Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal
Barry Leiba <barryleiba@computer.org> Tue, 13 June 2023 01:09 UTC
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In-Reply-To: <B851CF90-0266-41E9-A4F5-FE282146F443@bluepopcorn.net>
From: Barry Leiba <barryleiba@computer.org>
Date: Mon, 12 Jun 2023 21:09:43 -0400
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To: Jim Fenton <fenton@bluepopcorn.net>
Cc: "Murray S. Kucherawy" <superuser@gmail.com>, dmarc@ietf.org
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Subject: Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal
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The misconfiguration is changing it after the message was signed. Once the message is signed and in the MTA-to-MTA relay system, no one should be altering the message body any more until final delivery. Barry On Mon, Jun 12, 2023 at 6:02 PM Jim Fenton <fenton@bluepopcorn.net> wrote: > > On 9 Jun 2023, at 22:35, Murray S. Kucherawy wrote: > > > > > You were previously talking about inserting ">" before a line starting > > "From ", which is typically done on delivery when writing to an > > mbox-formatted mailbox file, because in that format, "From " at the front > > of a line has a specific meaning (i.e., "this is a new message"). If that > > insertion is happening in transport, then a local mailbox convention is > > leaking out into the transport environment, which means something is > > misconfigured, and all bets are off. > > > > In any case, it is not a transport conversion anticipated by the section > > you're quoting, so I've no idea why a DKIM signer might opt to handle it > > specially. > > I’m not as definite that this is a misconfiguration, but might be a historical artifact. When we were editing RFC 4871, I remember discussing with Eric Allman the problem with “from” at the beginning of a line. At the time, we recognized that some messages would fail to verify because the message would be modified in transit to add the >. IIRC this was particularly a problem because message signing was done in a milter that operated on the incoming leg of the message path (through sendmail, for example), when ideally you would want signing to be done on the way out of the MTA. > > Your description of why the > was added is probably correct, but I think there are circumstances where the > leaks out that aren’t just due to misconfiguration. I have two messages in my bloated inbox that apparently have had > added (many of you may have the “Communications of the ACM, May 2023” message from April 24). They pass dkim verification, probably because they were signed after modification. > > -Jim > > _______________________________________________ > dmarc mailing list > dmarc@ietf.org > https://www.ietf.org/mailman/listinfo/dmarc
- [dmarc-ietf] DMARC2 & SPF Dependency Removal Tobias Herkula
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Murray S. Kucherawy
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Seth Blank
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Seth Blank
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Seth Blank
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Tobias Herkula
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Scott Kitterman
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Scott Kitterman
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Seth Blank
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Tobias Herkula
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Benny Pedersen
- Re: [dmarc-ietf] version bump to DMARC2 John Levine
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Hector Santos
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Hector Santos
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Dotzero
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Dotzero
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Scott Kitterman
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Scott Kitterman
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Douglas Foster
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Alessandro Vesely
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Brotman, Alex
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Murray S. Kucherawy
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Scott Kitterman
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Alessandro Vesely
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Alessandro Vesely
- Re: [dmarc-ietf] version bump to DMARC2 Emil Gustafsson
- Re: [dmarc-ietf] version bump to DMARC2 Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Hector Santos
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Hector Santos
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Murray S. Kucherawy
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Alessandro Vesely
- Re: [dmarc-ietf] Errors in the tree walk, was ver… Alessandro Vesely
- [dmarc-ietf] Version bump: was DMARC2 & SPF Depen… Scott Kitterman
- Re: [dmarc-ietf] Version bump: was DMARC2 & SPF D… Tim Wicinski
- Re: [dmarc-ietf] Version bump: was DMARC2 & SPF D… Scott Kitterman
- Re: [dmarc-ietf] Version bump: was DMARC2 & SPF D… Tim Wicinski
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Jesse Thompson
- Re: [dmarc-ietf] PSD flag vs Version bump John Levine
- Re: [dmarc-ietf] PSD flag vs Version bump Barry Leiba
- Re: [dmarc-ietf] PSD flag vs Version bump John R Levine
- Re: [dmarc-ietf] PSD flag vs Version bump Scott Kitterman
- Re: [dmarc-ietf] PSD flag vs Version bump Richard Clayton
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Richard Clayton
- Re: [dmarc-ietf] Version bump: was DMARC2 & SPF D… Alessandro Vesely
- Re: [dmarc-ietf] PSD flag vs Version bump Alessandro Vesely
- Re: [dmarc-ietf] PSD flag vs Version bump Barry Leiba
- Re: [dmarc-ietf] version bump to DMARC2 Emil Gustafsson
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Jim Fenton
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Hector Santos
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Tero Kivinen
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Douglas Foster
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Murray S. Kucherawy
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Seth Blank
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Alessandro Vesely
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Richard Clayton
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Tero Kivinen
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Tero Kivinen
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Tero Kivinen
