Depends on the content of the letter and who sent it. If it’s from someone I know, I would probably respond with a text unless the letter was letting me know they decided to get rid of their phone and go off the grid or something like that. The last hand written letter I did receive was some kind of repentance someone had to do for the Mormon church. I know they had to send a hand written letter to everyone in my apartment building, not sure if that extended into the other buildings and neighborhood nearby. But yeah, they ain’t getting a response, I wanna stay off their radar