spam scores for reverse DNS

Hi Guys,

I am sending two emails from the same system.  One of these emails is giving me extra spam penalty scores for failed reverse DNS tests. The header of that email is:

=======================

Return-Path: <apache@120400-www.myDomain.com>
Received: from gate9.gate.sat.mlsrvr.com (gate9.gate.sat.mlsrvr.com [192.168.1.34])
by mail7a.mail.sat.mlsrvr.com (SMTP Server) with ESMTP id ECE301B4002
for <y.musmar@myDomain.com>; Thu, 18 Oct 2007 02:05:55 -0400 (EDT)
Received: from gate12.r4.iad.mlsrvr.com (iad3.emailsrvr.com [207.97.227.217])
by gate9.gate.sat.mlsrvr.com (SMTP Server) with ESMTP id DE6E1590007
for <y.musmar@myDomain.com>; Thu, 18 Oct 2007 02:05:55 -0400 (EDT)
X-Virus-Scanned: OK
X-Spam-Flag: YES
X-Spam-Score: 8.112
X-Spam-Level: ********
X-Spam-Status: Yes, score=8.112 tagged_above=-100 required=6
tests=[BACKUP_MX=2.801, HTML_MESSAGE=0, HTML_MIME_NO_HTML_TAG=1.052,
MIME_HEADER_CTYPE_ONLY=0.856, MIME_HTML_ONLY=0, RDNS_NONE=0.1,
REVDNS_1=1.801, REVDNS_2=0.501, URIBL_DNSBL_BLAGR3=1.001]
X-Connected-To: mx2
X-Originating-Ip: [IP Address]
Received: from 120400-www.myDomain.com (myDomain.com [IP Address])
by gate12.r4.iad.mlsrvr.com (SMTP Server) with ESMTP id 51BC8528221
for <y.musmar@myDomain.com>; Thu, 18 Oct 2007 02:05:55 -0400 (EDT)
Received: from 120400-www.myDomain.com (localhost [127.0.0.1])
by 120400-www.myDomain.com (Postfix) with ESMTP id 57EBF9C4FE
for <y.musmar@myDomain.com>; Thu, 18 Oct 2007 01:05:10 -0500 (CDT)
DomainKey-Signature: a=rsa-sha1; h=Received:To:Subject:From:X-Sender:Content-Type:Message-Id:Date; b=Bfv4c7y2sMiczJdFcpTHnHTMff26yM18Ua2IE1BKjimaUCA+6CBaBL69uQfH93/cYVRQVuRLYP6Zm++BrYaOFJ8XZB2Mmp8aGzN8vJxZ2ozFsw7kRbe3Byjb7IpOD8UggLPgyr6zh3g1uL5OLKFruzOkY/I5PdtEkwbNO35mKSg=; c=nofws; d=myDomain.com; q=dns; s=private
Received: by 120400-www.myDomain.com (Postfix, from userid 48)
id 556929C4FF; Thu, 18 Oct 2007 01:05:10 -0500 (CDT)
To: y.musmar@myDomain.com
Subject: [SPAM] Your MyDomain.com Account Information
From: "MyDomain.com" <no-reply@myDomain.com>
X-Sender: <no-reply@myDomain.com>
Content-Type: text/html; charset=iso-8859-1
Message-Id: <20071018060510.556929C4FF@120400-www.myDomain.com>
Date: Thu, 18 Oct 2007 01:05:10 -0500 (CDT)

===================================


However, the other email is passing the tests with no issues, and the header of that email is:

===================================

Return-Path: <apache@120400-www.myDomain.com>
Received: from gate4.gate.sat.mlsrvr.com (gate4.gate.sat.mlsrvr.com [192.168.1.29])
by mail7a.mail.sat.mlsrvr.com (SMTP Server) with ESMTP id 39C6B1B4002
for <y.musmar@myDomain.com>; Thu, 18 Oct 2007 02:55:24 -0400 (EDT)
X-Virus-Scanned: OK
X-Spam-Flag: NO
X-Spam-Score: 2.909
X-Spam-Level: **
X-Spam-Status: No, score=2.909 tagged_above=-100 required=6
tests=[HTML_MESSAGE=0, HTML_MIME_NO_HTML_TAG=1.052,
MIME_HEADER_CTYPE_ONLY=0.856, MIME_HTML_ONLY=0,
URIBL_DNSBL_BLAGR3=1.001]
X-Originating-Ip: [IP Address]
Received: from 120400-www.myDomain.com (myDomain.com [IP Address])
by gate4.gate.sat.mlsrvr.com (SMTP Server) with ESMTP id A34CA590007
for <y.musmar@myDomain.com>; Thu, 18 Oct 2007 02:55:23 -0400 (EDT)
Received: from 120400-www.myDomain.com (localhost [127.0.0.1])
by 120400-www.myDomain.com (Postfix) with ESMTP id 7AE6F9C5D9
for <y.musmar@myDomain.com>; Thu, 18 Oct 2007 01:55:23 -0500 (CDT)
DomainKey-Signature: a=rsa-sha1; h=Received:To:Subject:From:X-Sender:Content-Type:Message-Id:Date; b=LH1gaqzjo4BhTm/1Sem4cWDvP7MXYnBStPc5vn5zet4A6jwLDKruEvZ5byPJF3PgY4QEcKoxjZf+blbzQm0v/8ZfOIu79MDn6cDAEvYlKYxmYDiPLb8597uaCPE374P8BQ3Ex5GDoRGvEI1Zlin6KD6evzpAdlc5N+v8p5EEI94=; c=nofws; d=myDomain.com; q=dns; s=private
Received: by 120400-www.myDomain.com (Postfix, from userid 48)
id 792609C5DC; Thu, 18 Oct 2007 01:55:23 -0500 (CDT)
To: y.musmar@myDomain.com
Subject: Your Employer Account on MyDomain.com
From: Yasmin Musmar <EmployerSupport@myDomain.com>
X-Sender: <y.musmar@myDomain.com>
Content-Type: text/html; charset=iso-8859-1
Message-Id: <20071018065523.792609C5DC@120400-www.myDomain.com>
Date: Thu, 18 Oct 2007 01:55:23 -0500 (CDT)

===============================

Both emails are sent from the same server with the same reverse DNS settings. Would you know why we are facing this problem with one of the emails and not the other? And how can we solve that and pass the reverse DNS tests?