Answer Posted / rajmohan

To set up a smart host, follow these steps:
In the MMC, click to select the SMTP virtual server, and
then click Properties on the Action menu.
On the Delivery tab, click Advanced to open the Advanced
Delivery dialog box.
In Smart host, type the name of the smart host server. You
can type a string to represent a name, or you can type an
IP address.
If you want the Microsoft SMTP Service to try to deliver
remote messages directly before it forwards them to the
smart host server, click to select the Attempt direct
delivery before sending to smart host check box. The
default is to send all remote messages to the smart host,
not to try direct delivery.

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