RE: DMARC and yahoo
Christian Huitema <huitema@microsoft.com> Mon, 21 April 2014 01:00 UTC
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From: Christian Huitema <huitema@microsoft.com>
To: Doug Barton <dougb@dougbarton.us>, "ietf@ietf.org" <ietf@ietf.org>
Subject: RE: DMARC and yahoo
Thread-Topic: DMARC and yahoo
Thread-Index: AQHPWQufPRozOu2//Em9ol77DALEOZsTcnaAgAARHwCAAAQmgIAHOCWAgAAJZwCAAEI4AIAAOEyw
Date: Mon, 21 Apr 2014 01:00:17 +0000
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References: <CAKW6Ri6OUmxGaBOGR2hoWpDOGWsVQ9tQ2Q9ogkT5wzFhFJLBbQ@mail.gmail.com> <534D9C2C.8010606@gmail.com> <20140415214348.GL4456@thunk.org> <1397607352.389753533@f361.i.mail.ru> <534DCFFB.4080102@gmail.com> <20140416012205.GC12078@thunk.org> <24986.1397615002@sandelman.ca> <20140416023813.GA21807@thunk.org> <C8A2B0B4-5FA4-4BFE-AECE-C61667ECF2FB@secure-endpoints.com> <4948F093F369F051CAF0B810@[192.168.1.128]> <53543ADA.8010204@dougbarton.us>
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> The issue with @yahoo.com and DMARC is not the @yahoo.com users' ability > to receive mail, it's their ability to send mail to the list with From: > *@yahoo.com and have it be received by list subscribers who implement > strict DMARC policies which honor Yahoo!'s p=reject. > > It's not clear how setting the @yahoo.com users to digest mode helps > this situation at all. It probably does not. Trying analyze the various positions with a cool head, the obvious conclusion is that hard problems don't have easy answers. The current mailing list practice has the mailing list as sender, and the original message composer described in the From field. The receiver sees something like: Sender: ietf <ietf-bounces@ietf.org> From: Christian Huitema <huitema@microsoft.com> … Of course, that particular construct could easily be abused. A phishing message does not differ much from a mailing list message: Sender: postmaster <postmaster@phishing-domain.com> From: Christian Huitema <huitema@microsoft.com> … I understand that the DMARC "alignment" policy is meant to protect against that by requesting that sender domain and from field match. The problem is that a mailing list would then have to invent a new from field, letting the recipient see something like: From: Christian Huitema <ietf-christian-huitema@ietf.org> Reply-To: Christian Huitema <huitema@microsoft.com> … The obvious issue is that this particular construct is also quite friendly to phishing. The phishing message would look like: From: Christian Huitema <christian-huitema@phishing-domain.com> Reply-To: Christian Huitema <huitema@microsoft.com> … If we teach users to ignore the bizarre email address for the mail list messages, we are also teaching them to ignore the bizarre email address in the phishing messages. I doubt that this was the intent of the DMARC authors. -- Christian Huitema (I wrote a longer version of this email at http://huitema.wordpress.com/.)
- DMARC from the perspective of the listadmin of a … Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Dave Crocker
- Re: DMARC from the perspective of the listadmin o… Michael Richardson
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Hector Santos
- Re: DMARC from the perspective of the listadmin o… Brian E Carpenter
- Re: DMARC from the perspective of the listadmin o… Theodore Ts'o
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Mark Andrews
- Re: DMARC from the perspective of the listadmin o… Hector Santos
- Re: DMARC from the perspective of the listadmin o… Douglas Otis
- Re: DMARC from the perspective of the listadmin o… Dave Crocker
- Re: DMARC from the perspective of the listadmin o… Andrew G. Malis
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… John Levine
- Re: DMARC from the perspective of the listadmin o… Brian E Carpenter
- Re: DMARC from the perspective of the listadmin o… Brian E Carpenter
- Re: DMARC from the perspective of the listadmin o… Theodore Ts'o
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Dick Franks
- Re: DMARC from the perspective of the listadmin o… Dick Franks
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re[2]: DMARC and yahoo mohammed serrhini
- Re: DMARC from the perspective of the listadmin o… Hector Santos
- Re: DMARC from the perspective of the listadmin o… Dick Franks
- Re: DMARC from the perspective of the listadmin o… Murray S. Kucherawy
- Re: DMARC from the perspective of the listadmin o… Dave Crocker
