Re: DMARC: perspectives from a listadmin of large open-source lists
"John R Levine" <johnl@taugh.com> Tue, 08 April 2014 06:28 UTC
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Date: Tue, 08 Apr 2014 02:28:15 -0400
Message-ID: <alpine.BSF.2.00.1404080216160.73769@joyce.lan>
From: John R Levine <johnl@taugh.com>
To: "Robin H. Johnson" <robbat2@gentoo.org>
Subject: Re: DMARC: perspectives from a listadmin of large open-source lists
In-Reply-To: <20140408053752.GB2858@orbis-terrarum.net>
References: <robbat2-20140408T031810-279861577Z@orbis-terrarum.net> <alpine.BSF.2.00.1404072357400.73388@joyce.lan> <20140408053752.GB2858@orbis-terrarum.net>
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> I think the original scenario you described could be implemented by bad > players as follows: > - set up a mailman instance with DMARC support, that forges the XOAR header. > - Ensure that the mailman outgoing mail passes SPF+DKIM for the domain in question. Right, except it doesn't even have to be mailman, just spamware that creates headers that look like mailman's. Like I said, if you trust the sender to be a real list, deliver its mail. If you don't, don't. I don't think there are any major conceptual challenges here. > Those uses shouldn't be considered valid, and NYTimes has already moved > away from that, at least as of my test 5 minutes ago. Well, the WSJ does. This is a perfectly reasonable way to send mail, endorsed by decades of practice. |Date: Tue, 8 Apr 2014 02:24:13 |From: "wsjol@johnlevine.com" <wsjol@johnlevine.com> |To: johnl@taugh.com |Subject: WSJ.com - Ukrainian leaders, U.S. slam Russia over new unrest; The envelope bounce address is <bounces@wsjemail.com>, again perfectly reasonable. > By implement DMARC, I meant implement XOAR headers; VERP is too useful As described above, XOAR is not useful because you can't trust it. Regards, John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail.
- Re: DMARC: perspectives from a listadmin of large… John R Levine
- Re: DMARC: perspectives from a listadmin of large… Sabahattin Gucukoglu
- Re: DMARC: perspectives from a listadmin of large… Scott Kitterman
- Re: DMARC: perspectives from a listadmin of large… Brian E Carpenter
- Re: DMARC: perspectives from a listadmin of large… John R Levine
- Re: DMARC: perspectives from a listadmin of large… Sabahattin Gucukoglu
- Re: DMARC: perspectives from a listadmin of large… Dave Crocker
- DMARC: perspectives from a listadmin of large ope… Robin H. Johnson
- Re: DMARC: perspectives from a listadmin of large… Robin H. Johnson
- Re: DMARC: perspectives from a listadmin of large… Robin H. Johnson
- Re: DMARC: perspectives from a listadmin of large… ned+ietf
- Re: DMARC: perspectives from a listadmin of large… S Moonesamy
- Re: DMARC: perspectives from a listadmin of large… John R Levine
- RE: DMARC: perspectives from a listadmin of large… Alex Ojeda
- Re: DMARC: perspectives from a listadmin of large… Hector Santos
- Re: DMARC: perspectives from a listadmin of large… Hector Santos
- Re: DMARC: perspectives from a listadmin of large… S Moonesamy
- Re: DMARC: perspectives from a listadmin of large… S Moonesamy
- Re: DMARC: perspectives from a listadmin of large… John Levine
- Re: DMARC: perspectives from a listadmin of large… Alessandro Vesely
- Re: DMARC: perspectives from a listadmin of large… Hector Santos
- Re: DMARC: perspectives from a listadmin of large… Hector Santos
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Doug Barton
- Re: DMARC: perspectives from a listadmin of large… John Levine
- Re: DMARC: perspectives from a listadmin of large… Doug Barton
- Re: DMARC: perspectives from a listadmin of large… ned+ietf
- Re: DMARC: perspectives from a listadmin of large… Dave Crocker
- Re: DMARC: perspectives from a listadmin of large… John R Levine
- Re: DMARC: perspectives from a listadmin of large… John C Klensin
- Re: DMARC: perspectives from a listadmin of large… John R Levine
- Re: DMARC: perspectives from a listadmin of large… Sabahattin Gucukoglu
- Re: DMARC: perspectives from a listadmin of large… John C Klensin
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Doug Barton
- Re: DMARC: perspectives from a listadmin of large… John C Klensin
