How trigger NDR in ZIMBRA if mail looping happens between ZIMBRA and EXCHANGE

[darth_vader]

Dear All,

I have installed zimbra in testing environment to collaborate with MS Exchange server 2003 and i follow instruction : Split domain with Exchange as Primary SAMPLE - Zimbra :: Wiki

The installation was successfull, incoming and outgoing mail traffic run so fast .

My question is how i configure zimbra as my second mail system to trigger NDR message to sender if recipient e-mail is not exist (it happens every time sender miswriting recipient e-mail)? or is it possible zimbra drop/delete the message whose wrong recipient e-mail.

Thanks for the response.