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.

Very good and sturdy. Was easy to install and the appearance is nice. Very well secured and the sizing is great.

Excellent. Easy to put in the ground. Worked with my Mail Boss

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.

Well made. It fit over a 4x4x6 with ease. I did not have to plane it down or otherwise make any adjustments. Word to the wise, if you are placing this over a 4x4, leave about 2 inches between the top of the 4x4 and the top of the metal post. The bolts that come with the mailboxes orca xl mail box are about 1.25 inches long. I could not get these to enter the hole between the mailbox and the post. They seemed to wide for the holes in the mailbox and post? The bolts that come with the 7121 post are about .5 inches long and fit the hole for the mailbox and the post perfectly . Let's hope it lasts for years to come. There is no mechanism to attach the mailbox to the 4x4 that is inside the post. Only to attach the post to the mailbox. I have 6 inch lag bolts but did not use them, as it does not appear this type of attachment was designed. If you want a sturdy post that easily fits over a 4x4, this fits the task.

Durable, strong, well powdercoated/painted post. Easy to install, very secure, looks great, works well with mail boss mailbox. Average price.

installation was easy enough. attached the mounting plate to the post before setting it into the ground, that gave me reference points to meeting the postal measurement requirements. also, marked out 12" on the post. Dug the hole to about 16" and put in cinder rocks to help drain the hole when it rains.after the quikrete set, sliding the mailbox onto the mounting plate was simple and easy. however, I dropped a locking machine screw and for the life of me I couldn't find it. secured the mailbox to the mounting plate with the single remaining screw.I contacted mail boss to get the machine screw details to pick one up at the local hardware store. Dana provided me with the information and said that she could mail me the screw. I accepted as I am not lucky with matching hardware at stores.the box is attractive, sturdy and substantially secure for mail. Going to apply wd40 to the hinges and inside the lock to prevent rusting that other reviewers reported.mail boss was very responsive to my request and their support gives me confidence in the mail box.very happy with the purchase, delivery, ease of setup and mail boss support.

Well made, super solid mailbox post. Used for in-ground installation with a post extender.

The mailbox post is very sturdy and high quality. However, the mounting holes do not align with the Adoorn mailbox I ordered so the post is going back. A couple of things I wanted to note about the post.1. Be careful opening the box it comes in. It shipped in a single box with a layer of bubble wrap and additional cardboard around the ends. If you use a razor or something sharp to open the box and you dig too deep, you WILL scratch the post.2. The listing says the post is 43” tall. I measured it at 44.5” tall. This wouldn’t have impacted my ability to use it, but noting in case it impacts someone else.3. It came with the bolts to attach the mailbox to the top of the post. But it did NOT come with hardware to attach the metal post to the wooden post you are covering. The holes are predrilled but no hardware provided.4. And as I said before, it does not fit the mounting holes that come on the Adoorn mailbox. Had the holes matched, I would have kept the post. The Adoorn mailbox said that altering the holes or drilling that exposes raw metal on the mailbox voids their warranty and I’m not willing to do that.

Prima Vollpfosten :-)

Like how you can insert a 4 x 4 wooden post to help strengthen it

Beau fini. Un prix vraiment fantastique au moment de mon achat

Easy to install

Only one bolt was moving in/out easily, but other 2 needed a lot of torque & difficult to take out or screw in even with the best tools. The 4th bolt was … hammered in !!! head damaged by hammer, male & female threads totally destroyed, I had to cut the bolt off (no time for replacement). Found another replacement bolt, and fixed the 3 female threads with a specialized toolset. Took a bit of time, but I was able to use it.