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Re: [dmarc-ietf] ARC Multi Proposal

"John R Levine" <johnl@taugh.com> Fri, 02 November 2018 09:07 UTC

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Date: Fri, 02 Nov 2018 16:07:03 +0700
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From: John R Levine <johnl@taugh.com>
To: "Kurt Andersen (b)" <kboth@drkurt.com>
Cc: "dmarc@ietf.org" <dmarc@ietf.org>, Scott Kitterman <sklist@kitterman.com>
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Subject: Re: [dmarc-ietf] ARC Multi Proposal
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> It seems like a poor implementation choice to be enforcing something which
> is not part of the spec :-), especially when there are parenthetical
> comments and references to things like ARC-MULTI to warn you against
> leaping to foot-shooting enforcement choices.

Here's what the spec says:

    3.  Validate the structure of the Authenticated Received Chain.  A
        valid ARC has the following conditions:

        1.  Each ARC Set MUST contain exactly one each of the three ARC
            header fields (AAR, AMS, and AS).

I don't see where it says "except you can ignore the ones that don't 
validate particularly if they have funky algorithms."

The perl ARC module checks for dup headers and I don't think that's 
unusual.

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

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