How to Disable a Connector
If necessary, you can disable or remove existing connectors in your organization. You can disable a connector that you do not want Exchange to use by setting the connection schedule to Never. Disabling a connector instead of deleting it helps you to retain the configuration settings if you want to enable it again in the future.
Procedure
To disable a connector
In Exchange System Manager, right-click a connector, and then click Properties.
Select one of the following options:
For an X.400 connector, click the Schedule tab, and then click Never.
For an SMTP connector or a routing group connector, click the Delivery Options tab. Under Specify when messages are sent through this connector, in Connection time, select Never run from the drop-down list.