Gibraltar Mailboxes Reliant Locking Post Mount Mailbox - Large, Black, Galvanized Steel MB981B01

Gibraltar Mailboxes Reliant Large Locking Post Mount Mailbox Overview

The Gibraltar Mailboxes Reliant is a large-capacity, locking post mount mailbox engineered for homeowners who need reliable mail security and attractive curb appeal. Built from heavy-duty galvanized steel, it features a concealed cam lock compartment that prevents unauthorized access to your incoming mail. The mailbox ships fully assembled and is U.S. Postmaster General Approved, making it a code-compliant choice for residential post mounting.

Galvanized Steel Construction and Finish Durability

The Reliant is constructed entirely from impact-resistant, galvanized steel, providing a sturdy foundation that stands up to years of outdoor exposure. A glossy black powder-coated finish adds an extra layer of protection against rust, corrosion, and UV-related fading. At 13.5 lb., the solid build resists denting and distortion even in high-wind or high-traffic environments.

Concealed Cam Lock Security and Delivery Slot

The Reliant's standout security feature is its concealed cam lock compartment, which separates mail delivery from homeowner access. Postal carriers deposit mail through the 10"W x 1.75"H delivery slot, which drops letters directly into the locked lower compartment. Two mailbox keys are included so that multiple household members can retrieve mail without compromising security.

Large 1,450 Cu. In. Capacity and Internal Mail Clip

With a mailbox capacity of 1,450 cu. in. and a 21-inch-deep interior, the Reliant easily holds several days of mail including standard envelopes, 9" x 12" mailers, magazines, and small packages. Steel piano hinges and a sturdy magnetic latch keep the front door closed securely when not in use. For outgoing correspondence, an internal mail clip fastens letters inside the front door so they are visible to your postal carrier; clip attachment hardware may be required.

Installation, Compatibility, and Specifications

The Reliant features pre-drilled bottom mounting holes for straightforward post installation — mounting board and hardware are sold separately. It is compatible with Gibraltar Mailboxes posts designated with the letter C and measures H 11 in. x W 10.8 in. x D 22.3 in. assembled. Access is front-only, assembly is required for post attachment, and the product is backed by a 90-day manufacturer warranty.