USPS Approved full-service residential mailbox With the prevalence of mail theft, a locking mailbox is a modern day necessity. But not all locking mailboxes are secure. In fact, most can be fished by hand or pried open with a screwdriver in seconds. Not the Mail Manager. Mail Manager will protect against mail thieves and mailbox vandals. Its innovative design accepts small packages yet deters fishing, and includes an exclusive patented locking system to prevent prying and leveraged entry.