relay problem

[unixkid]

Have an issue with relay to internal and external addresses. When I use relay "DSsmtp1.efbailey.com" the internal addresses get routed i.e. joe@efbailey.com but external messages do get routed i.e. bob@yahoo.com

When I change the relay to "DSpublic.efbailey.com" the outside messages get routed but the internal messages die. The internal addresses are be seen as local users on the UNIX server using the /etc/aliases file to turn "joe" into joe@efbailey.com.

Any help would be great... seems like I can't make it work both ways!

##################
# local info #
##################
Cwlocalhost

# my official domain name
CP.

#"Smart" relay host (may be null)
##DSpublic.efbailey.com
DSpublic.efbailey.com