Hi all,
in September, I developed a mail filter more or less around Murray's idea of MLM transformations[*]. It needed MLM support. A reply on the Mailman developers mailing list[†] made it clear to me that it won't work that way. So I rewrote the filter in order to make it work in the current environment. Details are in the I-D referred below. Installed on my mail server, the filter does indeed verify some of the original signatures on this mailing list. As I'm going to release the filter in the near future, I beg of you to post constructive comments soon. In fact, hard-coded names will be difficult to change after multiple users will have installed and configured the filter. So, if something sounds indigestible, please tell me ASAP. Thanks in advance for any comment. Ale [*] https://tools.ietf.org/html/draft-kucherawy-dkim-transform [†] https://mail.python.org/archives/list/[email protected]/thread/AHHHY5XN3CAM4PFVAYSKFITFXFPL6575/ -------- Forwarded Message -------- Subject: New Version Notification for draft-vesely-dmarc-mlm-transform-00.txt Date: Mon, 16 Nov 2020 03:05:27 -0800 From: [email protected] To: Alessandro Vesely <[email protected]> A new version of I-D, draft-vesely-dmarc-mlm-transform-00.txt has been successfully submitted by Alessandro Vesely and posted to the IETF repository. Name: draft-vesely-dmarc-mlm-transform Revision: 00 Title: Mailing List Manager (MLM) Transformations Document date: 2020-11-16 Group: Individual Submission Pages: 15 URL: https://www.ietf.org/archive/id/draft-vesely-dmarc-mlm-transform-00.txt Status: https://datatracker.ietf.org/doc/draft-vesely-dmarc-mlm-transform/ Html: https://www.ietf.org/archive/id/draft-vesely-dmarc-mlm-transform-00.html Htmlized: https://tools.ietf.org/html/draft-vesely-dmarc-mlm-transform-00 Abstract: The widespread adoption of Domain-based Message Authentication, Reporting, and Conformance (DMARC) led Mailing List Managers (MLM) to rewrite the From: header field as a workaround. This document describes cases where it is possible to revert MLM transformations and hence verify DomainKeys Identified Mail (DKIM) signatures that were applied at submission time. For reliable results, some compliance is required of all agents involved, author domain signers, MLMs, forwarders, and final recipients. MLM transformation reversion reduces the DMARC's effects on indirect mail flows. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat _______________________________________________ dmarc mailing list [email protected] https://www.ietf.org/mailman/listinfo/dmarc
