Delivery Status Notification (Failure)

I can't seem to send a message to a particular address at, and I know the address is valid.  Normally I would think this was something on their end, but  it was also brought to my attention that another individual at NREL tried to send me a couple of messages yesterday, and they bounced back to him.  Any idea what is going on? Here are error messages:

Received: from ([]) by with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2653.13)
      id GVLSXSGX; Fri, 26 Mar 2004 10:04:20 -0500
Date: Fri, 26 Mar 2004 08:03:31 -0700
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
X-DSNContext: 335a7efd - 4458 - 00000001 - 80040546
Message-ID: <>
Subject: Delivery Status Notification (Failure)

This is a MIME-formatted message.  
Portions of this message may be unreadable without a MIME-capable mail program.

Content-Type: text/plain; charset=

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

Content-Type: message/delivery-status

Reporting-MTA: dns;
Received-From-MTA: dns;
Arrival-Date: Fri, 26 Mar 2004 08:03:31 -0700

Final-Recipient: rfc822;
Action: failed
Status: 5.1.1

Content-Type: message/rfc822

Received: from ([]) by with Microsoft SMTPSVC(5.0.2195.6713);
       Fri, 26 Mar 2004 08:03:31 -0700
Received: (from daemon@localhost)
      by (8.11.7p1+Sun/8.11.6) id i2QF3Vt03287
      for; Fri, 26 Mar 2004 08:03:31 -0700 (MST)
Received: from ( [] (may be forged))
      by (8.11.7p1+Sun/8.11.6) with ESMTP id i2QF3T903283
      for <>; Fri, 26 Mar 2004 08:03:30 -0700 (MST)
Received: by with Internet Mail Service (5.5.2653.19)
      id <GVLSXSGS>; Fri, 26 Mar 2004 10:04:10 -0500
Message-ID: <>
X-PH: V4.4@nrel
From: Shen Lu <>
To: "''" <>
Cc: Jeff Smith <>
Subject: Test
Date: Fri, 26 Mar 2004 10:04:09 -0500
MIME-Version: 1.0
X-Mailer: Internet Mail Service (5.5.2653.19)
Content-Type: text/plain;
X-OriginalArrivalTime: 26 Mar 2004 15:03:31.0747 (UTC) FILETIME=[80C6DF30:01C41343]

I am testing if you can get this message. Please reply. Thanks.

Who is Participating?
ktuffner00Connect With a Mentor Commented:
this means that it cannot send mail to this user.  sometimes the user is either disabled or no longer on this server.

Is that a valid mail server for them.

here is what the 5.1.1 error code means -
recepitent could nto be resolved. check the destination address and try resending the message.
Have you tried sending via a manual telnet session to the destination host from your server?  A "user unknown" error would accompany an NDR for an unresolved mailbox.

I can show you how to telnet if you need it.

slu2003Author Commented:
Thanks for your help. I found the reason. That company has two Exchange servers. The first one is active and the one I told you. It is no problem to ping or telnet it. But the email account were moved from the first one to the second one. Now the second one was down. That is the whole store. The problem is on the other end.
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