Who is the administrator?

Hello,

My mail server is running Exchange 5.5. I have not created an email address for the ADMINISTRATOR account.

Assume that a user sends a message to a wrong email address. This message becomes undeliverable and returns back to sender.

Can I make a modification to exchange settings in order to receive an email message that will notify me everytime a user
got an undeliverable message back?

My user account is a member of the administrators group but I do not receive such kind of undeliverable notices.

Thanks in advance!