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take a look here ,<br />
<a href="http://www.smartertools.com/forums/t/21015.aspx\" rel="ugc nofollow">http://www.smartertools.com/forums/t/21015.aspx\</a>
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take a look here ,
http://www.smartertools.com/forums/t/21015.aspx\ [http://www.smartertools.com/forums/t/21015.aspx\]

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When users send messages to some addresses the following error is returned<br />
<br />
Your message did not reach some or all of the intended recipients.<br />
<br />
The following recipient(s) could not be reached:<br />
<br />
&nbsp; &nbsp; &nbsp; &quot;destination e-maill&quot;' on 10/30/2008 10:17 AM<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; You do not have permission to send to this recipient. &nbsp;For assistance, contact your system administrator.<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;KTPO04.ktpo.ops #5.7.1 smtp;550 5.7.1 Client host rejected: cannot find your hostname, [our e-mail server address]&gt;<br />
<br />
We use Exchange 2003 on a MS Windows 2003 SP2 server<br />

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When users send messages to some addresses the following error is returned

Your message did not reach some or all of the intended recipients.

The following recipient(s) could not be reached:

      "destination e-maill"' on 10/30/2008 10:17 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <KTPO04.ktpo.ops #5.7.1 smtp;550 5.7.1 Client host rejected: cannot find your hostname, [our e-mail server address]>

We use Exchange 2003 on a MS Windows 2003 SP2 server


Your message did not reach some or all of the intended recipients

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

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.