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Re: [dmarc-ietf] Sender vs From Addresses

"Murray S. Kucherawy" <superuser@gmail.com> Tue, 30 March 2021 04:53 UTC

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References: <F1E2D8D7-9978-4C4B-9FD7-AB6428D12789@contoso.com> <20210324202058.91E777134D1B@ary.qy> <CABuGu1ovwwwwZALDOed74nBu1gOHcom8W+UDKC2GdWiEE_7yKw@mail.gmail.com> <4677E791-B028-4CAC-9752-0F4D8F1B0103@mimecast.com> <2ea2767-4940-77d1-e09e-a0ab215f9c9e@taugh.com> <07b0c7962b3e455bb341972e7fc4ca70@possumdelight.com> <bb85d27c-1aed-b6d-1875-962c8a19093@taugh.com> <4b2a5f14f09b4d009afb07b2963efe38@possumdelight.com>
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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Mon, 29 Mar 2021 21:52:47 -0700
Message-ID: <CAL0qLwYHvBtGqLoz6iiZUMorprx5zDVEaiTHx-za1pA5f4ooTg@mail.gmail.com>
To: Charles Gregory <Charles@possumdelight.com>, Gren Elliot <gelliot@mimecast.com>
Cc: "dmarc@ietf.org" <dmarc@ietf.org>
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Subject: Re: [dmarc-ietf] Sender vs From Addresses
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On Thu, Mar 25, 2021 at 2:39 PM Charles Gregory <Charles@possumdelight.com>
wrote:

> I DO think this is an unnecessary problem that CAN be fixed/improved in
> one of two fairly straightforward manners through DNS (behavior switch or
> list authorized alternate domains).  And I can't see anything but upside in
> doing so; nobody has demonstrated a downside anyways.  Yet I have no idea
> how such decisions are made or the part that anyone plays here.  I will
> review RFC 4407.  Thanks.
>

Even if ATPS had taken off, there's a matter of scale: Very large mailbox
providers like Gmail, Yahoo, etc., would need to find some way to populate
such a list.  They could let their users do it (though getting users to do
more work to manage their accounts is certain to be an uphill battle with a
lot of configuration detritus as collateral), or they could try to automate
it (a non-trivial and probably open-ended engineering investment).  Neither
path is appealing.

-MSK

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