smtp domain question

[Debian Ghost <debian@ghost.ntelos.net>]

Hey Guys,
I have just changed DNS to point to a different domain. 
I changed from ghost.net.cfw.com to ghost.ntelos.net. I edited
the /etc/exim.conf file to reflect the change, but for some reason
when I telnet to smtp "ESMTP", it still thinks it is the old domain rather
than the new. Is there a global configuration I need to make system wide
to get my services to recognize the new domain?

root@ghost:/etc> telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 ghost.net.cfw.com ESMTP Exim 3.12 #1 Wed, 25 Oct 2000 13:30:24 -0500

Any advice appriciated!
Thank you kindly,

D. Ghost