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Turn off non delivery reports in exchange 2007

Does anybody know if it is possible to turn off the sending of non delivery reports for non existant recipients in exchange 2007. Because of the amount of spam sent to our domain the out queue is constanly full of NDR's waiting to be sent. I want to turn the feature off temporarily and have found instructions for exchange 2003 but 2007 seems to be saying we need an edge server to sync with the active directory. Don't really want to start doing that with a live system, surely there must be a simple tick box that says do not send NDR's or is this a step backwards in 2007.
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Mestna, thanks for that it seems worth implementing. You say in your article that valid senders misspell an address they get a bounce message. How does exchange know they are a valid sender and not a spammer simply trying various addresses. It is the NDR's in response to spam I am trying to avoid.
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Thanks experts, I have turned off NDR for now but will give the filtering a go later