A security mailbox system known as Safe "T" Box being a fully enclosed square mailbox that can be designed from PVC or some fabricated material, the Safe T Box is easy to install, environmentally friendly and will provide long service life. The mailbox includes chambers for incoming and outgoing mail being delivered via the U.S. Postal Service, it also has a chamber for newspapers/advertisements not delivered via U.S. Postal Service. The incoming mail chamber is designed for mail to go down a mail chute into a basket for pick-up through back of the locked mailbox. Outgoing mail can be placed from the back for pick-up from the front by postal worker. The mailbox is attached to the ground though internal poles extending from the bottom of the mailbox into the ground and cemented.