In Ohio, and probably other areas also (maybe national), There is a 
requirement aimed at reducing injuries , that anything near the road be 
frangible  (easily broken) if hit.  The post be no stronger than 4x4 
wood or 1.5" (maybe  1.25") pipe. Stronger than that, and if hit, you 
are liable, at least partially. Our township will promptly replace a 
mailbox hit by their snowplow. A variety of suspensions from chains to 
spring loaded arms are common around here also.

Martin Klingensmith wrote:
> Common in northern NY is to build a mailbox that either avoids snowplows
> by hanging from above, or "letting" the snowplow driver know that they
> hit your box, with concrete and steel.
> --
> Martin K
>
> Matthew Miller wrote:
>   
>> I bought a hard rubber mail box today. Hopefully, the new box will stand up
>> better to any future baseball bats than my old metal box did. If it were
>> summer, I would build a heavy duty mail box that would sting the hands of
>> whoever swung the bat; my idea for such a mail box is putting a smaller box
>> inside a larger one and filling the space between them with concrete cement,
>> and then painting the box bright orange. Let someone take a swing at my mail
>> box then!
>>
>> Matthew
>>
>>   
>>     
>
>   
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