Our Exchange 2000 Server's Default SMTP Vitual Server has long queue but we didnt send emails to those domains - after checking & confirming we found that these are automatically generated messages going to those invalid domains from our Postmaster@ourcompany.com saying that - This message is a delivery status notification that cannot be delivered. They cant pass through our exchange server queue because domains are not valid (may be). How can I stop this because if we send test messages to HOTMAIL or on YAHOO it takes half an hour to get there. I want to stop automatically generated messages not to go on internet from our domain. Please provide solution I will be very grateful.