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@fredtc
Aluminium binds with steel under galvanic corrosion, and over a period of years this bond can become incredibly strong, and hitting it with a mallet certainly won't work.
My advice would be to send it to the seatpost man, seriously. There's many things you can do, all of which will be a pain in the arse and most of which will damage that lovely paintwork. I've fought with many seatposts and it's never been worth it. Seeing as you got the frame for free you might as well spend a bit of cash to get it sorted
or just give it to me, it's probably not worth the bother...