Re: [dmarc-ietf] Abolishing DMARC policy quarantine

"Murray S. Kucherawy" <superuser@gmail.com> Wed, 24 July 2019 15:27 UTC

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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Wed, 24 Jul 2019 11:27:13 -0400
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To: Vladimir Dubrovin <dubrovin=40corp.mail.ru@dmarc.ietf.org>
Cc: Dotzero <dotzero@gmail.com>, IETF DMARC WG <dmarc@ietf.org>, =?UTF-8?B?0JTQuNC70Y/QvSDQn9Cw0LvQsNGD0LfQvtCy?= <dilyan.palauzov@aegee.org>
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Subject: Re: [dmarc-ietf] Abolishing DMARC policy quarantine
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On Fri, Jun 14, 2019 at 12:25 PM Vladimir Dubrovin <dubrovin=
40corp.mail.ru@dmarc.ietf.org> wrote:

> Nope, I mean 2 different things.
>
> 1. Why quarantine is useful (with pct=0).
>
> For example this mailing list (dmarc@ietf.org) performs From rewrite (aka
> From munging), e.g. dubrovin@corp.mail.ru is replaced with
> dubrovin=40corp.mail.ru@dmarc.ietf.org. It's because corp.mail.ru has a
> strict DMARC policy (reject). dotzero@gmail.com is not overwritten,
> because gmail.com has p=none and ietf.org only overwrites From only for
> domains with "quarantine" and "reject" policies. It's quite common behavior.
>
> If you are implementing DMARC for a new domain (let's say example.org),
> you usually start with "p=none". With p=none you receive reports for failed
> DMARC for different lists, like ietf.org. Before switching to stronger
> policy (p=reject), you may want to know which mailing list will still fail
> DMARC, and which lists perform From munging and, as a result, do not fail
> DMARC. For this purpose, before switching to "p=reject" it's useful to
> switch to "p=quarantine;pct=0". After this, you will only see mailing lists
> without From munging in DMARC reports.
>

I'm confused; is this claiming that those rewrites happen by virtue of the
fact that "p=quarantine" is the published policy?  Seems to me that
rewriting will happen irrespective of what the published policy is for the
>From domain.

Or is it the case that this changes the content of the aggregate reports in
a way you find meaningful?

-MSK