Topic Last Modified: 2006-08-09

The Microsoft® Exchange Server Analyzer Tool queries the Active Directory® directory service for the distingushedName attribute value of the protocolCfgSMTPServer object class to list all Simple Mail Transfer Protocol (SMTP) virtual server instances on the user-specified Exchange gateway.

The Exchange Server Analyzer then queries Active Directory for the value of the msExchSourceBridgeheadServersDN and routingList attributes for each msExchRoutingSMTPConnector object found to determine whether an SMTP connector correctly has one of the detected SMTP virtual server instances set as its local bridgehead to an external SMTP address space.

Finally, the Exchange Server Analyzer queries Active Directory for the value of the msExchSmtpSmartHost attribute on all the detected SMTP connectors (msExchRoutingSMTPConnector object) to determine whether one of them has been designated as a smart host for the user-specified non-Exchange gateway server.

If the Exchange Server Analyzer determines that the user-specified non-Exchange gateway server is not set up as a smart host for one of the SMTP connectors, the Exchange Server Analyzer displays a warning.

This warning indicates that there is no explicit route set up from the user-specified Exchange gateway server to the user-specified non-Exchange gateway server and that servers other than the non-Exchange gateway may unintentionally route messages outside the organization.

To address this issue, designate the non-Exchange gateway server as a smart host for an SMTP connector.

To view and configure smart host settings
  1. Open Exchange System Manager.

  2. Expand Servers, expand an Exchange server, expand Protocols, and then expand SMTP.

  3. Right-click an SMTP virtual server, for example, Default SMTP Virtual Server, and select Properties.

  4. Select the Delivery tab, and then click Advanced.

  5. Enter the smart host you want to use. You can identify the smart host by the fully qualified domain name or by an IP address. If you use an IP address, you must enclose it in brackets ([ ]). Exchange checks first for a server name, and then for an IP address. The brackets identify the value as an IP address. Therefore, the DNS lookup is bypassed.

  6. If this is a server that is running Exchange 2000 Server, optionally select the Attempt direct delivery before sending to smart host check box.

  7. Click OK to save the changes, and then click OK to close the Properties dialog box of the SMTP virtual server.

For more information about how to configure a smart host connector, see Microsoft Knowledge Base article 821911, "How to Configure Exchange Server 2003 to Use a Smart Host IP Address" (

For more information about how to use SMTP connectors, see Microsoft Knowledge Base article 294736, "When to create SMTP connectors in Exchange 2000 and later versions" (

For more information about SMTP connectors, see the Exchange Server 2003 Transport and Routing Guide (