Shall I just snap it or cut off with reciprocating saw drill out what's left?All you can do is try to lever out with a screwdriver or chisel. When I had a post stuck in one of those, mine was one with a long spike that you hammer into the ground, I cut the post at the top of the post holder then broke what was left up using chisels and small axe. Once I had got part of it out the rest came out quite easily.
I am replacing the fence which is attached to it. Thought this post was looking a bit old. Would be easier to leave it. What do you think? It's been in there yearsThat's one way to do it. Are you going to replace the post for some reason or just taking the whole structure down?
You won't "just snap it". You will need to saw through it as much as possible from all sides if your saw is not big enough to go all the way through. You could chain drill it to make it as weak as possible but I think it would be easier in the long run to remove the base plate as stated above.
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