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 [IQVIA logo_96dpi_100pxheight] Learn more<http://www.iqvia.com/> about IQVIA(tm) 400 Campus Drive Collegeville, PA 19426 USA O: +1 610 244 2646 | M: +1 484 904 8244 ________________________________________ IMPORTANT - PLEASE READ: This electronic message, including its attachments, is CONFIDENTIAL and may contain PROPRIETARY or LEGALLY PRIVILEGED or PROTECTED information and is intended for the authorized recipient of the sender. If you are not the intended recipient, you are hereby notified that any use, disclosure, copying, or distribution of this message or any of the information included in it is unauthorized and strictly prohibited. If you have received this message in error, please immediately notify the sender by reply e-mail and permanently delete this message and its attachments, along with any copies thereof, from all locations received (e.g., computer, mobile device, etc.). To the extent permitted by law, we may monitor electronic communications for the purposes of ensuring compliance with our legal and regulatory obligations and internal policies. We may also collect email traffic headers for analyzing patterns of network traffic and managing client relationships. For further information see: https://www.iqvia.com/about-us/privacy/privacy-policy. Thank you.
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