Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2007-08-13

After you install the Hub Transport server role on a Microsoft Exchange Server 2007 computer, you must manually create Send connectors and Receive connectors to establish mail flow between your organization and the Internet. By default, no Send connectors are created on Hub Transport server. Also, the default Receive connector named "Default Server Name" that is created on all Hub Transport servers to listen for incoming connections on port 25 doesn't accept anonymous connections.

Before you configure new connectors, you should understand that internal mail flow between Hub Transport servers in the Exchange 2007 organization is automatically handled by the following connectors:

• The intra-organization Send connector   The intra-organization Send connector is invisible and computed based on the Active Directory directory service site topology. For more information about internal message routing, see Understanding Active Directory Site-Based Routing.
  
  
• The default Receive connector   This Receive connector, which is named "Default Server Name", listens for incoming authenticated connections on port 25 from other Hub Transport servers in the Exchange organization. For more information, see Configuring Hub Transport Server Connectors.
  
  

The Send connectors and Receive connectors that are required to establish Internet mail flow depend on how your Exchange organization connects to the Internet. The following list describes possible scenarios and provides links to supporting documentation:

• You send and receive Internet e-mail by relaying through a subscribed Edge Transport server. A subscribed Edge Transport server has been subscribed to the Exchange organization. The Microsoft Exchange EdgeSync service that is running on the Hub Transport servers periodically synchronizes recipient and configuration data to the Active Directory Application Mode (ADAM) directory service instance on the Edge Transport server. For more information, see How to Configure Internet Mail Flow Through a Subscribed Edge Transport Server.
  
  
• You send and receive Internet e-mail by relaying through an Edge Transport server that is not subscribed to your Exchange organization. You must manually create the required Send connectors and Receive connectors that establish mail flow between a Hub Transport server and the Edge Transport server. For more information, see How to Configure Mail Flow Between an Edge Transport Server and Hub Transport Servers Without Using EdgeSync.
  
  
• You send and receive Internet e-mail by relaying through Microsoft Exchange Hosted Services or other external Simple Mail Transfer Protocol (SMTP) gateway servers. For more information, see How to Configure Internet Mail Flow Through Exchange Hosted Services or an External SMTP Gateway.
  
  
• You send and receive Internet e-mail directly through the Hub Transport server. For more information, see How to Configure Internet Mail Flow Directly Through a Hub Transport Server.
  
  

For More Information

To ensure that you are reading the most up-to-date information and to find additional Exchange Server 2007 documentation, visit the Exchange Server TechCenter.

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