What is a smart host?

Applies To: Windows SBS 2008

A “smart host” (also known as a relay host) is a dedicated server through which Exchange Server routes all outgoing messages. The smart host then forwards the message to the remote domain. When you designate a smart host, your Exchange Server needs to transmit only to the smart host instead of repeatedly contacting the remote domain until a connection is made. This improves the performance of your server and the reliability of your e-mail delivery.

Contact your Internet Service Provider (ISP) for smart host configuration information.

Advanced options

In some cases, it may be necessary to change the port number that SMTP uses to send e-mail. For information about how to do this, see the Exchange Server TechCenter at the Microsoft Web site (https://go.microsoft.com/fwlink/?LinkId=117343).

If you want to remove or change a smart host that you previously specified, in the Configure Internet Mail Wizard, remove or change the entry in the Smart Host Server text box, and then click Next to finalize your changes.