Keystone Signature Mailbox with Deluxe Post


USPS Approved Keystone Mailboxes
Elegant, distinctive design with a large capacity to hold multiple days of mail along with magazines and small packages.

Original price was: $826.00.Current price is: $628.00.

Item#: KSSDP



SAVE $198 (Reg. $826)


Volume Discounts
Quantity Savings
2-4 Units Additional 5% OFF
5-9 Units Additional 8% OFF
10+ Units Additional 10% OFF

Contact Us for Bulk Pricing
Optional Accessories

In Stock
Ships in 1-3 days

Found a lower price? We will beat it!




Package Includes Keystone Signature Mailbox and Deluxe Post


Keystone mailboxes are built with the finest materials and feature a blend of traditional style with contemporary elegance. Each Keystone mailbox is made of heavy-duty aircraft-grade aluminum and features all stainless- steel hardware.

• Large Size (12 1/4” H x 10 3/8” W x 20 1/8” D) holds multiple days of mail, magazines, catalogs and packages. Magazines and document mailings lay flat, preventing tears and creases.
• Crafted of aircraft-grade aluminum, all stainless-steel hardware and a rich, powder-coat paint finish.
• Solid brass faceplate and outgoing mail flag.
• Optional locking insert available to prevent mail theft.
• 13 different design and color combinations available to compliment your home’s unique style.
• Includes all installation hardware and easy-to-use instructions.




13 Different Color and Accent Combinations


Deluxe Post


The Keystone Series Standard Post is the ultimate addition to your Keystone mailbox and creates a beautiful, functional and seamless presentation. The Deluxe Post features a curved brace, ball finial, decorative post cuff, and versatile mounting arm that allows for right, left, or front mailbox mounting. The Deluxe Post can also accommodate the Personalized Deluxe Address Plaque (sold separately) and the Newspaper Holder (sold separately).

Heavy Duty Aluminum Construction

Available in Black, White, Bronze, and Almond

Dimensions 77 1/2” H x 22 3/4” W x 8” D

Weight 22lbs


Standard & Decorative Post Address Plaques


Display your house number prominently with a Keystone Post Address Plaque. Each plaque is made of rust-proof, die-cast aluminum and can be added to any new or existing Keystone Series Mailbox and Post. Standard Post Address Plaques attach simply and securely under the mailbox using the new address plaque mounting bracket (included) and Deluxe Post Address Plaques attach to the curved brace.

Each plaque kit includes mounting bracket, plaque and mounting bolts.

Up to 6 characters in Bronze, Gold, or Silver lettering.

Available in White, Black, Bronze, and Almond.





Newspaper Holder


Heavy-Duty all Aluminum Newspaper Holder attaches easily to the Keystone Deluxe Post or Multi-Unit Post (not compatible with Standard Post). Available in 4 powder-coated finishes. Installation hardware included.



Keystone Locking Insert


Prevent mail theft by converting any Keystone Series Mailbox to a locking mailbox in seconds. Rust-resistant aluminum construction with a stainless steel lock. Includes two keys and easy to follow instructions.



Decorative Post Cuff


The Keystone Series Decorative Post Cuff offers a stylish addition to your mailbox post. Crafted of rust-proof, powder-coated aluminum, the cuff fits all Keystone series posts and easily installs in seconds.

Available in Black, White, Bronze, and Almond.


Mailbox Lettering


Personalize your Keystone Mailbox with vinyl lettering available in bronze, gold, and silver. Lettering is available on either or both sides of your Keystone Mailbox.

Up to 20 characters per side

Marine-grade ultraviolent-resistant vinyl lettering


About Gaines Manufacturing


In 1991, Gaines Manufacturing recognized the need for a line of beautifully designed and expertly manufactured mailboxes. From their inception, Gaines Manufacturing has been committed to making the highest quality mailboxes, posts, and accessories. All Gaines products are meticulously hand-crafted and assembled, combining beauty, elegance, functionality and durability. Gaines is proud to manufacture their mailboxes and accessories in the USA.

Why Shop Mailbox Emporium?


    • 5 Star Customer Service – At Mailbox Emporium, we strive to provide you with the best possible mailbox purchasing experience every time you shop with us. Check out our 5 star reviews and see why over 30,000 customers choose us for their mailbox needs. Have mailbox questions? No worries, we have the answers! Chat online or call one of our mailbox experts today.


    • Low Price Guarantee – Shop with confidence! We regularly check our competitors’ pricing to make sure we have the lowest prices online in the US. If you ever find a lower price from an authorized mailbox dealer, send it our way and we’ll beat it. Guaranteed!


    • Free & Fast Shipping – Yup, we offer that too. Free shipping is available on all products we sell in the continental United States. Many items are available to ship out in 2-3 business days.


    • Highest Quality Mailboxes – For commercial and community mailboxes, we sell only authorized Florence and Salsbury products. These two companies manufacture the highest quality mailboxes in the US and most products include a 5-year, worry free warranty. We are proud to sell American Made Mailboxes!


Call a Mailbox Specialist Today – 1-888-352-9194

Ted Baxter FL, United States
Great experience. Mailboxes arrived on time and in perfect condition.

Tim was very helpful and we are very happy with our new mailboxes 🙂