Board Thread:Questions and Answers/@comment-24384762-20150409132713/@comment-25205196-20150409193617

You can't use the inbox to send or receive mail. It's where you get membership notices (requests, invites, rejections,...) so you have no control over it. I don't think there are any plans on making it a true mail system. Neighborhood leaders have to use the chat to communicate, or outside-game means. There's recently been a discussion on how social the game truly is at http://forum.supercell.net/showthread.php/551274-How-social-is-Hay-Day and why interaction might be limited. There are some interesting thoughts.