I believe the Amiga version of Pine requires a complete ixemul setup. Which ixemul, itself, is an enigma, wrapped in a mystery, wrapped in a giant steaming turd.
And, really, the better question might be why you'd want Pine on an Amiga? Back 15 years ago or so I used to use it through a unix (Solaris, I think?) terminal I dialed into at my school. It almost, sorta, worked for plain text messages. That is about the best I can say for it. I can't imagine wanting to use it today. I don't think it can even comprehend a multi-part MIME message. I seem to remember it just displays the text/plain portion and then presents you with a giant block of uuencoded crap at the end.