procmail, was autoresponding to Yahoo DMARC breakage

[mfidelman at meetinghouse.net (Miles Fidelman)]

All this talk about procmail leads me to ask:

- has anybody come up with a procmail recipe, or other mechanism to 
validate DKIM-signed mail and apply an Original-Authentication-Results 
header, at the MTA level?
- if so, does it work with Yahoo mail directed to mailing lists?
- if yes, can you share?!

(So far, all the folks I know who are trying to react, have been doing 
so via hacks to their list management software.  I'm hoping to attack 
the problem at a more accessible step in mail processing).

-- 
In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra