oo IS AIL MANAGERIAL Congratulations on the purchase of your Mail BossĀ® Mail ManagerĀ® locking security mailbox. The Mail Boss Mail Manager is designed with your security and convenience in mind. This mailbox is constructed of tough, vandal resistant, heavy gauge galvanized steel and comes with patented security features to keep your mail safe. The Mail Manager mailbox is designed with a large internal volume so that more than several days of mail can be securely stored inside.