Oh actually I finished it, but I got the bad ending I'm afraid! That's why I want to try to obtain something better now.
Viewing post in Hope Springs: Penstroke comments
Oh excellent! There's three endings in total. The mailboxes each need a "Strange Invitation" specific to each. These are hidden in some scenes of the game that won't show a label to the player when next to them. Same can be said for the other hidden interactions that provide another ending. Happy hunting! :-)
I managed to solve the shrines puzzle indeed! But for the mailboxes I really have no clues. I noticed one has a dreamcatcher on it, and there's indeed a dreamcatcher in one of the save rooms, the one in the wagon, but I can't interact with it in any way. On another mailbox there's a lantern, but it's full of lanterns everywhere. As for the bell, I think I didn't see any around. I am definitely stuck on that...
So to give you a little more to go on, there's essentially three envelopes just hidden throughout the game. They can be hidden anywhere from slightly sticking out from behind something on a wall to floating I'm something else. Sorry for being a bit cryptic but don't want to spoil it too much for others. Hope that helps. :-)