Re: [dmarc-ietf] Abolishing DMARC policy quarantine

Vladimir Dubrovin <dubrovin@corp.mail.ru> Fri, 14 June 2019 15:08 UTC

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To: Дилян Палаузов <dilyan.palauzov@aegee.org>, dmarc@ietf.org
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From: Vladimir Dubrovin <dubrovin@corp.mail.ru>
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Date: Fri, 14 Jun 2019 18:08:04 +0300
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Subject: Re: [dmarc-ietf] Abolishing DMARC policy quarantine
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p=quarantine with pct=0 is useful to test DMARC with mailing list/groups
which perform "From" rewrite based on DMARC policy. It's safe, because
it actually works like "none" but it causes From rewrites, because it's
still considered as "quarantine".

I would never recommend to use "quarantine" without pct=0, because it
can  mask serious deliverability problems.

12.06.2019 0:00, Дилян Палаузов пишет:
> Dear all,
>
> when DMARC passes, there is no difference between p=reject and p=quarantine.
>
> When DMARC fails validation, this means extra work for humans.  This work can be done by the sending or by the receiving
> organization.
>
> With p=quaratine, the sending organization (domain owner) indicates, that the extra work is supposed to be done by the
> receiving organization.  So for the senders it is just cheaper (in terms of less work) to publish p=quarantine.
>
> With p=reject, the sending organization (domain owner) indicates, that the extra work has to be performed by the sending
> server, which might be the domain owner or some suspects.
>
> However, it is ultimately up to the receiving site to decide, whether it wants to accept this extra work.  If it does
> not accept the extra work, it just handles quarantine as reject.  This does not violate the DMARC specitification.
>
> Do you have a story, why one wants to publish p=quaratnine?  What is the use case for it?  It just makes emails less
> reliable, as they end as Junk and this is very similar to discarding the emails.
>
> Imagine a mailing lists, where the recipient of an email address expands to several mailboxes on different domains.  An
> incoming email fails DMARC validation before being distributed over the ML.  The domain owner for that mail origin has
> published p=quarantine, this email cannot be delivered in the Junk folder of the recipient, because the mailing list
> itself does not have a junk folder.
>
> How about, deleting policy Quarantine and instead rephrasing policy Reject:
>
> It is up to the receiving server if it rejects messages failing DMARC, or accepts and delivers them as Junk.
>
> (This does not change the protocol, just the wording)
>
> Regards
>   Дилян
>
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Vladimir Dubrovin
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