Hi Andreas, The exim spec (https://github.com/Exim/exim/blob/master/doc/doc-txt/experimental-spec.txt) reckons that RFC 8617 was published 2019/06 - which is now over 6 years ago. The errata looks reasonable and it seems nobody has spun up a new RFC to replace this with something even better. Somewhat that doesn't feel like experimental and "new stuff" really. And also exim users seem to have been running that code for quite some time now - without real indication of problems, malfunction or bugs from all I can find on the public search engine results.
As currently SPF/DMARC/DKIM and co. are seeing more emphasis (e.g. BSI pushing for more secure email) - what's upstream's position on revising thestatement that the ARC is considered not ready for primtime?
Best regards, Kilian
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