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Have you got recipient filtering enabled?<br />
If not then I would enable that. <a href="http://www.amset.info/exchange/filter-unknown.asp" rel="ugc">http://www.amset.info/exchange/filter-unknown.asp</a><br />
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However it could also be spoofing. The real target would be in the BCC field which you cannot see. <br />
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Simon. 
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Have you got recipient filtering enabled?
If not then I would enable that. http://www.amset.info/exchange/filter-unknown.asp [http://www.amset.info/exchange/filter-unknown.asp]

However it could also be spoofing. The real target would be in the BCC field which you cannot see.

Simon.

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Thank you Kjanicke.. thats exactly what was not enabled...wonder why.. Anyway thats for the replies guys!
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Thank you Kjanicke.. thats exactly what was not enabled...wonder why.. Anyway thats for the replies guys!

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New to Exchange 03 administration here.. I was checking the Postmaster box this morning and discovered quite a few emails there with the wrong domain specified... .com instead of .net. &nbsp;I had assumed Exchange would send an NDR since they're addressing there emails technically to the wrong recipient, but I don't think it is. &nbsp;Is there anyway in Exchange System Manager that I can verify the NDR config?<br />
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Thanks!
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New to Exchange 03 administration here.. I was checking the Postmaster box this morning and discovered quite a few emails there with the wrong domain specified... .com instead of .net.  I had assumed Exchange would send an NDR since they're addressing there emails technically to the wrong recipient, but I don't think it is.  Is there anyway in Exchange System Manager that I can verify the NDR config?

Thanks!

Verifying NDR configuration?

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.