Appspot failure "does not designate permitted sender hosts"

[Rob Cochran]

I have a very simple app that will take an Email and shoot the contents to my website in PHP.  This is for a CMMS website where users can open workorders through an Email.  Have not had any problems until just recently.  A user in Australia cannot create workorders and gets a failure message which is attached below.  It looks like the main failure is "does not designate permitted sender hosts".  What does this mean and is there a way to fix this?

-----Original Message-----
From: Mail Delivery Subsystem [mailto:mailer...@google.com] 
Sent: 17 April 2014 10:01 AM
To: 31ShOUwILB_4pvvngxs.iu.5gyy...@smtp-in.bounces.google.com
Subject: Delivery Status Notification (Failure)

Delivery to the following recipient failed permanently:

     ss-...@XXXXX.appspotmail.com

----- Original message -----

X-Received: by 10.236.141.203 with SMTP id g51mr2717832yhj.24.1397631189850;
        Tue, 15 Apr 2014 23:53:09 -0700 (PDT)
Return-Path: <j...@XXXX.co.za>
Received: from gator3266.hostgator.com (gator3266.hostgator.com. [XXX.XX.XXX.230])
        by gmr-mx.google.com with ESMTPS id h6si5732979iga.0.2014.04.15.23.53.09
        for <ss-...@XXXXX.appspotmail.com>
        (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Tue, 15 Apr 2014 23:53:09 -0700 (PDT)
Received-SPF: none (google.com: j...@XXXXX.co.za does not designate permitted sender hosts) client-ip=XXX.XX.XXX.230;
Authentication-Results: gmr-mx.google.com;
       spf=neutral (google.com: j...@XXXXX.co.za does not designate permitted sender hosts) smtp.mail=j...@XXXXX.co.za
Received: from dedi22.flk1.host-h.net ([188.40.0.72]:32778)
	by gator3266.hostgator.com with esmtps (UNKNOWN:DHE-RSA-AES128-SHA:128)
	(Exim 4.82)
	(envelope-from <j...@XXXX.co.za>)
	id 1WaJiW-0004Uv-0T
	for work_...@XXXXX.com; Wed, 16 Apr 2014 01:53:08 -0500
Received: from [XXX.XXX.XX.28] (helo=XXXX.dyndns.org)
	by dedi22.flk1.host-h.net with esmtpa (Exim 4.80)
	(envelope-from <j...@XXXX.co.za>)
	id 1WaJiT-0003Py-OC
	for work_...@XXXXX.com; Wed, 16 Apr 2014 08:53:06 +0200
Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: multipart/alternative;
	boundary="----_=_NextPart_001_01CF5940.81213ED9"
Subject: 
X-MimeOLE: Produced By Microsoft Exchange V6.5
Date: Wed, 16 Apr 2014 08:52:43 +0200
Message-ID: <1BFB42CAB5FC5647A41...@XXXX.XXXX.local>
X-MS-Has-Attach: 
X-MS-TNEF-Correlator: 
thread-index: Ac9ZQHe2CSqtAlKWQ4KmDHEuRaNrvg==
From: "Jean-Pierre Sander" <j...@XXXX.co.za>
To: <work_...@XXXXX.com>
X-Authenticated-Sender: za...@XXXX.co.za
X-Virus-Scanned: Clear (ClamAV 0.98.1/18798/Tue Apr 15 10:43:39 2014)
X-AntiAbuse: This header was added to track abuse, please include it with any abuse report
X-AntiAbuse: Primary Hostname - gator3266.hostgator.com
X-AntiAbuse: Original Domain - ss-cmms.com
X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse: Sender Address Domain - XXXX.co.za
X-BWhitelist: no
X-Source-IP: 188.40.0.72
X-Exim-ID: 1WaJiW-0004Uv-0T
X-Source: 
X-Source-Args: 
X-Source-Dir: 
X-Source-Sender: dedi22.flk1.host-h.net [188.40.0.72]:32778
X-Source-Auth: 
X-Email-Count: 0

Check Alarms

[Mars Lan]

Appears to be a SPF configuration error:

http://social.technet.microsoft.com/Forums/exchange/en-US/598f9226-d397-4d89-b195-0e05b0da3942/receivedspf?forum=exchangesvradminlegacy

01CF5940.81213ED9"
Subject: 
X-MimeOLE: Produced By Microsoft Exchange V6.5
Date: Wed, 16 Apr 2014 08:52:43 +0200
Message-ID: <1BFB42CAB5FC5647A412B97A17C9F1E2DF...@XXXX.XXXX.local>
X-MS-Has-Attach: 
X-MS-TNEF-Correlator: 
thread-index: Ac9ZQHe2CSqtAlKWQ4KmDHEuRaNrvg==
From: "Jean-Pierre Sander" <j...@XXXX.co.za>
To: <work_...@XXXXX.com>
X-Authenticated-Sender: za...@XXXX.co.za