- Re: DMARC and yahoo Doug Royer
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Murray S. Kucherawy
- Re: DMARC from the perspective of the listadmin o… Warren Kumari
- Re: DMARC from the perspective of the listadmin o… Murray S. Kucherawy
- RE: DMARC from the perspective of the listadmin o… MH Michael Hammer (5304)
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC and yahoo Theodore Ts'o
- Re: DMARC from the perspective of the listadmin o… Dick Franks
- Re: DMARC from the perspective of the listadmin o… Brian E Carpenter
- Re: DMARC from the perspective of the listadmin o… Rolf E. Sonneveld
- Re: DMARC from the perspective of the listadmin o… Dave Crocker
- Re: DMARC from the perspective of the listadmin o… Murray S. Kucherawy
- Re: DMARC from the perspective of the listadmin o… Murray S. Kucherawy
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Dave Cridland
- Re: DMARC from the perspective of the listadmin o… Dick Franks
- What I've been wondering about the DMARC problem Brian E Carpenter
- Re: What I've been wondering about the DMARC prob… Doug Barton
- Re: DMARC and yahoo Doug Royer
- Re: What I've been wondering about the DMARC prob… Miles Fidelman
- Re: What I've been wondering about the DMARC prob… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Ted Lemon
- Re: What I've been wondering about the DMARC prob… Theodore Ts'o
- Re: DMARC from the perspective of the listadmin o… Scott Kitterman
- Re: DMARC and yahoo Theodore Ts'o
- What I've been wondering about the DMARC problem Abdussalam Baryun
- Re: What I've been wondering about the DMARC prob… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Sabahattin Gucukoglu
- Re: What I've been wondering about the DMARC prob… Seth Johnson
- Re: What I've been wondering about the DMARC prob… Seth Johnson
- RE: What I've been wondering about the DMARC prob… l.wood
- Re: DMARC and yahoo Douglas Otis
- Re: What I've been wondering about the DMARC prob… Seth Johnson
- Re: What I've been wondering about the DMARC prob… Dave Crocker
- Re: DMARC from the perspective of the listadmin o… Hector Santos
- Re: What I've been wondering about the DMARC prob… Miles Fidelman
- Re: What I've been wondering about the DMARC prob… Seth Johnson
- Re: What I've been wondering about the DMARC prob… Miles Fidelman
- Re: What I've been wondering about the DMARC prob… Paul Ferguson
- Re: What I've been wondering about the DMARC prob… Miles Fidelman
- Re: What I've been wondering about the DMARC prob… Hector Santos
- Re: What I've been wondering about the DMARC prob… Miles Fidelman
- RE: What I've been wondering about the DMARC prob… MH Michael Hammer (5304)
- Re: What I've been wondering about the DMARC prob… Hector Santos
- RE: What I've been wondering about the DMARC prob… MH Michael Hammer (5304)
- Re: What I've been wondering about the DMARC prob… Brian E Carpenter
- Re: DMARC and yahoo Doug Royer
- Re: DMARC and yahoo Theodore Ts'o
- Re: DMARC and yahoo Michael Richardson
- Re: DMARC and yahoo Theodore Ts'o
- Re: What I've been wondering about the DMARC prob… Sabahattin Gucukoglu
- Re: DMARC and yahoo Stephen Farrell
- Re: DMARC and yahoo Hector Santos
- Re: DMARC and yahoo Randy Bush
- Re: DMARC and yahoo Yoav Nir
- RE: DMARC and yahoo MH Michael Hammer (5304)
- Re: DMARC and yahoo Theodore Ts'o
- RE: DMARC and yahoo MH Michael Hammer (5304)
- Re: What I've been wondering about the DMARC prob… Jim Fenton
- Re: What I've been wondering about the DMARC prob… Brian E Carpenter
- Re: DMARC and yahoo Miles Fidelman
- RE: DMARC and yahoo l.wood
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC from the perspective of the listadmin o… Douglas Otis
- Re: DMARC from the perspective of the listadmin o… John C Klensin
- Re: What I've been wondering about the DMARC prob… Sabahattin Gucukoglu
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: What I've been wondering about the DMARC prob… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Hector Santos
- Re: What I've been wondering about the DMARC prob… Brian E Carpenter
- Re: What I've been wondering about the DMARC prob… Theodore Ts'o
- Re: What I've been wondering about the DMARC prob… John Levine
- Re: DMARC from the perspective of the listadmin o… Martin Rex
- Re: DMARC from the perspective of the listadmin o… Doug Barton
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC from the perspective of the listadmin o… Murray S. Kucherawy
