Mail Server Behind Isa firewall

I have recently installed ISA server and set up afew
nodes as Secure NAT clients I ran the secure mail
wizard and set up my email server.

I am able to send emails out but am unable to receive
any.

When I try to send mail to the mail server on my
network. I get the following error:   This is an
automatically generated Delivery Status Notification.

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

Delivery to the following recipients has been delayed.

       craig@xxxxxxxxx


Please help me let me know what I am doing wrong.




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