Arvind Hotkar

I am working as a computer inchage in management college.

I was new purchase domain name as hsnc-mgmt.org
my server name is inst.arvindhot.org

I want to configure the exchange server with intenet domain name for emails

i was tried but server provide me a message as
Configure error in the email system caused the message to bounce between two server or to be forwarded between two receipient.

help me