- Re: DMARC: perspectives from a listadmin of large… S Moonesamy
- RE: DMARC: perspectives from a listadmin of large… l.wood
- Re: DMARC: perspectives from a listadmin of large… Dave Crocker
- Re: DMARC: perspectives from a listadmin of large… John C Klensin
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- RE: DMARC: perspectives from a listadmin of large… MH Michael Hammer (5304)
- Re: DMARC: perspectives from a listadmin of large… Murray S. Kucherawy
- Re: DMARC: perspectives from a listadmin of large… Murray S. Kucherawy
- Re: DMARC: perspectives from a listadmin of large… Murray S. Kucherawy
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Murray S. Kucherawy
- Re: DMARC: perspectives from a listadmin of large… S Moonesamy
- Mailman 2.1.16 [DMARC: perspectives from a listad… Brian E Carpenter
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… Theodore Ts'o
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Dave Cridland
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Murray S. Kucherawy
- Re: protecting the Internet from DMARC damage, wa… John Levine
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… John Levine
- Re: DMARC: perspectives from a listadmin of large… Dave Cridland
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… John Levine
- RE: DMARC: perspectives from a listadmin of large… MH Michael Hammer (5304)
- Re: DMARC: perspectives from a listadmin of large… Doug Barton
- Re: DMARC: perspectives from a listadmin of large… Doug Barton
- Re: DMARC: perspectives from a listadmin of large… Dave Crocker
- Re: DMARC: perspectives from a listadmin of large… Murray S. Kucherawy
- RE: DMARC: perspectives from a listadmin of large… S Moonesamy
- Re: DMARC: perspectives from a listadmin of large… Douglas Otis
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… John Levine
- RE: protecting the Internet from DMARC damage, wa… MH Michael Hammer (5304)
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… Brian E Carpenter
- RE: protecting the Internet from DMARC damage, wa… John R Levine
- Re: DMARC: perspectives from a listadmin of large… Doug Barton
- Re: DMARC: perspectives from a listadmin of large… Scott Kitterman
- Re: DMARC: perspectives from a listadmin of large… Scott Kitterman
- Re: protecting the Internet from DMARC damage, wa… Murray S. Kucherawy
- Re: DMARC: perspectives from a listadmin of large… Dave Cridland
- Re: DMARC: perspectives from a listadmin of large… Alessandro Vesely
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… Michael Richardson
- Re: DMARC: perspectives from a listadmin of large… ned+ietf
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… Theodore Ts'o
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… John R Levine
- Re: DMARC: perspectives from a listadmin of large… Dave Crocker
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… Michael Richardson
- Re: DMARC: perspectives from a listadmin of large… S Moonesamy
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… Theodore Ts'o
- Re: DMARC: perspectives from a listadmin of large… S Moonesamy
- Re: DMARC: perspectives from a listadmin of large… Pete Resnick
- Re: Mailman 2.1.16 [DMARC: perspectives from a li… Brian E Carpenter
- RE: DMARC: perspectives from a listadmin of large… MH Michael Hammer (5304)
- Re: DMARC: perspectives from a listadmin of large… Hector Santos
- Re: DMARC: perspectives from a listadmin of large… Hector Santos
- Re: DMARC: perspectives from a listadmin of large… Brian E Carpenter
- Re: DMARC: perspectives from a listadmin of large… Theodore Ts'o
- Re: DMARC: perspectives from a listadmin of large… Sabahattin Gucukoglu
- Re: DMARC: perspectives from a listadmin of large… Scott Kitterman
- Re: DMARC: perspectives from a listadmin of large… Theodore Ts'o
- Let's talk (was: DMARC: perspectives from a lista… S Moonesamy
- (DMARC) Why mailing lists are only sort of special John R Levine
- RE: Let's talk (was: DMARC: perspectives from a l… MH Michael Hammer (5304)
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… John R. Levine
- Re: DMARC: perspectives from a listadmin of large… Pete Resnick
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: DMARC: perspectives from a listadmin of large… Michael Richardson
- Re: DMARC: perspectives from a listadmin of large… John Levine
