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Check the Exchange system manager-&gt;global settings-&gt;Internet Message format-Right click the default and go to properties-advance tab check if the NDR is enabled or not.<br />
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I would recomend you to use receipient filtering with Tarpitting.Check the below article<br />
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<a href="http://www.msexchange.org/tutorials/Hardening-Exchange-Server-2003-Environment-Part3.html" rel="ugc">http://www.msexchange.org/tutorials/Hardening-Exchange-Server-2003-Environment-Part3.html</a>
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Check the Exchange system manager->global settings->Internet Message format-Right click the default and go to properties-advance tab check if the NDR is enabled or not.



I would recomend you to use receipient filtering with Tarpitting.Check the below article

http://www.msexchange.org/tutorials/Hardening-Exchange-Server-2003-Environment-Part3.html [http://www.msexchange.org/tutorials/Hardening-Exchange-Server-2003-Environment-Part3.html]

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The NDR is not enabled, so we are puzzled as to why the NDR's are still being sent out. &nbsp;When invalid emails were being silently dropped last year, we didn't &nbsp;have any settings different that we are aware of. &nbsp;Is there another settining within exchange that could still be causing the NDR's to be sent out?
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The NDR is not enabled, so we are puzzled as to why the NDR's are still being sent out.  When invalid emails were being silently dropped last year, we didn't  have any settings different that we are aware of.  Is there another settining within exchange that could still be causing the NDR's to be sent out?

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We recently had an audit that reported invalid emails are returned rather than configured to Silent Drop as they were last year. Might have been due to a config change from a patch but you should revert back to the Silent Drop.<br />
We have verified that &quot;Allow non-delivery report&quot; was unchecked in Exchange System manager, but the NDR's are still being sent. &nbsp;Does anyone have any ideas what we are missing? &nbsp; We made no major config changes to exchange over the past year.<br />
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Thanks<br />

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We recently had an audit that reported invalid emails are returned rather than configured to Silent Drop as they were last year. Might have been due to a config change from a patch but you should revert back to the Silent Drop.
We have verified that "Allow non-delivery report" was unchecked in Exchange System manager, but the NDR's are still being sent.  Does anyone have any ideas what we are missing?   We made no major config changes to exchange over the past year.

Thanks


Non-Delivery Report Question

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.