Email bounce back problem

I have a domain user who is having trouble sending email to recipients he's not sent to before.  The bounce back message he gets is - the recipient's destination email system is unknown or invalid -  if he receives an email from someone he's not sent to before and replies to it, the mail gets through with no problem.  What could be hanging up his mail and causing this?  
Using Exchange 2003 w/Outlook 2007 for clients.
RogerPAsked:
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gupnitConnect With a Mentor Commented:
Hi,
Please try to send mail to same email address via OWA and confirm
Thanks
Nitin
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Justin OwensITIL Problem ManagerCommented:
Could you post the bounce-back message verbatim on two or three of the errored messages?  It would also be helpful to see the message headers of the mail that was rejected.
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gupnitCommented:
Hi,
NDR details would be needed to be able to troubleshoot better
Thanks
Nitin Gupta (gupnit)
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RogerPAuthor Commented:
Bounce back message is - Your message did not reach some or all of the intended recipients.

      Subject:      GFI Maintenance Renewal
      Sent:      4/7/2009 4:09 PM

The following recipient(s) cannot be reached:

      'TFornefeld@nautilus-ins.com' on 4/7/2009 4:09 PM
            The message could not be delivered because the recipient's destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient.
            <exchange2k3.choice.local #5.1.2>

Header info -
Microsoft Mail Internet Headers Version 2.0
From: postmaster@choicecom.com
To: smull@choicecom.com
Date: Tue, 7 Apr 2009 16:09:08 -0400
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
      boundary="9B095B5ADSN=_01C9AA54C9AE1A5800005E79exchange2k3.choi"
X-DSNContext: 335a7efd - 4523 - 00000001 - 80040546
Message-ID: <9DpU0iQRQ00000009@exchange2k3.choice.local>
Subject: Delivery Status Notification (Failure)

--9B095B5ADSN=_01C9AA54C9AE1A5800005E79exchange2k3.choi
Content-Type: text/plain; charset=unicode-1-1-utf-7

--9B095B5ADSN=_01C9AA54C9AE1A5800005E79exchange2k3.choi
Content-Type: message/delivery-status

--9B095B5ADSN=_01C9AA54C9AE1A5800005E79exchange2k3.choi
Content-Type: message/rfc822

Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: application/ms-tnef;
      name="winmail.dat"
Content-Transfer-Encoding: binary
X-MimeOLE: Produced By Microsoft Exchange V6.5
Subject: GFI Maintenance Renewal
Date: Tue, 7 Apr 2009 16:09:08 -0400
Message-ID: <F87B1AEA3598894D9EDFF84A952F21FBFBD813@exchange2k3.choice.local>
X-MS-Has-Attach:
X-MS-TNEF-Correlator: <F87B1AEA3598894D9EDFF84A952F21FBFBD813@exchange2k3.choice.local>
Thread-Topic: GFI Maintenance Renewal
Thread-Index: Acm3vLXLxYt/zQ+rSyekyXLjA3Mv5w==
From: "Mull, Steve" <smull@choicecom.com>
To: "TFornefeld@nautilus-ins.com" <IMCEAMAILTO-tfornefeld+40nautilus-ins+2Ecom@choicecom.com>


--9B095B5ADSN=_01C9AA54C9AE1A5800005E79exchange2k3.choi--
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