[dmarc-ietf] RESENT fields?

"Douglas E. Foster" <fosterd@bayviewphysicians.com> Wed, 07 October 2020 02:46 UTC

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From: "Douglas E. Foster" <fosterd@bayviewphysicians.com>
To: "dmarc@ietf.org" <dmarc@ietf.org>
Date: Tue, 06 Oct 2020 22:46:39 -0400
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Subject: [dmarc-ietf] RESENT fields?
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Are the RESENT fields from RFC 5322 an interesting idea that everybody has ignored?    For purposes of this discussion, they interest me because they provide a way of documenting changes to the SMTP sender, the From Header, and the recipient list.  RFC 5322 Section 3.6.6 says they SHOULD by added whenever a message is re-introduced to the transport system.   Mailing list activity seems to fit the language and intent of this section.   But I do not see any RESENT fields on the most recent posts to this list.   In fact, I am not sure that I have ever seen a message anywhere with these fields.

Application:
For forwarded messages, I don't want to trust the forwarder's spam filter, so I want to reconstruct the message identity as it appeared when the message entered the forwarder's ADMD.   The Resent fields would allow that logic to be developed, but I would also need forwarders to use those fields.   The usage would also need to apply to auto-forwarders, even though they are explicitly exempted from the RESENT header recommendation in the current RFC.

Doug Foster