Is the reason my DKIM signature shows invalid because of reported hostname?

From: Mike McKoy <mikemckoy_at_gmail.com>
Date: Fri, 29 May 2015 15:35:28 -0400

I have been trying to figure out for a long time why this is reporting as
invalid. I noticed the the hostname is reported twice...the second time as
localhost which appears to be written by DKIM. Also Gmail says there is no
signature when their clearly is? Any ideas? I have mail being deferred and
rejected.

Received: by 10.36.51.18 with SMTP id k18csp184510itk;
        Fri, 29 May 2015 03:39:06 -0700 (PDT)
X-Received: by 10.42.176.8 with SMTP id bc8mr3584781icb.22.1432895946665;
        Fri, 29 May 2015 03:39:06 -0700 (PDT)
Return-Path: <info_at_mymodeltalk.com>
Received: from mymodeltalk.com (MyModelTalk.com. [52.0.148.79])
        by mx.google.com with ESMTP id f137si4136809ioe.19.2015.05.29.03.39.06
        for <mikemckoy_at_gmail.com>;
        Fri, 29 May 2015 03:39:06 -0700 (PDT)
Received-SPF: pass (google.com: domain of info_at_mymodeltalk.com
designates 52.0.148.79 as permitted sender) client-ip=52.0.148.79;
Authentication-Results: mx.google.com;
       spf=pass (google.com: domain of info_at_mymodeltalk.com designates
52.0.148.79 as permitted sender) smtp.mail=info_at_mymodeltalk.com;
       dkim=neutral (no signature) header.i=_at_mymodeltalk.com
Received: from localhost (localhost.localdomain [127.0.0.1])
        by mymodeltalk.com (Postfix) with ESMTPA id 5AC0B326E3
        for <mikemckoy_at_gmail.com>; Fri, 29 May 2015 06:39:06 -0400 (EDT)
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mymodeltalk.com;
        s=default; t=1432895946;
        bh=WmPR6hKTVpyU7fSODvKnQx+6tL+FJsF/umRbTr3mYpQ=;
        h=Date:To:From:Subject;
        b=Nl6+Cx9pT2xz8i81ohSLz8wnRTtvQaOpIXCR6xRaKagtZxGOHxmYqQNQ0CPu2N5woL/YpmU8BwshJcqHnr6KSRVdyQ0RkTbtk6paUVzXt+sEiZieZepqL+tN7oryJ8+SVA5T2A2iFCYIVf9qqW0npdcbMnr3SmMjuXQfJiI5g1Y=

--
Mike McKoy
*404.590.7176*
http://MyForeverHair.com
http://www.MyModelTalk.com
http://InCrowdUSA.net
http://www.google.com/profiles/mikemckoy
Received on Fri May 29 2015 - 19:36:27 PST

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