Re: [dmarc-ietf] Ticket #42 - Expand DMARC reporting URI functionality

John R Levine <johnl@taugh.com> Thu, 31 December 2020 15:37 UTC

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Date: 31 Dec 2020 10:37:38 -0500
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From: "John R Levine" <johnl@taugh.com>
To: "Alessandro Vesely" <vesely@tana.it>, dmarc@ietf.org
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Subject: Re: [dmarc-ietf] Ticket #42 - Expand DMARC reporting URI functionality
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On Thu, 31 Dec 2020, Alessandro Vesely wrote:

> On Wed 30/Dec/2020 22:23:20 +0100 John R Levine wrote:
>> [ add ruap= to allow https in preference to mailto ]
>
> I still like better sticking to a unique tag (rua=) and applying OR-slashes. 
> With a comma, it is backward compatible:
>
> v=DMARC1; p=none; rua=mailto:local@example.com, mailto:report@service.example, /https://service.example/report/;

No, it's invalid according to the syntax in RFC 7489.  We have no idea 
what existing implementations do with DMARC records with syntax errors.

Here's an experiment -- put that slash syntax in the rua= in your DMARC 
record and see who does or doesn't continue sending reports.

In the meantime, anyone else have an opinion either way about adding HTTPS 
reporting?

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