Follow this procedure to delete notification subscriptions.
To delete notification subscriptions:
In Dimensions Build select the Notifications tab.
In the navigation pane select Notifications, select Subscriptions, and select the Dimensions project containing the build configuration where you want to delete notification subscriptions.
In the navigation pane select the build configuration and select Events.
In the content pane select the check box next to each notification event that you want to delete.
Click Delete. To confirm that you want to delete the notification events click Yes.