Good question. In most rural areas, mailboxes are considered “permitted obstructions” as long as they meet USPS height and distance standards (41–45 inches tall, set back from the road edge).
An anchored post isn’t illegal—but a rigid post made of steel pipe without a breakaway feature could be a liability. That’s why I recommend wooden posts and breakaway bolts.
The chain just stops the post from flying into a field. It doesn’t make the post immovable.
What if the snowplow driver gets hurt?
Extremely unlikely. Plows are heavy machinery designed to hit curbs, rocks, and debris. A wooden mailbox post with a buried chain will damage the plow blade before it hurts the driver.
Most drivers actually prefer anchored posts because they don’t become flying projectiles.
Can I use this for a decorative mailbox on a brick base?
No. Brick or stone mailboxes are dangerous because they don’t break away on impact. Never anchor a hardscape mailbox near a road. The chain trick is for wooden posts only.
How deep is deep enough for a frost-proof anchor?
In cold climates (northern US, Canada), dig 36–42 inches. Frost heave can push a shallow post right out of the ground over winter. The chain won’t help if the whole concrete block lifts.
Did you ever find out who Harold was?
I did, actually. An old-timer at the feed store told me Harold was a Korean War vet who didn’t like bullies.
He passed away in 2019, but his mailbox—the one I replaced—was still standing 15 years after he buried that chain. I left the anchor in the ground for the next owner.
Some legacies don’t need a name. They just need a little buried steel.
A Final Thought (And an Invitation)
I didn’t expect to fall down a rabbit hole of rural mailbox engineering on a random Saturday. But now I can’t stop noticing anchored posts along back roads.
You can spot them if you know what to look for: a little too solid, a little too stubborn, standing straight while everything around them gets knocked sideways.
