What is the name of your state (only U.S. law)? Mass.
So I just moved into a quaint small NE town that was not big on mailboxes. No one on my street has one, we live about 1/4 mile and busy intersection from the town Post Office. After the 3rd day of my wife playing frogger with our 3 kids to get the mail she decided we need a mailbox. I spoke to the Postmaster, it's permissable to have one it just needs to be on the opposite side of the street due to the route (they cannot change it). So I spoke neighbor's wife about 3 months ago and she stated her husband would be livid if we destroyed the historic charm of the neighborhood with a mailbox. Last weekend I see him outside and stroll over to ask him directly (mind you I aware that there is an easement that covers the first 3 feet of both of our properties). He promptly tells me if I put one up he will rip it down., can walk to the post office like everyone else and he's tired of young people like me buying houses in town and trying to change everything. I am stuck here, I need a mailbox and ahve the legal right to place one in the easement zone but I don't want to be a crappy neighbor.
P.S. My wife thinks I should get a Big Billy Bass mailbox and plunk 2 inches beyond the easement line.