If Exchange Server is configured for SMTP mail, you must configure the Configure Internet Domain Name page. The domain name entered must be one provided by your ISP or one you have registered with the Domain Name Registry. This domain name will be configured as the reply address for all the recipients created in the Exchange Server Administrator.
The domain name appears under the Site Addressing properties for the site in Exchange Server. If your connection to the Internet is a dial-up connection to the ISP, this is the domain name that will be configured for mail retrieval. The domain name is configured automatically in the Dialup Connections tab under the properties for the Microsoft Exchange Server Internet Mail Service in the Connections container for the site.
Checking the I want to use the Web Publishing Wizard box displays a page for configuring your Web site information.