Site Hierarchy site
In the details pane, right-click the Standard Sender address
whose schedule you want to set, and then click
In the Standard Sender Address Properties dialog box,
click the Schedule tab.
Select a time period by dragging. The selected time period
appears in the box below Scheduled availability for selected
time period. (For example, Monday through Friday, 8 A.M. to 5
Specify the priorities of the data that can be sent to this
address during the specified time period. To do so, select an
option in the Availability list.
SMS can use this address as a substitute if another address to
this site fails. To prevent this address from being used as a
substitute during the selected time period, select Unavailable
to substitute for inoperative addresses.
To specify other time periods, repeat steps 4 through 6.