Here's an easy way to install a mailbox anchor for a 4x4 post. This no dig ground screw just threads into the ground with no tools and works with decorative mailbox posts/sleeves that slide over a 4x4. I've used these a few times and recommend them. They aren't as solid as a concrete of course but plenty study for a mailbox and easy to reposition if needed.
Buy the ground anchor here: https://amzn.to/3sqcrKx
Extra large mailbox: https://amzn.to/3e6bXR5
Check out another even EASIER no dig mailbox option: https://youtu.be/1OrCWGfBbso
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#mailbox #nodig #groundanchor