--- product_id: 134388333 title: "Mail Boss In-Ground Heavy Duty Steel Mailbox Post for Mail Boss Mailboxes | Rot-proof alternative to wood posts, powder-coated steel, pairs with all Mail Boss curbside mailboxes, in-ground install." brand: "mail boss" price: "$379.47" currency: USD in_stock: true reviews_count: 13 url: https://www.desertcart.us/products/134388333-mail-boss-in-ground-heavy-duty-steel-mailbox-post-mail store_origin: US region: United States of America --- # Includes 4 mounting bolts & instructions Powder-coated weatherproof finish Heavy-duty 10- & 14-gauge steel Mail Boss In-Ground Heavy Duty Steel Mailbox Post for Mail Boss Mailboxes | Rot-proof alternative to wood posts, powder-coated steel, pairs with all Mail Boss curbside mailboxes, in-ground install. **Brand:** mail boss **Price:** $379.47 **Availability:** ✅ In Stock ## Summary > 🛠️ Elevate your curb appeal with the post that outlasts the rest! ## Quick Answers - **What is this?** Mail Boss In-Ground Heavy Duty Steel Mailbox Post for Mail Boss Mailboxes | Rot-proof alternative to wood posts, powder-coated steel, pairs with all Mail Boss curbside mailboxes, in-ground install. by mail boss - **How much does it cost?** $379.47 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/134388333-mail-boss-in-ground-heavy-duty-steel-mailbox-post-mail) ## Best For - mail boss enthusiasts ## Why This Product - Trusted mail boss brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Weatherproof Warrior:** Durable powder-coated finish stands strong against rain, snow, and sun for year-round reliability. - • **Seamless Compatibility:** Designed to perfectly pair with all Mail Boss curbside mailboxes for a sleek, secure setup. - • **Easy, Secure Installation:** Includes 4 mounting bolts and clear instructions—get your mailbox post installed hassle-free. - • **Reinforced Stability Option:** Fits over a 4x4 wood post for deep in-ground installations with rebar reinforcement—ultimate durability. - • **Built to Last, Built to Impress:** Heavy-gauge electrogalvanized steel resists rot and warping—no more replacing wood posts every season. ## Overview The Mail Boss In-Ground Heavy Duty Steel Mailbox Post is a 44.5-inch, powder-coated, electrogalvanized steel post designed for long-lasting, rot-proof mailbox mounting. Compatible with all Mail Boss mailboxes, it includes mounting hardware and supports reinforced installation, ensuring a weather-resistant, secure, and maintenance-free solution for your curbside mailbox. ## Description The In-Ground Steel Mounting Post is made of heavy-duty 10- and 14-gauge galvanized steel with a durable powder-coated finish. Use this 43" in-ground post to mount any Mail Boss locking mailbox. The post will fit over a 4"x4" wood post for deep installations and reinforcement with rebar. ## Features - 44.5 inch post made of heavy-duty 10- and 14-gauge electrogalvanized steel - Durable powder-coated finish over electrogalvanized steel stands up to weather season after season, with none of the rot or warping of a wood post - Can be used with a wooden post for deep in-ground installations - Includes 4 mounting bolts and clear instructions - Mail Boss mailbox not included ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B07QN8J1RC | | Best Sellers Rank | #12,160 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #1 in Mailbox Posts | | Color | Wood Grain | | Customer Reviews | 4.7 4.7 out of 5 stars (4,344) 4.7 out of 5 stars | | Date First Available | April 12, 2019 | | Finish | Steel | | Included Components | Installation Hardware & Instructions, Mailbox Post | | Item Model Number | 7124 | | Item Package Quantity | 1 | | Item Weight | 14 pounds | | Manufacturer | Epoch Design LLC | | Material | Heavy-Gauge Galvanized Powder-Coated Steel | | Part Number | 7124 | | Pattern | Post | | Product Dimensions | 4 x 4 x 43 inches | | Shape | as shown | | Style | In-Ground | | Warranty Description | Limited Lifetime | ## Images ![Mail Boss In-Ground Heavy Duty Steel Mailbox Post for Mail Boss Mailboxes | Rot-proof alternative to wood posts, powder-coated steel, pairs with all Mail Boss curbside mailboxes, in-ground install. - Image 1](https://m.media-amazon.com/images/I/713fTpLVPDL.jpg) ![Mail Boss In-Ground Heavy Duty Steel Mailbox Post for Mail Boss Mailboxes | Rot-proof alternative to wood posts, powder-coated steel, pairs with all Mail Boss curbside mailboxes, in-ground install. - Image 2](https://m.media-amazon.com/images/I/816x7EZh9tL.jpg) ![Mail Boss In-Ground Heavy Duty Steel Mailbox Post for Mail Boss Mailboxes | Rot-proof alternative to wood posts, powder-coated steel, pairs with all Mail Boss curbside mailboxes, in-ground install. - Image 3](https://m.media-amazon.com/images/I/81Fqa6nGaUL.jpg) ![Mail Boss In-Ground Heavy Duty Steel Mailbox Post for Mail Boss Mailboxes | Rot-proof alternative to wood posts, powder-coated steel, pairs with all Mail Boss curbside mailboxes, in-ground install. - Image 4](https://m.media-amazon.com/images/I/81ACQMAfK9L.jpg) ![Mail Boss In-Ground Heavy Duty Steel Mailbox Post for Mail Boss Mailboxes | Rot-proof alternative to wood posts, powder-coated steel, pairs with all Mail Boss curbside mailboxes, in-ground