RDNS failed when using BLAT

[Kgarthr]

I run an organization where customer emails are extremely time sensitive and important in nature. Currently our exchange server is sending emails to all domains. however when I use our customer email server to relay through our exchange server I get the following headers and our mail is trashed into spam filters and or blocked. I need a pointer or two.
Received: from mail.abc.com ([64.xx.xx.xx])
by sccrmxc19.comcast.net (sccrmxc19) with SMTP
id <20061011140714s1900ipi87e>; Wed, 11 Oct 2006 14:07:14 +0000
X-Originating-IP: [64.xx.xx.xx]
Received: from anypc-ws-client.abc.com ([192.xx.xx.137] RDNS failed) by mail.abc.com with Microsoft SMTPSVC(6.0.3790.1830);
Wed, 11 Oct 2006 10:07:04 -0400
Date: Wed, 11 Oct 2006 10:07:05 -0400
From: xxxxxxxxxx@abc.com
To: xxxxxxxxxxx@COMCAST.NET
Organization: xxxxxxxxxxx
Return-Path: <xxxxx@abc.com>
Message-ID: <01c6ed3e$Blat.v2.5.0$87e796ed$1494@192.xx.0.101>
Subject: ACTIVITY_REPORT
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="=_BlatBoundary-MKRQGKmVyDW8TLF0qEO9R"
X-OriginalArrivalTime: 11 Oct 2006 14:07:04.0934 (UTC) FILETIME=[87D5F860:01C6ED3E]