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Re: [dmarc-ietf] hints for receivers

"Murray S. Kucherawy" <superuser@gmail.com> Sat, 20 April 2013 17:49 UTC

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Date: Sat, 20 Apr 2013 10:49:00 -0700
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From: "Murray S. Kucherawy" <superuser@gmail.com>
To: Scott Kitterman <sklist@kitterman.com>
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Cc: "dmarc@ietf.org" <dmarc@ietf.org>
Subject: Re: [dmarc-ietf] hints for receivers
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On Sat, Apr 20, 2013 at 10:21 AM, Scott Kitterman <sklist@kitterman.com>wrote:

> Most of the current deployment is at large providers that can do
> significant
> data analysis to effectively identify lists.  As a small domain, there's
> no way
> I can do the same.
>
> If there were a protocol method to share this information, either among
> trusted receivers or via 'hints', it could be useful to smaller providers
> that
> don't have the scale to mine the data themselves.
>

Why would you, as a small-scale receiver, believe what an unfamiliar sender
claims about whether its traffic transits lists, ultimately meaning "don't
be so strict with this message"?  That seems a big loophole with little
benefit to me, regardless of your size, given the nature of the problem
space; malicious senders will always use it, and good senders that use it
will be spoofed more easily.

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