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Re: (DMARC) Why mailing lists are only sort of special

Dave Cridland <dave@cridland.net> Wed, 16 April 2014 20:01 UTC

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References: <CE39F90A45FF0C49A1EA229FC9899B0507D45766@USCLES544.agna.amgreetings.com> <20140414214949.32126.qmail@joyce.lan> <CE39F90A45FF0C49A1EA229FC9899B0507D460CB@USCLES544.agna.amgreetings.com> <alpine.BSF.2.00.1404142150430.32657@joyce.lan> <CAL0qLwbPMm_i0fqNSGQPv=xZaiNASy=icsRNudaNJ_3PNtX3Og@mail.gmail.com> <alpine.BSF.2.00.1404151832460.38826@joyce.lan> <CAL0qLwZUptJVw85T2FjB2HRGoOvcOUHKiQXeadM0QE9BsFVM9w@mail.gmail.com>
Date: Wed, 16 Apr 2014 21:01:04 +0100
Message-ID: <CAKHUCzxpwS+nR9wRGOzU_83f7XabMr0pwB5x-MHrqM-28r80kw@mail.gmail.com>
Subject: Re: (DMARC) Why mailing lists are only sort of special
From: Dave Cridland <dave@cridland.net>
To: "Murray S. Kucherawy" <superuser@gmail.com>
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Cc: John R Levine <johnl@taugh.com>, "ietf@ietf.org" <ietf@ietf.org>
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On 16 April 2014 19:41, Murray S. Kucherawy <superuser@gmail.com> wrote:

> whitelist or a private one.  Are we certain, though, that it's flatly
> impossible to adjust lists in such a way that their traffic could be
> described by these mechanisms?
>
>
If you mean, can we change mailing lists such that they're describable by
DMARC without any change in behaviour, whilst maintaining the essential
premises of mailing lists, then I don't see a mechanism that would allow
this.

If you mean, can we change DMARC (such that existing deployments will have
to change) such that a modified mailing list model (that handles the
existing use cases of mailing lists) would be describable, then I think
that's entirely possible.

Unfortunately, the only option I thought was possibly available isn't
permissible by the specification - therefore, the only solution involves
alterations to the deployed base, which has been ruled impossible for over
a year now.

Dave.

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