The SMTP service is not installed by default with IIS. You must install the SMTP service using Control Panel. Installing the SMTP service creates a default SMTP configuration that you can then customize by using IIS Manager.
To install the SMTP service on IIS 6.0
On the Start menu, click Control Panel, double-click Add or Remove Programs, and then click Add/Remove Windows Components.
In the Components list, click Application Server, and then click Details.
In the Subcomponents of Application Server list, click Internet Information Services (IIS), and then click Details.
In the Subcomponents of Internet Information Services (IIS) list, select the SMTP Service check box, and then click OK.
Click Next. If you are prompted for the Windows CD or the network install path, follow the instructions.
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