Add a mail box
Not only would it be nice to have private messaging but also specifically a mailbox. It could just sit in a post office in Origin and when you log in the game lets you know you have messages waiting. This feature would make it easier to communicate with players who may not be on at a certain time but may be your building neighbors. This would also help Sim9 communicate with players and possibly help associate activity for deletion of long standing objects. An auto message can be sent every so long of inactivity and if a reply is not made bricks standing outside of towns are either removed or returned to the players inventory. If someone were to take a break from the game it might simply just require them logging in every couple weeks or so to save their progress in the game.
This could be neat
I think this is a really good idea. Simply due to that fact that people all over the wrold are playing this game now and some of my new-found friend s play when I should have been in bed 4 hours ago. So, with this mailbox, players wouldn't have to wait and wait and wait for a certain player to come on to communicate with them. (Think citizen requests. Or even trade deals)