If you select...
Then the content pane displays...
Base Database 
or
Object Class 
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List of mail events and associated descriptions, creation details, and update details.
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: Click to print the list of mail events. -
: Click to save the list of mail events as comma-separated values.
A specific mail event 
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General tab that displays the mail event's name, description, creation details, update details, event type, templates used for the email notification, object class, object type, and event context.
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Group Subscribers and User Subscribers tabs that display the groups and users subscribed to the mail event and subscription details. For promotion and demotion subscriptions, user/group subscriptions for specific stages are displayed. For Deploy and Rollback subscriptions, areas are also displayed.
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: Click to add to the list of users or groups that are subscribed to the mail event. -
: Click to delete an entry from the list of users or groups that are subscribed to the mail event.