Here is where Yahoo discusses the effect that it recognizes it is having on
email lists:
http://yahoomail.tumblr.com/post/82426900353/yahoo-dmarc-policy-change-what-should-senders-do

Based on the slant of this posting, I don't think they intend to back-down
from their position.  If they succeed, there is a good chance at least some
other email providers may follow this path.  

And yes, L-Soft is working on a technical solution, but it takes some time to
complete testing.

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