What size of fence post do I require for a 6ft high fence 75mm square or 100mm square

15year+ old post?I know that some people hate them but I use concrete fence posts and concrete gravel boards. If possible, the boards are 6” buried and 6” out.
Was brought back to life by a new member who is now gone.15year+ old post?

I expect it's rotted away by now.15year+ old post?
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