Disable Delivery Status Notification (Failure) on IIS or SMTP server

Hi,

I am using IIS8 and IIS6 for SMTP,

I have a few clients , who i sent emails on a regular basis for the users of my client website.

My clients always complain that their mailbox is full of Delivery Status Notification (Failure) emails, How can i stop IIS from sending the notifications , I can't change the from address to use a fake address because the emails from address has to be my clients email address. Is there a way i can stop or divert failed email alert to another email.

Please advice.

Thank you.