Fort Knox Mailbox Fortress – Mailbox Big Box
Mailbox Big Box


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Fort Knox Mailbox Fortress



As the name suggest the Fort Knox Fortress mailbox is a serious mail safe house. The ultimate locking mailbox is just shy of 100 pounds of steel and will ensure the security of your mail and protect you and your family from identity theft.


With the same 2 weeks storage as the Fort Knox Large Standard Mailbox the Fortress differs with the upgrades of a couple of extra pounds of steel, an outgoing mail slot, a smart red mail flag and a nice improvement in it's 'I mean business' look.


The guys here at Mailbox Big Box think it's one of the best-looking mailboxes we sell. Installed together with a Fort Knox post and the newspaper holder in glossy black, it could have easily been called the Terminator instead of the Fortress!


If mail security is your number one priority when choosing a mailbox. Look no further than the famous Fort Knox Mailboxes - commonly described as a safe on the top of a post!


Our Fort Knox Mailbox Fortress has an anti-fishing measure with nearly 6 inches of metal extension shelf at the incoming mail slot so if someone were to try and put a “fishing line” down into the box to grab the mail, the mail would catch on the extension shelf, drop back down, and would not come out of the incoming mail slot.


Shop with confidence as Mailbox Big Box proudly offers the lowest prices available anywhere on all Fort Knox Mailboxes





  • 2 weeks of mail storage
  • Built with 98 pounds of steel
  • 2 high-security tubular keys
  • 7 pin tubular lock
  • Hand welded 1/4" steel shell and 3/16" reinforced steel doors
  • Accepts small parcels
  • 3" x 11 1/2" outgoing mail compartment
  • Steel powder coated red mail flag
  • Powder coated inside and out for durability
  • Free address numbers for the front door




  • Can be installed in masonry applications, a breakaway post and other post materials 
  • Pre-drilled for the Fort Knox Fortress in-ground post



Optional Add-on Accessories  

  • 57" steel post - designed for an in-ground installation
  • High security slam lock for locked up packages with 2 keys
  • Newspaper box - comes pre-welded to your Fort Knox Mailbox post
  • The Fortress is highly customizable with rear door access, premium grade locks, extra keys, mail trays and more. Use the chat window below to let us know what additional options you need.






About Fort Knox Mailboxes

Non-customized order - Dispatches in 3 - 5 working days
Customized order - Dispatches in 7 - 10 working days