Exchange 2007 NDR's

Hi All

Running Exchange 2007 SP2. We have multiple AD sites, each with their own Hub Transport servers and mailbox servers.

At the moment, if someone emails sdfsfsefse@mydomain.com (i.e. a invalid address within my domain), the sender is sent an NDR.

Does anyone know where it's set what sort of NDR's are sent back to the sender?

Our Security team wants us to look into sending NDR's for some sort of message rejection and not for others. I understand there can be several reasons a message is bounced back - mailbox too full, invalid address etc.
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Joe_BuddenAsked:
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AkhaterConnect With a Mentor Commented:
There is no way to block specific ndrs only they are either allowed or not

To disable them

Open the Exchange Management Console
Expand the Organization Configuration folder
Click on Hub Transport
Select Remote Domains
Right-click the Default tab
Click on the Message Format
to turn off NDR's uncheck Allow non-delivery reports

However ndr are part of the rfc, disabling them is a step towards beeing blacklisted
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Glen KnightCommented:
The NDR's are system generated and used for diagnostics.  As far as I am aware there is no way to change them.
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Joe_BuddenAuthor Commented:
Thanks both.

Our Security team are wondering if it's possible to disable NDR's for when someone external sends to an invalid internal address. I assume this is not possible, unless we disable ALL NDRs, and would also be counter-productive?
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AkhaterCommented:
It is possible but not recomended

You can do it with a transport rule
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Joe_BuddenAuthor Commented:
So you are saying that it IS possible to block some NDR's and not others, via a Transport rule?
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AkhaterCommented:
It is not exactly a feature fom exchange but you can do it

Do a transport rule along the lines of

Sent from internal orgaization to outside my organization

Where body contains text "some speciffic text from the ndr"

Sikently drop message
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