gwia as relay for Domain ??

At this time:
GroupWise | "Internet Addressing.." |"Internet Domains" = "firma.ua"
and "firma.ua" - Preferred Domain.
gwia have ip = 192.168.252.13.

When i do from the 192.168.252.10:
telnet 192.168.252.13 25
helo localhost
mail from:user1@firma.ua
rcpt to:user2@firma.ua
data
test
.
quit

Then GroupWise user "user2" receieved this test mail.
This is Ok.

What i need:
Reconfigure GWIA for this:
All mails for @firma.ua delivery to the external server 192.168.252.110 .
Not to the GroupWise !!!

How i can do this ?

Serg