Re: [dmarc-ietf] ARC questions
John R Levine <johnl@taugh.com> Wed, 02 December 2020 20:35 UTC
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Date: Wed, 02 Dec 2020 15:35:06 -0500
Message-ID: <17d886fd-49fd-28d8-f8e4-7caf2e85919c@taugh.com>
From: John R Levine <johnl@taugh.com>
To: Michael Thomas <mike@mtcc.com>, Brandon Long <blong@google.com>
Cc: IETF DMARC WG <dmarc@ietf.org>
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References: <20201124020453.AFDC027CE5C8@ary.qy> <cd855b53-d9bd-3412-3bd5-dc4b7720dc5c@mtcc.com> <CABa8R6s0bfs87Fu9eOq_R3WH1pngauVXrw3RSPe9iWWCtf3AmQ@mail.gmail.com> <c954eadd-5c85-c0d9-2168-8a42de506b72@mtcc.com> <CABa8R6swzAQLPU=xE2tr1W0J5r+w80BSYu87_ubMwHaUMgmKvA@mail.gmail.com> <1eed8278-4efa-4abc-15e0-2efcf014e82e@mtcc.com> <CABa8R6sEk+dHwHjBCKDgcmeT_Z3FymC5+jzy-GGa=7gJYvOf5A@mail.gmail.com> <446d491b-100a-9813-6463-2294f67bbda7@mtcc.com> <aafa5e78-aff9-8076-b76f-62f5b3a13fc1@taugh.com> <4190de2d-9f17-06d5-6354-30c989eecd4a@mtcc.com>
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Subject: Re: [dmarc-ietf] ARC questions
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On Wed, 2 Dec 2020, Michael Thomas wrote: >>> different in that respect. In fact as far as I can tell they are identical >>> modulo the i= difference. >> >> Please reread the ARC spec. The ARC-Authentication-Results at level N >> tells you whether the ARC and DKIM signatures were good at level N-1. > That's why I said "modulo the i= difference" Well, yeah. That i= is why we have ARC seals rather than just using a DKIM signature. Remember that ARC is only useful if the last system sending the message to you is reasonably trustworthy, not in the sense that it never sends spam, but in the sense that its ARC tells the truth about what it saw. That's a low bar that any mailing list should be able to meet. Regards, John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail. https://jl.ly
- [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John Levine
- Re: [dmarc-ietf] ARC questions John Levine
- Re: [dmarc-ietf] ARC questions Kurt Andersen (b)
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Douglas E. Foster
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Douglas E. Foster
- Re: [dmarc-ietf] ARC questions Joseph Brennan
- Re: [dmarc-ietf] ARC questions Todd Herr
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions Doug Foster
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions Todd Herr
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John Levine
- Re: [dmarc-ietf] ARC questions John Levine
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Dave Crocker
- Re: [dmarc-ietf] ARC questions John Levine
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Seth Blank
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Douglas Foster
- Re: [dmarc-ietf] ARC questions Murray S. Kucherawy
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Murray S. Kucherawy
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Murray S. Kucherawy
- Re: [dmarc-ietf] ARC questions Alessandro Vesely
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John Levine
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions John R Levine
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Michael Thomas
- Re: [dmarc-ietf] ARC questions Benny Pedersen
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Brandon Long
- Re: [dmarc-ietf] ARC questions Michael Thomas