Can you tell me who is blocking this email?

I have a new client that we are replacing their old SBS 2003 server with a Windows Server 2012 and Exchange 2013 (both running as guest OSs in Hyper-V).

They have a fax machine that gets faxes from students signing up for a class.  The fax machine would then email the incoming fax from panasonicfax@clientdomain.org to inboundfax@clientdomain.org.

But, something is blocking the emails from the fax machine (panasonicfax@clientdomain.org) to inboundfax@clientdomain.org.

Here is the latest refusal message that I got when I checked the panasonicfax.com's email inbox after it tried to email a fax to inboundfax@clientdomain.com.

Delivery has failed to these recipients or groups:
inboundfax@clientdomain.org
A problem occurred while delivering this message to this email address. Try sending this message again. If the problem continues, please contact your helpdesk.
The following organization rejected your message: [5.10.67.142].
Diagnostic information for administrators:
Generating server: omx.cbeyond.com
inboundfax@clientdomain.org
[5.10.67.142] #<[5.10.67.142] #5.0.0 smtp; 5.1.0 - Unknown address error 550-'5.7.1 Recipient rejected (R4)' (delivery attempts: 0)> #SMTP#
Original message headers:
X-SBRS: 5.6
X-HAT: Sender Group CUSTOMER_RELAY, Policy $RELAY applied.
X-Hostname: omx08bay.sys.cbeyond.net
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: AtoKAIVQQ1JFD2PmnGdsb2JhbABbJ4FKBAGBSUaBPYEyvygOAQEBAQEIFAk8gicBSUUHCkEYLAMniAaad6FIj26EBwOJOIZuh1WRGIQiHg
X-IronPort-AV: E=Sophos;i="4.90,980,1371096000";
   d="pdf'?scan'208";a="38233034"
Received: from mail.clientdomain.org (HELO SC750B01) ([95.16.124.55])  by
 omx.cbeyond.com with ESMTP; 25 Sep 2013 17:11:24 -0400
Date: Wed, 25 Sep 2013 04:59:09 -0500
To: inboundfax@clientdomain.org
From: "panasonicfax@" <clientdomain.org panasonicfax@clientdomain.org>
Sender: panasonicfax@clientdomain.org
Reply-To: panasonicfax@clientdomain.org
Subject: Forwarded Image from:
Message-ID: 20130925045909.101A.PANASONICFAX@clientdomain.org
X-Mailer: Network Scanner System
MIME-Version: 1.0
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

The client has a mail washing service that all inbound and outbound emails pass through.  the 5.10.67.142 ip in the quoted text is the real IP address of the mail washing service.

The 95.16.124.55 IP is the external email address of the client (actually changed to protect the client - but you know what I mean).

When the fax machine sends an email, it goes out via Cbeyond's (their phone line/fax line/internet provider) SMTP relay over land lines to the GFI mail washing service then to the on-site exchange 2013 and (I suppose) into the proper mailbox.

Can you tell me where the email is being rejected?  It looks like it is being rejected by the mail washing service at 5.10.67.142 to me.

Am I reading this right?  Is 5.10.67.142 rejecting the email?
asciiassasinAsked:
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asciiassasinAuthor Commented:
Seems to me that this GFI KB (GFI provides the mail washing back end for the people washing the client's emails) shows that GFI (5.10.67.142) is the one rejecting the email.

But when we advised the company providing the mail washing service that they probably needed to add the inbound@clientdomain.org email alias to their software - the owner replied that he was at a trade show right now and that he tried to log in to our Exchange OWA interface and he couldn't.  

The good people at GoDaddy could log into our OWA from outside.  I could log into the OWA using a cellular hotspot.  Client's president also logged into OWA from outside using his own cellular hotspot.

I just think this mail washing company doesn't give a crap about the client.
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asciiassasinAuthor Commented:
After speaking with Cbeyond and running some tests, it seems that it is indeed the GFI servers used by the mail washing service.
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asciiassasinAuthor Commented:
I got it figured out.
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