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it simply means that the receiving email server rejected your email, if you have the rest of the NDR maybe we can help more.<br />
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is this user hosted on your mail server or a 3rd party ?
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I answered the question - you cannot change the NDR.
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Online (Online@--.com)<br />
Your message wasn't delivered because the recipient's e-mail provider rejected it.<br />
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Who can help &nbsp;me to change the above text to something more meaningful to the user.
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Online (Online@--.com)
Your message wasn't delivered because the recipient's e-mail provider rejected it.


Who can help  me to change the above text to something more meaningful to the user.

Delivery has failed to these recipients or groups:

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.

Exchange

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.