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I am trying to send emails to a user. &nbsp;The mails bounces back with the following NDR:-<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;&nbsp;***<br />
&nbsp; &nbsp; &nbsp; Sent: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;***<br />
<br />
The following recipient(s) cannot be reached:<br />
<br />
&nbsp; &nbsp; &nbsp; user (user@xyz.com) on 11/10/2008 11:24 AM<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; There was a SMTP communication problem with the recipient's email server. &nbsp;Please contact your system administrator.<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;mydomain.com #5.5.0 smtp;550 No such user - psmtp&gt;<br />
<br />
<br />
Please Help!
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I am trying to send emails to a user.  The mails bounces back with the following NDR:-

Your message did not reach some or all of the intended recipients.

      Subject:	 ***
      Sent:	***

The following recipient(s) cannot be reached:

      user (user@xyz.com) on 11/10/2008 11:24 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <mydomain.com #5.5.0 smtp;550 No such user - psmtp>


Please Help!

PSMTP No Such User

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.