How to catch bounced messages
Hi,We are creating a free web based mail system. We are using a dedicated server for the same.
Currently i am finding that when a message is sent to a unknown email address which does not exists like say abcd@987yhjsyshs.com
The mail does not bounce back. How do i make sure that the mail bounces back

Do we need to configure something on the server.
Please help.
Abhishek
PS: The site we are talking about is http://www.prayforpeace.com/index.php which we are launching tonight on behalf of our customer.