- RE: Let's talk (was: DMARC: perspectives from a l… S Moonesamy
- Re: Let's talk (was: DMARC: perspectives from a l… Dave Cridland
- Re: (DMARC) Why mailing lists are only sort of sp… Murray S. Kucherawy
- Re: (DMARC) Why mailing lists are only sort of sp… Dave Cridland
- Re: (DMARC) Why mailing lists are only sort of sp… Dave Cridland
- RE: Let's talk (was: DMARC: perspectives from a l… MH Michael Hammer (5304)
- Re: (DMARC) Why mailing lists are only sort of sp… John R Levine
- Re: (DMARC) Why mailing lists are only sort of sp… Murray S. Kucherawy
- Re: (DMARC) Why mailing lists are only sort of sp… Murray S. Kucherawy
- Re: (DMARC) Why mailing lists are only sort of sp… Miles Fidelman
- Re: (DMARC) Why mailing lists are only sort of sp… Pete Resnick
- Re: (DMARC) Why mailing lists are only sort of sp… tytso
- Re: DMARC: perspectives from a listadmin of large… Miles Fidelman
- Re: (DMARC) Why mailing lists are only sort of sp… Mark Andrews
- Re: (DMARC) We've been here before, was Why maili… John R Levine
- Re: (DMARC) How a whitelist would work, was Why m… John R Levine
- Re: (DMARC) We've been here before, was Why maili… Pete Resnick
- Re: (DMARC) Why mailing lists are only sort of sp… Dave Cridland
- Re: (DMARC) Why mailing lists are only sort of sp… Yoav Nir
- Re: (DMARC) We've been here before, was Why maili… John R Levine
- Re: (DMARC) Why mailing lists are only sort of sp… Martin Rex
- Re: (DMARC) Why mailing lists are only sort of sp… Yoav Nir
- Re: (DMARC) Why mailing lists are only sort of sp… Dave Cridland
- RE: (DMARC) Why mailing lists are only sort of sp… MH Michael Hammer (5304)
- Re: (DMARC) We've been here before, was Why maili… Pete Resnick
- Re: (DMARC) Why mailing lists are only sort of sp… Miles Fidelman
- Re: (DMARC) We've been here before, was Why maili… ned+ietf
- Re: (DMARC) We've been here before, was Why maili… Miles Fidelman
- Re: (DMARC) We've been here before, was Why maili… Martin Rex
- Re: (DMARC) We've been here before, was Why maili… ned+ietf
- Re: (DMARC) We've been here before, was Why maili… Douglas Otis
- Re: (DMARC) We've been here before, was Why maili… Martin Rex
- Re: (DMARC) We've been here before, was Why maili… John Levine
- Re: (DMARC) We've been here before, was Why maili… Murray S. Kucherawy
- Re: (DMARC) We've been here before, was Why maili… John Levine
- Re: (DMARC) We've been here before, was Why maili… Martin Rex
- Re: (DMARC) We've been here before, was Why maili… John Levine
- Re: (DMARC) We've been here before, was Why maili… Michael Richardson
- Re: (DMARC) How a whitelist would work, was Why m… Michael Richardson
- Re: (DMARC) Why mailing lists are only sort of sp… Michael Richardson
- Re: (DMARC) How a whitelist would work, was Why m… John R Levine
- Re: (DMARC) How a whitelist would work, was Why m… Miles Fidelman
- Re: (DMARC) Why mailing lists are only sort of sp… John Levine
- Re: (DMARC) We've been here before, was Why maili… John Levine
- Re: (DMARC) How a whitelist would work, was Why m… Yoav Nir
- Re: (DMARC) How a whitelist would work, was Why m… John R Levine
- Re: (DMARC) We've been here before, was Why maili… Murray S. Kucherawy
- Re: (DMARC) We've been here before, was Why maili… John R Levine
- Re: (DMARC) We've been here before, was Why maili… Theodore Ts'o
- Re: (DMARC) We've been here before, was Why maili… Douglas Otis
- Re: (DMARC) We've been here before, was Why maili… Murray S. Kucherawy
- Re: (DMARC) We've been here before, was Why maili… John R Levine
- Re: (DMARC) We've been here before, was Why maili… Theodore Ts'o
- Re: (DMARC) We've been here before, was Why maili… Murray S. Kucherawy
- Re: (DMARC) We've been here before, was Why maili… tytso
- Re: (DMARC) We've been here before, was Why maili… Murray S. Kucherawy
- Re: (DMARC) We've been here before, was Why maili… tytso
- Re: (DMARC) We've been here before, was Why maili… Brian E Carpenter
- Re: (DMARC) We've been here before, was Why maili… Murray S. Kucherawy
- Re: (DMARC) We've been here before, was Why maili… Theodore Ts'o
- [off-off-track] Re: (DMARC) We've been here befor… Miles Fidelman
- Re: (DMARC) We've been here before, was Why maili… John Levine
- Re: (DMARC) We've been here before, was Why maili… Alessandro Vesely