How to prevent NDR messages to be forwarded to external (SMTP) email address on Exchange 2007

I have setup a mailbox account with valid and functional email account. He also have a private external email address @gmail.com.

All messages that are received mailbox@exchange.tld are forwarded to mailbox@gmail.com.
I need to configure Exchange 2007 CAS to stop forwarding  only NDR emails to external address.
How can i do that?
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Ivica VugrinecAsked:
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endital1097Connect With a Mentor Commented:
yes, system messages are not processed by rules agents
http://technet.microsoft.com/en-us/library/bb124703.aspx
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endital1097Commented:
you would need to create a transport rule that uses his external contact as the recipient and the subject containing "Undeliverable:"
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Ivica VugrinecAuthor Commented:
No, i just tryed your advice - NDR messages are still forwarded. I tryed also some diffrent combinations of "subject" words but it just doesnt work for me. Any other advice?
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endital1097Commented:
i tested too, and I don't think it is possible with system generated messages
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Ivica VugrinecAuthor Commented:
So, is the final "solution" - it can not be done (on exchange)?
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