Routing describes how Microsoft Exchange 2000 Server transfers messages from one user to another. This includes messages to servers within an Exchange organization and servers outside Exchange messaging systems. Within some groups of computers, servers are connected by reliable, permanent connections. These computers should be put in the same routing group. Between routing groups, there may be unreliable or slower connections.
Simple Mail Transfer Protocol (SMTP) and X.400 connectors can be used to connect to foreign messaging systems and Exchange routing groups. Routing Group connectors can only be used to connect to Exchange routing groups.
This section provides the following general information about message routing: