomas
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John R Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Hector Santos
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Hector Santos
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John R Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Jim Fenton
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John R Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John R Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Dotzero
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Kurt Andersen (b)
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Dave Crocker
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Todd Herr
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John Levine
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Kurt Andersen (b)
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Dave Crocker
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Alessandro Vesely
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Douglas Foster
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Scott Kitterman
- Re: [dmarc-ietf] Ticket #1 - SPF alignment Seth Blank
- Re: [dmarc-ietf] Ticket #1 - SPF alignment John Levine