Exchange 2007 rejecting Calendar Invites from a specific domain

We are unable to receive calendar events from a specific domain, but emails from this domain without Calendar events attached are received without a problem.  We are using Exchange 2007.

Attached is a copy of the Diagnostic information for administrators that our server is returning to the user trying to send us the Calendar events.

 

Diagnostic information for administrators:

Generating server: corp.MYDOMAIN.com

USERNAME@MYDOMAIN.com
#550 4.4.7 QUEUE.Expired; message expired ##

Original message headers:

Received: from psmtp.com (68.18.2.41) by mail.MYDOMAIN.com (10.0.0.4) with
Microsoft SMTP Server id 8.3.83.0; Fri, 13 May 2011 12:18:22 -0400
Received: from oproxy7-pub.bluehost.com ([67.222.55.9]) by
 exprod7mx201.postini.com ([68.18.6.14]) with SMTP;     Fri, 13 May 2011
12:19:38
 EDT
Received: (qmail 26634 invoked by uid 0); 13 May 2011 16:19:37 -0000
Received: from unknown (HELO host219.hostmonster.com) (74.220.215.219)  by
oproxy7.bluehost.com with SMTP; 13 May 2011 16:19:37 -0000
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=SENDING-DOMAIN.com;
 
h=Received:From:To:Subject:Date:Organization:Message-ID:MIME-Version:Content
-Type:Content-Transfer-Encoding:X-Mailer:Thread-Index:Content-Language:X-Ide
ntified-User;
 
b=A41yZ93i+UwqgiX06WV86NyZHB0L+NYVEj4QJAM7DNogbXSJkSgZ3Gbw65M5zXQ1l3CYKp4RvM
0nJswYEQSVu1XdLEl67Go25nRX06n0QY27kDD4fZ0J0YSY2XUm0WnL;
Received: from 66.83.216.162.nw.nuvox.net ([66.83.216.162] helo=AssntDir)
by
 host219.hostmonster.com with esmtpa (Exim 4.69)        (envelope-from
 <SENDING-USER@SENDING_DOMAIN.com>)   id 1QKv5T-0000dn-Eu; Fri, 13 May 2011
10:19:35
 -0600
From: SENDING USER <SENDING-USER@SENDING_DOMAIN.com>
To: <USERNAME@MYDOMAIN.com>
Subject: PAL Budget Meeting
Date: Fri, 13 May 2011 12:18:43 -0400
Organization: Police Athletic League
Message-ID: <000001cc1189$6f2550d0$4d6ff270$@Naughton@SENDING-DOMAIN.com>
MIME-Version: 1.0
Content-Type: text/calendar; method=REQUEST; charset="utf-8"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Office Outlook 12.0
Thread-Index: AcwRiW24dXOu0AW9QRW5e+iV9L4xwQ==
Content-Language: en-us
X-Identified-User: {1553:host219.hostmonster.com: palco:sendingdomain.com}
{sentby:smtp auth 66.83.216.162 authed with SENDING-USER@SENDING-DOMAIN.com}
X-pstn-neptune: 0/0/0.00/0
X-pstn-levels: (S:99.90000/99.90000 CV:99.9000 FC:95.5390 LC:95.5390
R:95.9108 P:95.9108 M:97.0282 C:98.6951 )
X-pstn-settings: 5 (2.0000:2.0000) s cv gt3 gt2 gt1 r p m c
X-pstn-addresses: from <SENDING-USER@SENDING-DOMAIN.com> [20/1]
Return-Path: SENDING-USER@SENDING-DOMAIN.com
X-TM-AS-Product-Ver: SMEX-8.0.0.1181-6.500.1024-18132.004
X-TM-AS-Result: No--11.449400-8.000000-31
X-TM-AS-User-Approved-Sender: No
X-TM-AS-User-Blocked-Sender: No

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