Messaging Gateway

hi i need help regarding the configuration of outbound filtering currently configuration is inbound filtering only...

I think you need to be more specific.  SBG does do both in and outbound filtering.  Are you asking after Content filtering, or what?  An example of what you've tried and what you want to accomplish would help.

We upgraded the SBG 8.0 to 9.0 currently the appliance configuration is inbound mail filtering only so we are planning to enable the outbound mail filtering. How this will affect the current configuration? all i just need is the configuration for outbound mail filtering how to configured/enable this outbound.

I recommend you use seperate interfaces for inbound vs outbound flows (though this is not required).  If your scanner is in a DMZ, I woudl have the inbound (public) interface in the DMZ, and the outbound (private) interface on the inside.   In the Scanner STMP config, make sure you restrict who can connect to the private interface to your mail servers.