Creating a computer object for the SMTP Server
A computer object for the SMTP server is used when you create the access rule, enabling you to limit outbound SMTP access to the created computer object. If you have more than one SMTP server that needs to send SMTP messages to the Internet, create a computer set for all of your SMTP computer objects, instead of a single computer object.
Use the following procedure to create a computer object.To create a computer object
In the console tree of Forefront TMG Management, click Firewall Policy:
On the Toolbox tab, click Network Objects, click New, and then select Computer.
Type a name for the computer object, such as SMTP Server, in the Name field, and then type the computer's IP address in the Computer IP Address field. If you do not know the IP address, you can use the Browse button.