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Re: [dmarc-ietf] Signaling MLMs

John Levine <johnl@taugh.com> Thu, 13 April 2023 20:34 UTC

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From: John Levine <johnl@taugh.com>
To: dmarc@ietf.org
Cc: superuser@gmail.com
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dmarc/NM6VCuxs_yV8YOXt9ZROmu5euxI>
Subject: Re: [dmarc-ietf] Signaling MLMs
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It appears that Murray S. Kucherawy  <superuser@gmail.com> said:
>(1) MLMs don't necessarily want to start doing DNS queries.  They operate
>just fine never touching the DNS today; this is a new dependency and bunch
>of stuff they have to learn to apply and suppot.

Depends how they're set up.  In the common case that the inbound MTA adds an A-R
header, it can get the DMARC policy there.  That's how my dmarc.fail shim works.

>(2) An author domain can decide to affix this at its discretion, ...

The basic problem is that author domains lie about their policy, i.e.,
p=none but they expect mailing lists to work, and their users are
stuck.

R's,
John

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