In Exchange 2000 and Exchange 2003, the Simple Mail Transfer Protocol (SMTP) connector replaces the Internet Mail Service in earlier versions of Exchange for mixed mode environments. However, it should be noted that in pure Exchange 200x environments, a connector is not a requirement for Internet mail flow.
Everything is SMTP-based. The default SMTP virtual server, by itself, can handle all Internet traffic (inbound and outbound). Typically, the main reason for an SMTP connector is to relay some or all mail via specified hosts.
Displaying Routing Groups and Administrative Groups
After you install Exchange Server in an Exchange 2003 organization or in an Exchange 2000 organization, Exchange System Manager does not automatically display routing groups and administrative groups. You must configure the Exchange organization to display routing groups and administrative groups.
To Configure System Manager to Display Routing and Administrative Groups(per http://support.microsoft.com/kb/312411):
- Start the System Manager from the Microsoft Exchange program group.
- Right click the top-level node and on the shortcut menu, click Properties.
- In the Properties dialog box, select the Display routing groups and Display administrative groups check boxes, and then click OK.
- In the message box that informs you that you need to restart the System Manager, click OK, and then restart System Manager.
- There should be a container called Administrative Groups in the console tree. Expand the nodes.
- Click the Members container within the First Routing Group object. Your server is the Master server in the First Routing Group.