Web Server IIS SMTP services to enable in windows server 2008. so, Launch the Windows 2008 Server Manager.
1- Left side selects Features and then under the Feature Summary click Add Features.
2- From the Add Features Wizard so, select the SMTP Server.
3- The SMTP Server feature required additional role services and features. So, click Add Required Role Services.
4- After adding the required role services, click next.
5- Web server iis features click next.
6- In this screens select any required role services and features and click next.
7- Confirm installation selections and click Install to start the installation.
8- SMTP Server installed successfully, click close.
For more details click here
Backup and Restore Configurations in IIS 6.
