Re: DMARC and yahoo

Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 20 April 2014 20:27 UTC

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Date: Mon, 21 Apr 2014 08:26:56 +1200
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: John C Klensin <john-ietf@jck.com>
Subject: Re: DMARC and yahoo
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]>
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Cc: Michael Richardson <mcr+ietf@sandelman.ca>, Theodore Ts'o <tytso@mit.edu>, ietf@ietf.org
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On 21/04/2014 05:26, John C Klensin wrote:
> 
> --On Sunday, 20 April, 2014 12:52 -0400 Jeffrey Altman
> <jaltman@secure-endpoints.com> wrote:
> 
>> ...
>> I took a different approach.  I left the bounce detection on
>> but switched all @yahoo.com accounts to digest mode.  Since
>> the mail now comes from the list instead of the @yahoo.com
>> sender there are no rejections.   Not a perfect solution but
>> it prevents harm to non-@yahoo.com list participants.
> 
> IMO, this is quite elegant.  The Yahoo users continue to get the
> messages, you don't get cluttered by rejection-related
> complaints, and those Yahoo users who don't like the digest form
> can take it up with Yahoo or find other accounts to use.

Unfortunately they can switch themselves back to normal mode
too. Digest mode is user-settable, and is very annoying because
it munges the Subject header. What's really needed is a DMARC-safe
mode (per subscriber) that optionally rewrites the From.

    Brian