Hi folks, Being able to reverse mailing-list message modifications to repair the message and enable digital signature verification, would resolve a significant roadblock for further DMARC deployment. Potentially it would allow better attribution of which party contributed which content in the message. I propose some ideas around reversible mailing-list message modifications in: https://datatracker.ietf.org/doc/html/draft-chuang-mailing-list-modifications-00. These modifications are: 1) prepending a description string to the Subject header, 2) rewriting the From header, 3) removing the original DKIM-Signature and 4) appending a footer to the message body. (Apologies that -00 draft is still in a rough form)
The idea of tolerating mailing-list modification by applying a reversible transform has been proposed before such as: https://datatracker.ietf.org/doc/draft-kucherawy-dkim-transform/ The approach in draft-chuang-mailing-list-modifications is to take a smaller subset of the mailing-list changes in the transform draft but add more descriptive detail around the changes. It also builds on top of ARC to tolerate multiple mailing-lists and uses draft-chuang-replay-resistant-arc to provide path authentication. -Wei
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