Configure the IIS Mail Service
If you select Microsoft IIS SMTP Service as your mail server, you must configure the Microsoft IIS SMTP service as follows:
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Open the Internet Information Services (IIS) Manager window.
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In the Tree pane, right-click Default SMTP Virtual Server and select Properties. The Default SMTP Virtual Server Properties dialog box opens.
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In the Access tab, click the Connection button. The Connection dialog box opens. Select All except the list below and click OK.
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Click the Relay button. The Relay Restrictions dialog box opens. Select All except the list below and click OK.
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Click OK to close the Default SMTP Virtual Server Properties dialog box.

