554 Failure tcp_read_dot 541 540 seconds, got 0 bytes

I have an account on our surgemail server, I have changed it
and some 
other info for privacy reasons. Let's call the account 
customerdomain.com 

The customer that uses this email account says he can't get
any email 
from this one particular company anymore. It seems they are
using a 
helpdesk product called Cerberus Helpdesk and I think that's
acting as 
the mailer.

Customer wants to know why he can't get any mail from this
company 
anymore and I am kind of stumped.. Here is the bounce that
the company 
is getting back when they try to send to our Surge server.

Any advice would be greatly appreciated.

############################################################
##########################
customerdomain.com
SMTP error from remote mail server after end of data:
host mail4.mydomain.com [MySurgeIPwasHERE]: 554 Failure
tcp_read_dot 541 
540 seconds, got 0 bytes

------ This is a copy of the message, including all the
headers. ------

Return-path:
Received: from [127.0.0.1] (helo=www.clippedsupport.com)
by prometheus.clippeddns2.com with smtp (Exim 4.66)
(envelope-from )
id 1IPEqj-00080e-Gn
for customerdomain.com; Sun, 26 Aug 2007 04:56:06 -0500
MIME-Version: 1.0
Date: Sun, 26 Aug 2007 04:56:05 -0500
From: supportdedicentral.com
Subject: [DediCentral Non-Server Support #DET-71281-990]:
BIN
Reply-To: supportdedicentral.com
Message-ID: <087401c7e7c7$52641f70$f72c5e50$com>
X-Mailer: Cerberus Helpdesk v. 3.5.1 Release (Build 418) 
(http://www.cerberusweb.com
)
In-Reply-To: server.myclipped.com>
References: server.myclipped.com>
server.myclipped.com>
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 8bit
To: customerdomain.com

############################################################
##############


Regards,
Todd Routhier

Lightwave Technologies, LLC

http://www.PrestigeM
essaging.com
http://www.YourOwnISP.com
 
--
Within the US:
(888) 904-8477

Outside the US:
+1-210-881-0600