- Re: DMARC from the perspective of the listadmin o… John Levine
- Re: What I've been wondering about the DMARC prob… Murray S. Kucherawy
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: What I've been wondering about the DMARC prob… Sabahattin Gucukoglu
- Re: What I've been wondering about the DMARC prob… Sabahattin Gucukoglu
- RE: DMARC from the perspective of the listadmin o… MH Michael Hammer (5304)
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- RE: DMARC from the perspective of the listadmin o… MH Michael Hammer (5304)
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Doug Barton
- Re: DMARC from the perspective of the listadmin o… Theodore Ts'o
- Re: DMARC from the perspective of the listadmin o… Randy Bush
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC from the perspective of the listadmin o… John C Klensin
- Re: What I've been wondering about the DMARC prob… ned+ietf
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC from the perspective of the listadmin o… Hector Santos
- Re: DMARC from the perspective of the listadmin o… John C Klensin
- Re: DMARC from the perspective of the listadmin o… Pete Resnick
- Re: DMARC and yahoo Jeffrey Altman
- Re: DMARC and yahoo John Levine
- Re: DMARC and yahoo Hector Santos
- Re: DMARC and yahoo John C Klensin
- Re: DMARC and yahoo Brian E Carpenter
- One size doesn't fit all [Re: DMARC ....] Brian E Carpenter
- Re: DMARC from the perspective of the listadmin o… Dave Crocker
- Somebody always claims something (was Re: DMARC f… Dave Crocker
- Re: DMARC and yahoo Doug Barton
- Re: DMARC and yahoo Hector Santos
- Re: DMARC and yahoo Theodore Ts'o
- RE: DMARC and yahoo Christian Huitema
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC and yahoo Yoav Nir
- Re: DMARC and yahoo John Levine
- Re: DMARC and yahoo Dave Crocker
- Re: What I've been wondering about the DMARC prob… Murray S. Kucherawy
- Re: DMARC and yahoo Doug Royer
- Re: What I've been wondering about the DMARC prob… ned+ietf
- Re: DMARC and yahoo Dave Crocker
- Re: DMARC and yahoo Douglas Otis
- Re: What I've been wondering about the DMARC prob… John Levine
- Re: DMARC and yahoo Brian E Carpenter
- Re: What I've been wondering about the DMARC prob… Murray S. Kucherawy
- Re: DMARC and yahoo Rolf E. Sonneveld
- Re: What I've been wondering about the DMARC prob… ned+ietf
- Re: DMARC and yahoo Douglas Otis
- Re: DMARC from the perspective of the listadmin o… Doug Barton
- Re: DMARC from the perspective of the listadmin o… Martin Rex
- Re: DMARC from the perspective of the listadmin o… Doug Barton
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Martin Rex
- Re: DMARC from the perspective of the listadmin o… Scott Kitterman
- Re: DMARC from the perspective of the listadmin o… Douglas Otis
- Re: DMARC from the perspective of the listadmin o… Scott Kitterman
- Re: DMARC from the perspective of the listadmin o… Martin Rex
- Re: DMARC from the perspective of the listadmin o… John R Levine
- Re: DMARC from the perspective of the listadmin o… Ted Lemon
- Re: DMARC from the perspective of the listadmin o… ned+ietf
- Re: DMARC from the perspective of the listadmin o… Dave Crocker
- Re: DMARC from the perspective of the listadmin o… Martin Rex
- Re: DMARC from the perspective of the listadmin o… Douglas Otis
- Re: DMARC from the perspective of the listadmin o… Hector Santos
- The IETF environment (was: Re: DMARC from the per… ned+ietf
- Re: The IETF environment Dave Crocker
- RE: The IETF environment Adrian Farrel
- Re: The IETF environment Miles Fidelman
- Re: The IETF environment Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Miles Fidelman
- Re: DMARC from the perspective of the listadmin o… Murray S. Kucherawy
- Re: The IETF environment Abdussalam Baryun
- Re: The IETF environment Dale R. Worley
- Re: The IETF environment Brian E Carpenter
- Re: The IETF environment Dave Crocker
- Re: The IETF environment Phillip Hallam-Baker
- Re: DMARC from the perspective of the listadmin o… Hector Santos
- Re: The IETF environment S Moonesamy
- Re: The IETF environment Dave Crocker
- Re: The IETF environment Miles Fidelman
- RE: The IETF environment Christian Huitema
- Re: The IETF environment S Moonesamy
- Re: The IETF environment Miles Fidelman
- Workshop effects [Re: The IETF environment] Brian E Carpenter
- Re: Workshop effects [Re: The IETF environment] Abdussalam Baryun