Exim mail messge error

i have a exim mail server for mms to emails ,the mails are delivering to all the Domains,except the company one.(our own email id's)
When ever we send it to our internal email it says

2008-10-31 14:01:07 1Kvs21-0002zW-00 == samson.isa@gloworld.com T=remote_smtp defer (-44): retry time not reached for any host

we have a seperate DNS server.
from both mail and DNS server i am bale to reslove
mail.glowworld.com and www.gloworld.com
but if i tried to resolve only gloworld.com it is not.
i am not very good in this DNS and Mail configs,could some body plz help ,is we need to do anything at our DNS and mms to email mail server.