I noticed we didn't have one, and I think we should because what if we accidently deleted an important message? This has already happened to me and that is why we should have a trash folder. If we do delete our messages, that is where they would go. It shouldn't count about how much messages you have though. We should also have the option to permanently delete a message if we get a trash folder. We would also need one cause one day someone might get scammed, already made a dispute, and they wouldn't have that much proof because they deleted their messages!