[dmarc-ietf] Question regarding RFC 8617

["Weist, Bill" <[e-mail]>]

DOI:  10.17487/RFC8617

The inclusion of the address headers in the signature, and possibly the Subject, is an issue:

ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=;

If a downstream server needs to modify either of these two values, the signature check fails.

It is my understanding that the Authenticated Received Check signature is to validate the chain of possession.  As such, in my opinion, the signature should only include immutable references.

In my opinion, there is value in NOT requiring headers to be stripped by downstream servers, thus maintaining the custody chain from origination to destination.

Thank you for your time and attention,

William M. Weist
Enterprise Architect I - Global Messaging - Mobile and Presence
CIO Team - End User Computing
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