By default in Microsoft Exchange Server 2000, Out-of-Office replies to the Internet is disabled. Many administrators do not allow Out-of-Office auto-replies to be sent outside of the Exchange organization to prevent unauthorized people from learning when users are out of the office.

To enable Out-of-Office replies to the Internet:

1. Start Exchange System Manager.
2. Double-click Global Settings, and then click Internet Message Formats.
3. In the Details pane, right-click a domain name, and then click Properties. The default SMTP domain is "*".
4. In the Properties box, click the Advanced tab, and then click to select the Out of office responsescheck box. This enables Out-of-Office responses to the Internet for the selected domain.