The Agents tab dialog configures the agents that are scheduled to run against each post office.
Quota Notifications
Quota notifications can be disabled for each post office within this properties tab. This can be disabled for all mailboxes or, a warning message can be sent whenever a mailbox is within a set percentage of available space.Any existing quota notification in a users inbox will be overwritten with the latest email. This causes the notification email to appear as a new message and stops unused mailboxes from filling up with the notifications.
Mailbox cleanup agent
Allows the automatic deletion of folders from Postmaster account inbox and all post office inboxes, deleted items, sent items to all Junk-Email items folders. It can be set not to delete any unread messages and delete messages in folder over a specified amount of days old.