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Re: (DMARC) We've been here before, was Why mailing lists

"Murray S. Kucherawy" <superuser@gmail.com> Fri, 18 April 2014 20:51 UTC

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Date: Fri, 18 Apr 2014 13:51:07 -0700
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Subject: Re: (DMARC) We've been here before, was Why mailing lists
From: "Murray S. Kucherawy" <superuser@gmail.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Cc: Michael Richardson <mcr+ietf@sandelman.ca>, Pete Resnick <presnick@qti.qualcomm.com>, John R Levine <johnl@taugh.com>, "ietf@ietf.org" <ietf@ietf.org>
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On Fri, Apr 18, 2014 at 1:47 PM, Brian E Carpenter <
brian.e.carpenter@gmail.com> wrote:

> So, if the From says
>
> From: goodguy@yahoo.com <haha@badguy.example.com>
>
> many UAs would show only goodguy@yahoo.com as the sender,
> but badguy could have passed DMARC, no?
>
> This would not exactly enhance goodguy's reputation,
> or Yahoo's for that matter. I realise it isn't the exploit
> that Yahoo is trying to stop, but it suggests to me that
> DMARC is only plugging one small hole in a very leaky dam.
>

Yes indeed.  The DMARC base document discusses this already, by admitting
it's not a problem DMARC can solve right away:

http://tools.ietf.org/html/draft-kucherawy-dmarc-base-04#section-17.4

It's also something that was brought up as a proposed work item for the
IETF.

-MSK

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