Okay, I have implemented DKIM on the postfix mail server, and all of the issues 
I was reporting have been resolved.

I apologize for denigrating DMARC and am chagrined at my failure to RTFM and 
implement DKIM.

But most of all, a big THANK YOU to Franck and other responders for setting me 
on the right path.

Paul


On Apr 26, 2014, at 9:58 PM, Franck Martin <[email protected]> wrote:

> Paul,
> 
> To me it seems because your mail server breaks DKIM when forwarding. DMARC 
> relies on DKIM not getting broken in your scenario.
> 
> Here what I propose you.
> 1) open an email account at gmail
> 2) open an email account at yahoo
> 3) acquire a private domain and get it to relay all mails to the yahoo account
> 4) send an email from the gmail account to the private domain
> 5) check the authentication results on the email you received at gmail
> 6) see that DKIM was broken
> 7) fix your mail server until DKIM does not break
> 
> If you tell us what mail server you use to forward, may be we can point you 
> to some information on how to preserve DKIM.
> 
> How that sounds?

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