[exim-dev] [Bug 2162] New: Implement Authenticated Received …

https://bugs.exim.org/show_bug.cgi?id=2162

            Bug ID: 2162
           Summary: Implement Authenticated Received Chain (ARC)
           Product: Exim
           Version: N/A
          Hardware: All
                OS: All
            Status: NEW
          Severity: wishlist
          Priority: medium
         Component: DKIM
          Assignee: tom@???
          Reporter: grin@???
                CC: exim-dev@???

This has been asked with no answer on the mailing list, and it seems nobody
wanted to pick it up, so, after a fair timeout priod I note it here.

Authenticated Received Chain (ARC) is a DKIM successor (or DKIM companion if
you see it the other way): provides a way to reliably sign and seal headers up
to a point, which prevents various problems with DKIM and mailing lists,
forwarders and alike.

It is currently an IETF Standards Track draft:
https://datatracker.ietf.org/doc/draft-ietf-dmarc-arc-protocol/

It lists the following known implementations (as of now):
* mailman
* dkimpy
* OpenARC
* rspamd
* PERL Mail::Milter::Authentication
* Copernica (web)

ARC is used for more than a year now on various high traffic sites, most
notable example being Google (Alphabet, Gmail) and AOL.

Useful pointers are:
http://arc-spec.org/
https://en.wikipedia.org/wiki/Authenticated_Received_Chain

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