I’m interested in a good Star Wars play by post as well. The one I was a part of died years ago and I haven’t been able to find any since then. Recently I started playing Star Wars Combine, it’s a lot slower paced than I’m used to as actions are based in real time. Flying out of the starting system took me almost 18 hours.
With Disney owning the rights now it is going to become even harder as well. But there are still plenty of the Star Wars RPG books out there and a play by post could always be created using them. West End games had a D6 version and Fantasy Flight Games has their own version as well.