said by nunya:
I wouldn't put it in concrete:
#1) it will hold water and make it rot faster.
I resolved this when I set the concrete by "doming" the concrete up towards the post. Water sheds away from the wood.
Also, I protected the wood with linseed oil prior to putting it into the concrete. Been in there 7 years and it is doing fine.
My mailbox is a mailbox-in-a-mailbox. Protected by a layer of concrete between the 2 boxes. Heavy as crap, thus requiring me to put the post in concrete.