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Scott Kitterman
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Murray S. Kucherawy
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Alessandro Vesely
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Sebastiaan de Vos
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Douglas Foster
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Alessandro Vesely
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Sebastiaan de Vos
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Michael Kliewe
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Jan Dušátko
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Douglas Foster
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Ken Simpson
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Murray S. Kucherawy
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Hector Santos
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal John Levine
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Hector Santos
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Douglas Foster
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Jan Dušátko
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Ken Simpson
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Barry Leiba
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Alessandro Vesely
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Patrick Ben Koetter
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… John R Levine
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Benny Pedersen
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Wei Chuang
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal David Verdin
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Alessandro Vesely
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Tobias Herkula
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Douglas Foster
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Scott Kitterman
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Todd Herr
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal John Levine
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Alessandro Vesely
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Todd Herr
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Alessandro Vesely
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Sebastiaan de Vos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Douglas Foster
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Sebastiaan de Vos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Todd Herr
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Sebastiaan de Vos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Scott Kitterman
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Douglas Foster
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Murray S. Kucherawy
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Barry Leiba
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Dotzero
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Ken Simpson
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Emil Gustafsson
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… John Levine
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Emanuel Schorsch
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Douglas Foster
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… John R Levine
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Emanuel Schorsch
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… John R Levine
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Emanuel Schorsch
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Barry Leiba
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… John R Levine
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Barry Leiba
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Douglas Foster
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Alessandro Vesely
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Alessandro Vesely
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Jan Dušátko
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Barry Leiba
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Florian.Kunkel
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Scott Kitterman
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Jan Dušátko
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Murray S. Kucherawy
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Alessandro Vesely
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Douglas Foster
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Barry Leiba
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… John Levine
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Alessandro Vesely
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Alessandro Vesely
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Douglas Foster
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Barry Leiba
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Tobias Herkula
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Alessandro Vesely
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Barry Leiba
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Scott Kitterman
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Douglas Foster
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Emanuel Schorsch
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Murray S. Kucherawy
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Douglas Foster
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Murray S. Kucherawy
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… John Levine
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Barry Leiba
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Tero Kivinen
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Jan Dušátko
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Alessandro Vesely
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Murray S. Kucherawy
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Hector Santos
- Re: [dmarc-ietf] easier DKIM, DMARC2 & SPF Depend… Tero Kivinen
- [dmarc-ietf] Why does DKIM fail when SPF succeeds… Matthäus Wander
- Re: [dmarc-ietf] Why does DKIM fail when SPF succ… Murray S. Kucherawy
- Re: [dmarc-ietf] Why does DKIM fail when SPF succ… Matthäus Wander
- Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal Neil Anuskiewicz
- Re: [dmarc-ietf] Why does DKIM fail when SPF succ… OLIVIER HUREAU
- Re: [dmarc-ietf] Why does DKIM fail when SPF succ… Matthäus Wander