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Mail Boss 7121, Black In-Ground Mounting Post, 43 x 4 x 4 inches, for Use with Mailbox

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4.8 3,705 ratings

Amazon's Choice in Mailbox Posts by Mail Boss

$75.95 with 5 percent savings

List Price: $79.99

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Color Name: Black

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Purchase options and add-ons

Post made of heavy-duty 10- and 14-gauge electrogalvanized steel
Features durable powder-coated finish
Can be used with a wooden post for deep in-ground installations
Includes 4 mounting bolts and clear instructions
Accepts all Mail Boss brand Locking Security Mailboxes

› See more product details

Additional Details

Small Business

This product is from a small business brand. Support small.

Customer ratings by feature

Sturdiness

4.7

Style

4.7

Easy to install

4.5

Easy to lock

4.5

See all reviews

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From the brand

Protect your packages like a Boss! The most elegant & affordable heavy-duty security locking mailboxes on the market today, Mail Boss mailboxes offer an affordable & effective solution to the scourge of mail & identity theft.
- Vandal resistant, commercial-grade galvanized welded steel construction
- Patented anti-fish, anti-pick & anti-drill systems
- Installation-friendly Fast-Trak mounting features
- Designed to last a lifetime
Security that suits your style

Visit the Store
Mail Boss has you covered

Visit the Store
Posts & Accessories

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Secure your home & office

Visit the Store
Mailboxes and MORE!

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Check out our furniture page!

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Product guides and documents

Installation Manual (PDF)

Looking for specific info?

From the manufacturer

Mail Boss steel posts and accessories are available in a variety of powder coated finishes.

Safe. Secure. Reliable.

Mail Boss offers a wide variety of Mailbox accessories.

Protect Your Mail - Protect Your Identity

Mail Boss Locking Security Mailboxes

Family owned and operated since 1997

Epoch Design launched the Mail Boss locking mailbox in 2006, in response to the epidemic of mail-identity theft. The vision of the Mail Boss brand is to offer Americans a secure and affordable solution to stop mail thieves. The original Mail Boss quickly won over consumers and retailers alike with its heavy-duty construction, and innovative security features and has since grown to include dozens of products with significant structural and durability improvements in a range of styles and colors.

Superior quality components:
Galvanized Welded Steel
Weather Resistant Powder Coating


	Drop Box Wall Mount	Metro Wall Mount	Townhouse Wall Mount	Mail Manager Curbside	Mail Boss Curbside	Package Master Curbside

Customer Reviews	1,746	575	1,069	8,341	1,737	678
Price	$71.11	$109.00	$96.41	$105.08	$160.88	$237.99
Vandal Resistant Construction	11 lbs of 1.2mm galvanized welded steel.	18 lbs of 2.0mm & 1.5mm 14 & 16 gauge galvanized welded steel.	20 lbs of 2.0mm & 1.5mm 14 & 16 gauge galvanized welded steel.	23 lbs of 2.0mm & 1.5mm 14 & 16 gauge galvanized welded steel.	40 lbs of 2.5mm & 2.0mm 12 & 14 gauge galvanized welded steel.	53 lbs of 2.5mm & 2.0mm 12 & 14 gauge galvanized welded steel.
Uses	Ideal for residential deliveries, schools, office, home, mail centers, restaurants, key drops, etc. Designed to secure interoffice mail, money, checks, keys, ballots and more!	Optimal for walk up residential deliveries, small mail bundles, magazines and checks.	A decorative alternative to the metro, optimal for walk up residential deliveries, small mail bundles, magazines and checks.	Secure and affordable curbside box accepts packages up to 3.5"h x 10.2"w and can accept mail bundles, books, prescription medications, magazines and checks. Innovative baffle door deters both hand & tool fishing.	The original and popular residential curbside locking mailbox, accepts packages up to 1.9"h x 10.25"w and accepts mail bundles, books, prescription medications, magazines and checks. Incoming mail slot deters fishing by hand.	Our largest residential mail box, ideal for commercial use, and bulk mail deliveries. Accepts legal size envelopes and packages up to 4.5"h x 4.5"w x 10.5”l. Mail shield prevents both hand & tool fishing while allowing for large deliveries.
Mail Storage Capacity	2-3 days.	2-3 days.	2-3 days.	3-7 days.	1-2 weeks.	7-10 days.
Installation	Wall Anchors.	Fast-Trak bracket mounting system for easy mounting to walls, also compatible with post mounts.	Fast-Trak bracket mounting system for easy mounting to walls, also compatible with post mounts.	Universal hole pattern for multipe mounting applications.	Fast-Trak mounting plate installs easily on posts, planks, or platforms in minutes.	Fast-Trak mounting plate installs easily on posts, planks, or platforms in minutes.
Features	Heavy duty galvanized steel with stainless steel hinges, high security anti-pick lock, 3 laser cut keys, installation hardware.	Heavy duty galvanized steel with stainless steel hinges, high security anti-pick lock, 3 laser cut keys, installation hardware, reflective house numbers.	Heavy duty galvanized steel with stainless steel hinges, high security anti-pick lock, 3 laser cut keys, installation hardware,reflective house numbers.	Heavy duty galvanized steel with stainless steel hinges, high security anti-pick lock, 3 laser cut keys, installation hardware, plastic floor liner.	Heavy duty galvanized steel with stainless steel hinges, high security anti-pick lock, 3 laser cut keys, installation hardware, reflective house numbers.	Heavy duty galvanized steel with stainless steel hinges, high security anti-pick lock, 3 laser cut keys, installation hardware, reflective house numbers, plastic floor liner.
Mounting Applications	Capable of being mounted flush side by side and top to bottom for customizable residential apartment cluster mailboxes and commercial office document drops.	Capable of being mounted flush side by side and with only a small gap top to bottom, for customizable residential apartment cluster mailboxes or commercial office document drops.	Capable of being mounted with only a small gap between boxes, for customizable residential apartment cluster mailboxes or commercial office document drops.	Capable of being mounted within a brick column, post mounted individually or as a cluster with the use of a 2 box, 3 box, or 4 mailbox spreader bar.	Capable of being mounted within a brick column, post mounted individually or as a cluster with the use of a 2 box, 3 box, or 4 mailbox spreader bar.	Capable of being mounted within a brick column, post mounted individually or as a cluster with the use of a 2 box, 3 box, or 4 mailbox spreader bar.

Product Description

The In Ground Steel Mounting Post by Mail Boss is made of heavy-duty galvanized 10- and 14-gauge galvanized steel with a durable powder-coated finish. Use this 43″ in-ground post to mount any curbside Mail Boss locking mailbox. The In Ground Post should be buried approximately 12″ in ground in order for the incoming mail slot of the Mail Boss mailboxes to be within USPS specifications of 41″-45″ above the road side surface. This post will fit securely over a treated wooden 4″x4″ post for deep installations and reinforcement with rebar stakes.

From the Manufacturer

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.

Product information

Technical Details

Manufacturer

‎Mail Boss

Part Number

‎7121

Item Weight

‎13 pounds

Product Dimensions

‎43 x 4 x 4 inches

Country of Origin

‎China

Item model number

‎7121

Is Discontinued By Manufacturer

‎No

Color

‎Black

Style

‎In-Ground

Finish

‎Powder-Coated

Material

‎Galvanized Steel

Pattern

‎Post

Item Package Quantity

‎1

Included Components

‎Mailbox Post, Installation Hardware & Instructions

Batteries Included?

‎No

Batteries Required?

‎No

Warranty Description

‎Limited Lifetime Warranty Against Manufacturer Defects

Additional Information

ASIN

B000VYL1P8

Customer Reviews

4.8 3,705 ratings

4.8 out of 5 stars

Best Sellers Rank

#4,199 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
#1 in Mailbox Posts

Date First Available

August 17, 2005

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Compare with similar items

	This Item Mail Boss 7121, Black In-Ground Mounting Post, 43 x 4 x 4 inches, for Use with Mailbox	Recommendations ARCHITECTURAL MAILBOXES Architectural Mailboxes APK000AM Post Anchor Kit Accessory, No Size, Pine	dummy ARCHITECTURAL MAILBOXES Architectural Mailboxes 7511B-10 Coolidge Post, Black	dummy Mail Boss 7120, Granite In-Ground Mounting Post, 43 x 4 x 4 inches, for Use with Mailbox, Medium	dummy Mail Boss 7122 Ground Mounting Post, 43 x 4 x 4 inches, for Use with Mailbox, Cream White
	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart
Price	-5% $75.95 List: $79.99	-12% $26.33 List: $29.99	-27% $25.64 List: $34.99	$79.99	-5% $75.99 List: $79.99
Delivery	Get it as soon as Sunday, May 12	Get it as soon as Sunday, May 12	Get it as soon as Sunday, May 12	Get it as soon as Sunday, May 12	Get it as soon as Sunday, May 12
Customer Ratings	4.83,705	4.267	4.5321	4.83,705	4.83,705
Sturdiness	4.7	3.7	3.6	4.7	4.7
Easy to install	4.5	4.2	4.3	4.5	4.5
Style	4.7	—	—	4.7	4.7
Easy to lock	4.5	—	—	4.5	4.5
Sold By	Amazon.com	Amazon.com	Amazon.com	Amazon.com	Amazon.com

Customer reviews

4.8 out of 5

3,705 global ratings

How customer reviews and ratings work

Customers say

Customers like the appearance, value, ease of installation, and quality of the mailbox post. For example, they mention it looks good, is worth the price, and is easy to install. That said, opinions are mixed on fit.

AI-generated from the text of customer reviews

298 customers mention286 positive12 negative

Customers are satisfied with the quality of the hardware. They mention that it's super sturdy, heavy duty, and doesn't scratch easily. The paint looks like it'll last, and the post seems firm. Overall, most are happy with the product's quality and functionality.

"...It looks beautiful and sturdy and super easy to install." Read more

"...i had low expectations to be honest, but it's heavy duty! doesn't scratch easily, doesn't seem like a cheap powder coat, or vinyl wrap, etc...." Read more

"...The steel walls of the post are roughly 1/16” thick and quite sturdy...." Read more

"...It is a good post and the box fits on it nicely." Read more

107 customers mention104 positive3 negative

Customers are satisfied with the appearance of the mailbox post. For example, they mention it's very nice looking, elegant, and simple. Some say that the paint is nice and the laminate is lovely to look at. Overall, most are happy with the product's appearance.

"...It looks beautiful and sturdy and super easy to install." Read more

"...but insanely easy to install. not shiny at all! actually looks like an expensive wood finish! highly recommend!" Read more

"...review for the mail box that attached to the top of this post - Shper clean looking seems well printed or painted - would recommend" Read more

"...That said the laminate is LOVELY to look at. It looks like a well stained/prepared post with much more strength and none of the work of a wood post." Read more

97 customers mention97 positive0 negative

Customers find the installation of the mailbox to be easy. They mention that the mounting plate is simple and easy to slide onto the 3 1/2" by 3 1/2" post. They also say that it's easy to attach the matching box and sturdy post. Customers also appreciate the good instructions. Overall, most are happy with the ease of installation.

"...It looks beautiful and sturdy and super easy to install." Read more

"...but insanely easy to install. not shiny at all! actually looks like an expensive wood finish! highly recommend!" Read more

"...Installation of the mailbox on the post once it was installed was easy and quick." Read more

"Easy to install. It looks amazing, and strong - oh my word!..." Read more

26 customers mention20 positive6 negative

Customers like the value of the mailbox post. They say it's worth the price, works very good, and is a great investment. Some say it provides a pricey lesson learned for careless drivers. Overall, most are satisfied with the value and quality of the product.

"Easy to insrall worth tge money ." Read more

"Good accessory when buying a heavy duty locked mailbox. The two together make a safe, secure and good looking mailbox" Read more

"...IT was very easy to install and very solid. Great product at a great price. Thank you" Read more

"...it back cause it seems Im not the only one that is getting a useless post for $90...." Read more

62 customers mention33 positive29 negative

Customers are mixed about the fit of the mailbox. Some mention that it fits perfectly over the post and adds just the right amount of appeal, while others say that it's too short for holding a standard base plate for a normal mailbox.

"...It is a good post and the box fits on it nicely." Read 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...." Read more

"Fit just right, good support." Read more

"...are using a 4x4 with a ground spike and the Mail Boss 7529 it is way too tall...." Read more

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Top reviews from the United States

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Mr. S

Sturdy Good Looking Mailbox

Reviewed in the United States on April 9, 2024

Color Name: BronzeVerified Purchase

I bought separately:
Mail Boss 7528V Mailbox
Mail Boss 7129 Surface Mount
Mail Boss, Bronze 7158 Surface Mount Base Plate

Replaced our 30 years old wood post with the Mail Boss brass Mailbox.

It looks beautiful and sturdy and super easy to install.

2 people found this helpful

Helpful

jenn

epic!

Reviewed in the United States on February 17, 2024

Color Name: Wood GrainVerified Purchase

this thing is gorgeous! i had low expectations to be honest, but it's heavy duty! doesn't scratch easily, doesn't seem like a cheap powder coat, or vinyl wrap, etc. not great quality! i bought this to cover an old broken post, until i could find a big one i liked that was affordable...(they're really expensive) but tbh i think this is will be permanent. thinking of adding a small raised brick/stone flower bed at the bottom. but insanely easy to install. not shiny at all! actually looks like an expensive wood finish! highly recommend!

3 people found this helpful

Helpful

dallaspatents

Well made post but probably will need a longer wood beam inside it to extend length

Reviewed in the United States on August 10, 2017

Color Name: BlackVerified Purchase

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.

132 people found this helpful

Helpful

Norman Quarles

Good post

Reviewed in the United States on April 24, 2024

Color Name: BlackVerified Purchase

This is the post that goes with the mailbox I previously reviewed. It is a good post and the box fits on it nicely.

Helpful

Lordshmeee

Works great with mailbox

Reviewed in the United States on March 14, 2024

Color Name: Wood GrainVerified Purchase

Left another review for the mail box that attached to the top of this post - Shper clean looking seems well printed or painted - would recommend

Helpful

AnneMarie

Easy to install

Reviewed in the United States on October 15, 2023

Color Name: Wood GrainVerified Purchase

Easy to install. It looks amazing, and strong - oh my word!
I already had a post in the ground from a previous box and I was going to use that as my inside post. Sadly, that post was in concrete and due to the depth of the concrete and height of the new steel post I couldn't use that.
So be prepared to dig a new hole, set a new wood post, do some math for the height of the ground to the bottom of the new box and depth of the new hole needed to get it all the right height for the USPS.
It's just not a case of remove the old sleeve or mailbox and slap this new one over it. The new one would be too tall.
THe laminate on the post is also fragile so don't brush it with the rake or shovel and a skirt of stone or concrete will keep the mower or weed machine at bay. That said the laminate is LOVELY to look at. It looks like a well stained/prepared post with much more strength and none of the work of a wood post.

2 people found this helpful

Helpful

anonymous

Post work s well with secured mailbox

Reviewed in the United States on March 15, 2024

Color Name: BlackVerified Purchase

Post looks good with secured mailbox.

Helpful

Joseph S.

Solid

Reviewed in the United States on April 14, 2024

Color Name: BlackVerified Purchase