The Capitol Mailbox; fashion and function with a classic design. A simple way to enhance the curb appeal of your home. Makes a great first impression, enhancing the curb appeal and value of your home. The Capitol Mailbox is 20% larger than a standard mailbox. Magazines lay flat in the generous interior. Approved by Postmaster General. Manufactured from sand cast, high-density aluminum alloy with a Alumi-Shield All Weather Coating: A Whitehall Exclusive. Alumi-Shield – Protects against the harshest weather and environmental elements. Extends the product life and maintains the look and function.