Re: DMARC and yahoo

Theodore Ts'o <tytso@mit.edu> Wed, 16 April 2014 15:51 UTC

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Date: Wed, 16 Apr 2014 11:50:55 -0400
From: Theodore Ts'o <tytso@mit.edu>
To: "MH Michael Hammer (5304)" <MHammer@ag.com>
Subject: Re: DMARC and yahoo
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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> <534E57BC.1060501@cs.tcd.ie> <CE39F90A45FF0C49A1EA229FC9899B0507D47D69@USCLES544.agna.amgreetings.com>
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On Wed, Apr 16, 2014 at 02:07:39PM +0000, MH Michael Hammer (5304) wrote:
> 
> 
> Instead of "But had gmail.com..." substitute "When gmail.com
> does..." 

You are asserting that gmail will eventually do what Yahoo has done.

I can't speak for my employer, but I suspect there will be a lot of
people (both inside and outside of the company) lobbying to make sure
gmail doesn't do the same insane thing that Yahoo has done.  I have
quite a bit of faith that senior folks like Vint Cerf will take a bit
more of a nuanced view than some of the DMARC cheerleaders have done,
and his voice does carry a fair amount of weight.

Cheers,

						- Ted

P.S.  One of the reasons why I think mailing list software should pick
mechanisms that inflict pain on yahoo.com customers, and hopefully get
them to switch, is that hopefully other e-mail providers will consider
the costs of using DMARC p=reject for domains where users might need
to send mail to mailing list, and choose differently from Yahoo.