install. - Image 5](https://m.media-amazon.com/images/I/61YfmQQ7wKL.jpg) ## Available Options This product comes in different **Color Name** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Nice steele *by on Reviewed in the United States July 7, 2026* Very good and sturdy. Was easy to install and the appearance is nice. Very well secured and the sizing is great. ### ⭐⭐⭐⭐⭐ Good buy *by on Reviewed in the United States June 3, 2026* Excellent. Easy to put in the ground. Worked with my Mail Boss ### ⭐⭐⭐⭐⭐ Well made post but probably will need a longer wood beam inside it to extend length *by on Reviewed in the United States August 10, 2017* I purchased the 7121 post to support the Mail Boss 7106 mail box. The Mail Boss 7121 in-ground steel post is 4”x4” with a hollow interior that will fit snugly over a standard 3.5”x3.5” wood post (although the wood post will need to be reasonably straight). The steel post weighs 14 pounds. It is completely open at the bottom end and has a square 4 and 3/8 inch wide steel top plate securely welded over the top end of the post. The steel walls of the post are roughly 1/16” thick and quite sturdy. There are four threaded holes in the top plate that are spaced in a square that is 3 and 11/32 inches (center-to-center) apart. The four holes extend through the top plate into the hollow interior of the post (not outside of it). The mounting plate included with the Mail Boss 7106 mail box has a total of 24 3/8” holes arranged symmetrically in it, and four of these holes line up very nicely with the four threaded holes on the top plate of the 7121 steel post. The post includes four lag bolts with which to secure the mounting plate to the steel post. Strangely, though, the heads of these four lag bolts require an 11 mm wrench – a ½ inch wrench will strip the lag bolts’ drive head. It’s very strange they would use 11 mm heads and not ½ inch. One of the four sides of the post has no holes in it, but the other three sides each have two 5/16” holes, one located 1 and 3/8 inch (to the center of the hole) from the bottom of the post and the second located 4 and 3/8 inch from the bottom of the post. These holes can be used to secure the steel post to a 3.5”x3.5” wood post with six No. 10 (or ¼ inch) by 2” lag screws or the like, which are not included and must be purchased separately. I would use nothing but a zinc-coated steel lag screw (19 cents each at any Home Depot) to avoid possible corrosion due to dissimilar metals where the screw head touches the galvanized steel post when it is placed in the ground.Both the 7121 post and the 7106 mail box were completely black. When the post is set into the ground, the mounting plate is bolted onto the top plate of the post. The heads of these bolts will be inaccessible to a thief once the mail box is placed onto the mounting plate and secured to it with the two bolts described above that are accessible only by unlocking the mail door with one of the included keys. After bolting the mounting plate to the post, one slides the mail box onto the mounting plate, and then attaches them with the two screws previously mentioned. No bolt or screw can be accessed by a thief unless they open the lockable door.U.S. mail regulations require that the mail entry slot of the mail box be located between 41 and 45 inches above the road surface. The mail entry slot on this mail box is approximately 12 inches above the top plate of the steel post when the mail box is mounted on the post using the included mounting plate. Since the post is 43” long, this means that you will only be able to sink about 10 to 14 inches of the steel post into the ground if the roadway is level with the ground onto which you will mount the mail box. If you are on a residential street with a curb and you will mount the mail box into ground that is a few inches above the street surface, you may be able to sink the steel post a few inches more. But even this is probably not deep enough to securely hold the heavy mail box, even if you concrete the post all the way up to the surface. It is highly likely that you will want to use a pressure-treated wood post inside the hollow steel post to enable you to sink the post significantly deeper – particularly if you do not use concrete. In cold climates, you probably want to be at least 3 to 4 feet deep in the ground. Note also that the front face of the mail box should be between 6 and 8 inches back from the side of the road surface (close enough for the postman to reach it comfortably but not so close that he hits the mirror of his van on it).I had a handy man install my 7121 steel post (with a longer wood post inside it). He charged $150, but I gave him a little more because it was difficult to break up and remove the concrete footing from the previous mailbox post. He used an 80 pound bag of Quikrete to install my post. Installation of the mailbox on the post once it was installed was easy and quick. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/134388333-mail-boss-in-ground-heavy-duty-steel-mailbox-post-mail](https://www.desertcart.us/products/134388333-mail-boss-in-ground-heavy-duty-steel-mailbox-post-mail) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-14*