On Tue, 8 Apr 2014 10:40:34 -0700, "Eckstine, Nate"
<[log in to unmask]> wrote:

>Is installing DKIM the solution?

No.  The problem is that Yahoo, in their DMARC specification for mail with a
From: ****@yahoo.com address (and other international variations like
*@yahoo.co.uk, *@ymail.com, *@rocketmail.com, etc.), chose to tell any and
all ISPs that do inbound DMARC/DKIM checking, 

 "If the mail that says From: *@yahoo.com does not come from our own servers
(defined by specific IP ranges), not only is it unreliable, and not OK, but
you should not accept it at all, but reject it."  

So the ISPs that do inbound DMARC/DKIM checking are not really at fault.
They are simply doing what Yahoo.com has told them to do.  Adding DKIM to
your LISTSERV server won't help because mail with From: *@yahoo.com will
come from the IP of your server which is not (and cannot be) in the IP range
of acceptable IPs for mail with From: *@yahoo.com to be valid. 

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