MailBoss Mail Manager High Security Mail Box — Black The Mail Manager by Mail Boss is the new locking security mailbox for those looking for security without breaking the bank. The Mail Manager is made of 14- and 16-gauge galvanized steel, and features the same patented anti-pry latch locking mechanism as its larger counterparts, just in a smaller size. Baffle door design allows for delivery of small packages without compromising mail security.