Send Connector Properties > Network Tab (RTM)

Microsoft Exchange Server 2007 will reach end of support on April 11, 2017. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.


Applies to: Exchange Server 2007

Use the Network tab on the Send connector properties to configure a connector. You can use the Domain Name System (DNS) to determine how to route all outbound mail through the connector. Alternatively, you can specify a smart host to which the connector routes all mail.

If you route mail to the Internet through an Internet service provider (ISP), contact your ISP to determine what IP address or fully qualified domain name (FQDN) to use for the smart host.

  • Use domain name system (DNS) "MX" records to route mail automatically
    To use DNS to route outbound mail, select this option. The connector uses DNS to resolve the IP address of the remote Simple Mail Transfer (SMTP) server. Then it delivers the mail.

    If you select this routing method, verify the following:

    • Can your DNS server successfully resolve names on the Internet?

    • If you have used the Set-TransportServer cmdlet to configure an external DNS server that differs from the one specified on the network connection, can this external DNS server resolve names on the Internet?


      If you use the defined external DNS server to resolve addresses, make sure that the connector has been configured to use the external DNS settings.
      For more information, see Set-SendConnector (RTM).

  • Enable Domain Security (Mutual Auth TLS)
    To configure this Send connector to attempt to establish a mutual TLS connection with a remote server, select this check box. In addition to selecting this check box, you must also perform the following to enable mutual TLS:

    • Generate a certificate request for TLS certificates

    • Import a certificate to Edge Transport servers

    • Configure inbound domain security

    • Configure outbound domain security

    • Test mail flow

    For more information about how to configure mutual TLS, see How to Configure Mutual TLS for Domain Security.

  • Route all mail through the following smart hosts
    To use a smart host to handle DNS resolution and deliver the mail, select this option.

    To edit an existing smart host, select the smart host, and then click Edit.

    To remove an existing smart host, select the smart host and then click Remove icon.

    To add a new smart host click Add. You can specify either of the following options in the window that appears:

    • IP Address   To identify the smart host by IP address, select IP Address. Then type the IP address in the text box as in the following example:

    • Fully qualified domain name (FQDN)   To identify the smart host by FQDN, select Fully qualified domain name (FQDN). Then type the FQDN in the text box. FQDN is a DNS name that has been stated to indicate its absolute location in the domain namespace tree. For example, type


    You can set up a server that is running Exchange Server as the smart host. However, make sure that the smart host Exchange server is not one of the Exchange servers to which this Send connector is sourced in the Source Servers tab.

  • Use the External DNS Lookup settings on the transport server
    Select this option to use the external DNS servers list to resolve names on the Internet.


    Verify that you have configured the external DNS servers list by using the Set-TransportServer cmdlet or by using the External DNS Lookups tab in the properties of the Hub Transport server object, or the Edge Transport server object.

For More Information

For more information about Send connectors, see the following topics: