The Fortress
The Ultimate 1/4″ Steel Security Mailbox

The Fortress
The Ultimate 1/4″ Steel Security Mailbox

(8 customer reviews)

From: Original price was: $575.00.Current price is: $499.00.

Lock Options

Add a Rear Door

Built to Outsmart Mail Thieves

The Fortress is our best-selling mailbox for good reason. With the same outer dimensions as the Large Standard, it adds a designated outgoing mail compartment and a covered incoming slot with a pull-down handle for extra weather and theft protection. It’s constructed from ¼” thick steel with reinforced, recessed doors and a narrow mail slot to keep hands and tools out. Every detail is designed to block prying and protect your privacy.

For the Ones Who Think Ahead

You check your doors at night. You keep a stocked pantry. You notice details others miss. If that’s you, the Fortress matches your mindset. It’s not just a mailbox—it’s a steel barrier around your identity, your mail, and your peace of mind.

Meets all USPS Requirements

See Available Accessories for This Mailbox!

Description

This is How It Works!

The mail carrier will pull down on the handle, revealing the incoming mail slot at the top (11.5” W x 1.75” H). Your incoming mail will be inserted and will drop down into the locked compartment. You are the only one with a key! Your mail awaits you, safely protected in a fortress of armor.

The Fortress also has an outgoing capacity. When the handle is pulled down, an outgoing mail shelf, (completely enclosed, and separate from the incoming area), is behind the door, below the incoming mail slot. The Fortress comes with a flag. Your outgoing mail cannot be locked by postal standards, but it’s out of sight, behind a door.

The Fortress is pre-drilled on the bottom. 4 holes, 6 ¾” apart, and designed to fit our Large Posts. It can also be mounted to existing surfaces.

It comes with our amazing, thick powder-coating finish to combat all the elements.

The Fortress is USPS Postmaster General approved.

Special Features for the Fortress Mailbox:

  • 98 LBS. of steel for extreme mail security!
  • 2″ continuous welded steel hinge
  • Recessed door to prevent prying
  • All hand-welded design (no spot welds or rivets)
  • 1 3/4″ x 11 1/2″ Incoming mail slot
  • 8″ depth of recessed slot design to:
    • Accept small packages
    • Keep hands out!
  • 7 Pin Tubular lock (upgradable)
  • Brushed satin nickel pull
  • 2 heavy-duty magnets
  • High-performance powder coating inside and out
    • Standard Colors (Slate Gray or Glossy Black)
    • Special colors available for an additional cost
    • Online Color Chart!
  • Can be custom adjusted and upgraded:
    • Any custom solid powder coating color available (+$169 per order)
  • Free 1 3/4″ vinyl adhesive address numbers for the front door
    • Request specific numbers at the time of order
    • Larger side numbers, reflective numbers, and street names are available
  • Add a steel post (5″ x 5″ x 57″)
    • Surface mount post available
    • Curb Mounted (for installation on an existing sidewalk)
    • Ground Level (for installing at ground level)
  • *Rear Door access available for an additional cost (3 options, same price)
    • Front and rear doors keyed alike
      • If you purchase an upgraded lock, a quantity of 2 is required
    • Front fake door and fake lock. The door is welded shut on the inside.
    • No front door. It is replaced with a steel plate completely welded.
fortress cutaway
Additional information
POWDER COATING COLOR *

Glossy Black

,

Slate Gray

,

Custom Color + $169 (contact us for desired color)

Weight 95 lbs
Dimensions 23 × 12 × 12 in
POWDER COATING COLOR *

Glossy Black

,

Slate Gray

,

Custom Color + $169 (contact us for desired color)

Weight 48 lbs
Dimensions 57 × 5 × 5 in
Size

Large 57" In-Ground Post

,

Large 32" Surface Mount Post

,

Large 36" Surface Mount Post

Color

Glossy Black

,

Slate Gray

,

Custom Color – Cost added to mailbox

Reviews (8)

8 reviews for The Fortress
The Ultimate 1/4″ Steel Security Mailbox

  1. Elliot

    Thank you again – I was able to ship them to Hawaii overnight, and they were installed today. We really appreciate the quality, and my thanks to your staff!

  2. Dominic

    Eight years ago, I was plagued by kids pounding my mailbox with bats during baseball season. After replacing several boxes and much expense, it was time to look for a long term alternative. I found you! Of course, shortly after my new Ft Knox Box was first installed, it was tested (as evident by some wood splinters) yet came through with flying colors…and probably broke some idiot’s wrist, arm and shoulder. This weekend, though, my noble mailbox had its ultimate test: Some Einstein shot it with a shotgun!

    Yes, the paint job was damaged, as were its house numbers, but that shotgun blast was no match for your 1/4″ thick steel! Thanks again for a first-rate, excellent Made in the USA product!

  3. Kevin and Dianne N.

    Called today to request “Fort Knox Mailbox” replacement stickers for our mailbox. We installed this mailbox not long after we moved into this home almost 20 years ago. It was a “developed farm” and the locals were not inclined to stop using our three wooded acres as their beer party venue. When my son and I challenged them, they responded by knocking over the original wood post mounted mailbox. At that point, we bought our Fort Knox, and have not had an issue since!
    You’re awesome! Thank you!!

  4. Chris M.

    Hello, I just received (2) of your Fortress Boxes. These were definitely worth the wait! I am confident these will be our “forever” mailboxes. I really appreciate your company delivering premium quality and going to this level with the details. I am sometimes a difficult customer, but everything (including the packaging) was over the top. I will recommend your products whenever I have the chance. Thank you

  5. John S.

    The last box I purchased and installed got destroyed in less than a year, so I resolved to find a mailbox that could actually survive a bit of punishment. I ended up picking out The Fortress.
    Some fool just hit this box hard enough to completely obliterate their entire side-view mirror assembly (glass was completely shattered and only held together by the backing, and the plastic housing was in shards all over my driveway.) The Fortress, by comparison… is missing a small section of powdercoat, and stands ramrod straight as always. *Thank you* for making exactly what I needed. –

  6. Tim Johnson

    Just wanted to say thank you for an amazing mailbox. In the picture you can see they did not get into my mailbox so again thank you and my neighbors are asking what it is so I’m sending them your way. Thanks for the quality American made product.

  7. Tim J.

    I wanted a mailbox that would hit back if someone tried to take a bat to it, and this certainly fits the bill!

  8. Nick T.

    Last month I sent you a photo of my Ft. Knox Mailbox that was ‘attacked’ by a shotgun-toting idiot. Just wanted you to know my box is repainted, re-lettered and back on post. Learned from my postal carrier that others on my highway with those big-box cast aluminum mailboxes didn’t do as well. Those owners found their mailboxes in tiny pieces…only the post remained.

    The mail carrier was so impressed by your design, she has been spreading the word and so if you see a spike in sales from this area.
    Best regards,

    Nick T.

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FAQ
Shipping Options

When Will Your Mailbox Ship?

We have a lot of different models and options, so our inventory is always fluctuating.  We are currently very busy, and below are our average wait times.  If your mailbox is in stock, it will ship the same or next business day. Otherwise, here are our average wait times if not in stock*:

  • 10" Mailboxes (M1-LT & Small Standard): 1 week
  • 12" Mailboxes (Large Standard and Fortress): 1-2 weeks
  • 18" Mailboxes (Vacationer & Senator): 2-3 weeks
  • The Package Box, Vaults & CBUs: 2-4 weeks
  • Ballot Boxes: 4 weeks
  • Smaller accessories if shipping separate will ship the same or next business day
  • Custom work and custom Colors will add 1 week to the above time frames
  • Extra keys can take 10-12 days for delivery
  • FedEx Ground transportation: 1-5 Business Days
  • Freight transportation: 1-9 Business Days

*Larger quantities or custom orders will take longer.  Feel free to contact us with a more precise shipping date. 

All Products Ship USPS, FedEx or by Freight at no charge.

Fort Knox Mailbox, LLC. will choose the shipping method in which all items are shipped.  Specified shipping by the customer can add a shipping cost.

All keys will ship via USPS priority.  Expedited shipping is an option for a fee.

Our mailboxes, except for the Package Box, Vaults and our CBUs ship FedEx Ground.

If you order a quantity of 4 or more larger items (Mailboxes and Posts), your order will likely ship via Freight.

For freight shipments, if shipping to a business and/or have access to a forklift or loading dock, you can select this option for a discount.  If selected, and shipping is not to a business or you do not have a forklift or loading dock, then Fort Knox Mailbox, LLC. can charge for the misinformation after delivery.  Please make sure that the delivery information is correct.

Large Items & Larger Quantities Ship Freight

Please call us at (800)206-8067 or contact us here for all your shipping questions.

Order quantities of 4 or more mailboxes can ship freight depending on location and accessorials needed.

The T-Post for 3 generally ships either FedEx Ground or Freight. We will make the T-Post for 3 in two pieces (Not all welded together) and ship it FedEx ground to be securely bolted together at installation.

Locks & Keys ship USPS

All locks and keys ship free via USPS when ordered separately from a mailbox.  Expedited shipping is available for an additional cost.  Please Contact US for details and pricing.