Quote Originally Posted by Radhakishan View Post
Thanks Mr Phoenix for valuable replys, My problem is solved now, its running fine.
I'm glad you've fixed it.

Quote Originally Posted by Radhakishan View Post
I have not changed hosts file and even not installed DNS.
Your hosts file does need to be changed otheriwse it will cause you problems. As you're behind a NAT router then you will need valid DNS A & MX records, if you don't have them set-up on a LAN DNS server you will need them.