Topic Last Modified: 2007-05-16

If you don't use Transport Layer Security (TLS) encryption for the Simple Mail Transfer Protocol (SMTP) virtual server, but you select the TLS encryption check box for this remote domain, Windows Server 2008 SMTP Server will use TLS encryption when it connects to the remote domain. Domain configurations always override the virtual server configurations.


To enable TLS encryption for a remote domain

  1. Expand the SMTP virtual server, and then click Domains.

  2. In the results pane, click the remote domain you want to change. On the Action menu, click Properties.

  3. On the General tab, click Outbound Security to open the Outbound Security dialog box.

  4. Select Integrated Windows Authentication.

  5. Type the Windows account and password.

  6. Click OK.

  7. Select the TLS encryption check box, and then click OK.

If the remote domain does not support TLS encryption, all messages will be returned with a non-delivery report (NDR).