Re: [dmarc-ietf] Sender vs From Addresses

John R Levine <johnl@taugh.com> Sat, 27 March 2021 22:00 UTC

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Date: 27 Mar 2021 18:00:18 -0400
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From: "John R Levine" <johnl@taugh.com>
To: "Jim Fenton" <fenton@bluepopcorn.net>
Cc: dmarc@ietf.org
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Subject: Re: [dmarc-ietf] Sender vs From Addresses
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On Sat, 27 Mar 2021, Jim Fenton wrote:
>> It sounds like they're asking DMARC to do things it doesn't do. If you
>> can't ensure that everything sent with your domain on the From line is
>> signed with your signature, you shouldn't publish a DMARC policy.
>
> Agreed, but in some cases, such as US Government agencies, the publication of 
> a p=reject policy is required:
>
> https://cyber.dhs.gov/bod/18-01/
>
> Unfortunate IMO that they created this requirement based on an informational RFC.

The government agencies have a different problem -- they do it on the 
cheap with SPF only, so mail falls on the floor if it's forwarded.  I 
handle the mail for my local town government, most of which is forwarded 
to their gmail accounts, and they were losing a lot of important mail from 
the US Census.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly