Re: DMARC methods in mailman
"John R Levine" <johnl@taugh.com> Tue, 20 December 2016 23:52 UTC
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Date: Tue, 20 Dec 2016 18:52:44 -0500
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From: John R Levine <johnl@taugh.com>
To: Theodore Ts'o <tytso@mit.edu>
Subject: Re: DMARC methods in mailman
In-Reply-To: <20161220223544.ktfd2kzrz46mjdnu@thunk.org>
References: <m1cJIF7-0000DEC@stereo.hq.phicoh.net> <20161220195601.23551.qmail@ary.lan> <20161220223544.ktfd2kzrz46mjdnu@thunk.org>
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> This starts getting more complicated, but the mailing list could try > intentionally sending a message which fails DMARC (e.g., with a > claimed from address of example@yahoo.com) to the mailing list > subscriber and see if it gets bounced, and use that to set the default > for that setting automatically? Without exception, every suggestion made in this discussion has already been brought up and addressed on the Mailman developers' list, or the DMARC discussion list at dmarc.org. Perhaps people who find this topic to be of interest could learn more faster and save everyone else's time by reading the archives. Among the reasons this particular approach won't work is that at some mail providers, notably Gmail, the DMARC treatment varies both by sender and by recipient. Sometimes they reject, sometimes they accept and deliver, sometimes they accept and file as spam. Whatever they do to a test message may or may not be what they do to real messages. Furthermore, providers change their DMARC mail handling every day (which as, we may recall, is why we have this problem in the first place.) If an operator ignores DMARC failures today, they may do something else next week or next year. Regards, John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail. https://jl.ly
- Re: [IETF] DMARC methods in mailman John Levine
- Re: DMARC methods in mailman Philip Homburg
- Re: DMARC methods in mailman John Levine
- Re: DMARC methods in mailman Theodore Ts'o
- Re: DMARC methods in mailman Randy Bush
- Re: DMARC methods in mailman Philip Homburg
- Re: DMARC methods in mailman John R Levine
- Re: DMARC methods in mailman S Moonesamy
- Re: DMARC methods in mailman Philip Homburg
- Re: DMARC methods in mailman Philip Homburg
- Re: DMARC methods in mailman Theodore Ts'o
- Re: DMARC methods in mailman S Moonesamy
- Re: DMARC methods in mailman Alexey Melnikov
- DMARC stats for IETF mailing lists (was DMARC met… Alexey Melnikov
- Re: DMARC methods in mailman S Moonesamy
- RE: DMARC methods in mailman Christian Huitema
- Re: DMARC methods in mailman John Levine
- Re: DMARC methods in mailman Randy Bush
- Re: [IETF] DMARC methods in mailman Viktor Dukhovni
- Re: [IETF] DMARC methods in mailman Philip Homburg
- Re: [IETF] DMARC methods in mailman Yoav Nir
- Re: [IETF] DMARC methods in mailman Viktor Dukhovni
- Re: [IETF] DMARC methods in mailman Ted Lemon
- Re: [IETF] DMARC methods in mailman tom p.
- Re: [IETF] DMARC methods in mailman Patrik Fältström
- Re: [IETF] DMARC methods in mailman Philip Homburg
- Re: [IETF] DMARC methods in mailman Theodore Ts'o
- Re: [IETF] DMARC methods in mailman John C Klensin
- Re: [IETF] DMARC methods in mailman Viktor Dukhovni
- Re: [IETF] DMARC methods in mailman John Levine
- Re: [IETF] DMARC methods in mailman Theodore Ts'o
- Re: [IETF] DMARC methods in mailman Viktor Dukhovni
- RE: [IETF] DMARC methods in mailman Christian Huitema
- Re: [IETF] DMARC methods in mailman Viktor Dukhovni
- Re: [IETF] DMARC methods in mailman S Moonesamy
- Re: [IETF] DMARC methods in mailman Dave Crocker
- Re: [IETF] DMARC methods in mailman Theodore Ts'o
- Re: [IETF] DMARC methods in mailman John C Klensin
- Re: [IETF] DMARC methods in mailman Dave Crocker
- RE: [IETF] DMARC methods in mailman Christian Huitema
- Re: [IETF] DMARC methods in mailman Dave Crocker
- Re: [IETF] DMARC methods in mailman Viktor Dukhovni
- Re: [IETF] DMARC methods in mailman Dave Crocker
- Re: [IETF] DMARC methods in mailman Viktor Dukhovni
- Re: [IETF] DMARC methods in mailman Viktor Dukhovni