How to: Change an Operator's Availability (SQL Server Management Studio)
This topic describes how to change an operator's schedule for receiving alert notifications.
To change an operator's availability
In Object Explorer, connect to an instance of the Microsoft SQL Server Database Engine, and then expand that instance.
Expand SQL Server Agent.
Expand Operators.
Right-click an operator and select Properties, then click the General tab.
Select or clear the Enabled check box.