Re: [dmarc-ietf] Summary comments on draft-ietf-dmarc-psd

"Murray S. Kucherawy" <superuser@gmail.com> Sun, 22 March 2020 01:31 UTC

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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Sat, 21 Mar 2020 18:31:14 -0700
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To: John Levine <johnl@taugh.com>
Cc: IETF DMARC WG <dmarc@ietf.org>
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Subject: Re: [dmarc-ietf] Summary comments on draft-ietf-dmarc-psd
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On Wed, Mar 18, 2020 at 6:17 PM John Levine <johnl@taugh.com> wrote:

> >The issue PSD is attempting to address is mail sent as a nonexistent
> >subdomain.  For example, irs.gov doesn't have a subdomain called
> >auditors.irs.gov, so irrespective of any irs.gov DMARC policy, I could
> send
> >email as msk@auditors.irs.gov without limitation. ...
>
> I have less sympathy for that argument.  I do a hard reject of any
> mail with a nonexistent bounce address which I don't think is unusual.
>
> PSD as I understand it is to address the same issue the organizational
> domain does, but a level up, in a group of organizations that have
> some administrative connection.  The issue is people who publish A and
> MX records without covering DMARC records.  They're not supposed to do
> that but they do, and PSD is one way of figuring out who needs to fix what.
>

Sorry, yes, my example was faulty.

-MSK