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Re: [dmarc-ietf] Recipient domain in aggregate reports (#23)

"Murray S. Kucherawy" <superuser@gmail.com> Tue, 04 May 2021 00:14 UTC

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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Mon, 03 May 2021 17:13:51 -0700
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To: Douglas Foster <dougfoster.emailstandards@gmail.com>
Cc: IETF DMARC WG <dmarc@ietf.org>
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Subject: Re: [dmarc-ietf] Recipient domain in aggregate reports (#23)
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On Mon, May 3, 2021 at 5:26 AM Douglas Foster <
dougfoster.emailstandards@gmail.com> wrote:

> I meant to say that we need N unique (and valid) smtp TO addresses, so
> that an attacker cannot send a single email address and wait for an rua
> report to know where it lands.
>
> Valid addresses are needed to hinder usage of bogus addresses to defeat
> the test.
>

Is that enough?  If I control a domain, I can make up any number of
apparently-valid envelope addresses I want.

Using DKIM selectors for tracking will also put a huge load on DNS if
> implemented at scale [...]
>

How so?

-MSK

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