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Re: [dmarc-ietf] ARC usage, was Call for Adoption: DMARC Use of the RFC5322.Sender Header Field

John Levine <johnl@taugh.com> Tue, 06 October 2020 15:20 UTC

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From: John Levine <johnl@taugh.com>
To: dmarc@ietf.org
Cc: vittorio.bertola@open-xchange.com
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Subject: Re: [dmarc-ietf] ARC usage, was Call for Adoption: DMARC Use of the RFC5322.Sender Header Field
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In article <1265372281.9984.1601969016735@appsuite-gw1.open-xchange.com> you write:
> It would be much better if there were a few professional/community efforts to build reliable and complete lists of good
> and bad ARC intermediaries, like for spam.

Having tried and failed to build a whitelist for Spamhaus, I can tell
you that it's hopeless.

The bar for ARC to be usable is pretty low. It's not "doesn't send
spam" or even "knows who its users are." It's only "doesn't lie about
where mail came from."  I expect that in practice the usual DNSBLs
will be good enough.

R's,
John

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