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Ref: <a href="http://support.microsoft.com/kb/284204/en-us" rel="ugc nofollow">http://support.microsoft.com/kb/284204/en-us</a><br />
<br />
NDR Code: 5.1.7<br />
First Available: Exchange 2000 Service Pack 2<br />
Possible Cause: The sender has a malformed or missing mail attribute in the directory structure. The Transport categorizer cannot deliver the mail item without a valid mail attribute.<br />
Troubleshooting: Verify the sender directory structure and determine whether the mail attribute exists. <br />
<br />
* Kindly check user attibutes from adsiedit.msc; is this mailbox was moved from another server ?? or was it migrated ??
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Ref: http://support.microsoft.com/kb/284204/en-us [http://support.microsoft.com/kb/284204/en-us]

NDR Code: 5.1.7
First Available: Exchange 2000 Service Pack 2
Possible Cause: The sender has a malformed or missing mail attribute in the directory structure. The Transport categorizer cannot deliver the mail item without a valid mail attribute.
Troubleshooting: Verify the sender directory structure and determine whether the mail attribute exists.

* Kindly check user attibutes from adsiedit.msc; is this mailbox was moved from another server ?? or was it migrated ??

<div>
Yes, this mailbox was moved from another server. I will look into the MS link you gave me.<br />
<br />
Thanks!
</div>


Yes, this mailbox was moved from another server. I will look into the MS link you gave me.

Thanks!

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<div class="content wysiwyg-content">
Here is the error message I get:<br />
<br />
Your message did not reach some or all of the intended recipients.<br />
<br />
&nbsp; &nbsp; &nbsp; Subject: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />
&nbsp; &nbsp; &nbsp; Sent: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11/30/2007 2:25 PM<br />
<br />
The following recipient(s) cannot be reached:<br />
<br />
&nbsp; &nbsp; &nbsp; System Attendant on 11/30/2007 2:25 PM<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; The e-mail address could not be found. &nbsp;Perhaps the recipient moved to a different e-mail organization, or there was a mistake in the address. &nbsp;Check the address and try again.<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;email.server.address #5.1.7&gt;<br />

</div>
</div>


Here is the error message I get:

Your message did not reach some or all of the intended recipients.

      Subject:	
      Sent:	11/30/2007 2:25 PM

The following recipient(s) cannot be reached:

      System Attendant on 11/30/2007 2:25 PM
            The e-mail address could not be found.  Perhaps the recipient moved to a different e-mail organization, or there was a mistake in the address.  Check the address and try again.
            <email.server.address #5.1.7>


System Attendant NDR when posting to calendar from OWA

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.