Here’s what happens:

Posts from DMARC enabled ISPs (Yahoo, SBCGlobal, AT&T, Comcast, Rogers…) will be delivered to non-DMARC enabled ISP users.

Posts from DMARC enabled ISPs will NOT be delivered to other DMARC enabled ISP users.

Posts from NON-DMARC enabled ISPs WILL be delivered to DMARC enabled ISP users.

Posts from DMARC enabled ISPs WILL be delivered to NON-DMARC enabled users.

It’s really crazy, and I’m sure it’s not what was intended.

best regards,
Larry Finch
Site manager, HMSSurprise.org

On Apr 10, 2014, at 6:38 PM, CK <[log in to unmask]> wrote:

> OK Ben.. I'm a litle lost.. I made a post to a list.. not using gmail
> or yahoo.. or sbcglobal.. or any of those.. and it bounced from every
> single facebook/att/sbsglobal subscriber to the list.. so is it posts
> from? or to? or both? and do you see a fix in sight for this new set
> of problems? with hotmail et al.. now yahoo et al affected.. that
> pretty much decimates many of our email lists.
> 
> Thanks..
> 
> 
> On 4/10/14, Ben Parker <[log in to unmask]> wrote:
>> 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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