6.4.5 in the current spec specifies the following as how to report the
local_policy override from arc:

   <policy_evaluated>
     <disposition>delivered</disposition>
     <dkim>fail</dkim>
     <spf>fail</spf>
     <reason>
      <type>local_policy</type>
      <comment>arc=pass ams=d1.example d=d1.example,d2.example</comment>
     </reason>
   </policy_evaluated>

The comment is obviously completely unspecified, though maybe some
inferences can be done... though I'm not sure what it's saying myself.

Are we attempting to dictate the comment?  Or is that just an example and
it could be anything?

If anything, then folks who ingest these may need to look at a bunch, or
folks may just say arc=pass.

Is the more extensive information useful?

I came up with random format for use in the comment field for the authres
header, ie something like:

arc=pass (i=2 spf=pass spfdomain=example.com dkim=pass dkdomain=example.com)
(only partially rolled out, most servers are just saying (i=2)) but I'm not
sure that's useful directly either.

Brandon
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