Abstract: A security mailbox is provided having a housing with a lower storage compartment having a lockable door for the retraction of mail and an upper door for the introduction of mail. The upper portion of the mailbox is further provided with a sloping slanted top, a tray mounted in the interior for the placement of outgoing mail, a restricted throat with a curved lower portion leading into the storage area for the introduction of mail so that the mail is deposited into the storage department and can only be retrieved through the lower lockable door. A conventional manually rotatable flag is attached on the outside of the mailbox. A method of mounting multiple security mailboxes is also disclosed.