Out of nowhere, my mail app on my new rMBP has stopped working. It takes a very long time to load my messages and freezes when you virtually make any action in the application. For instance, if I try to go to the preferences from the top bar, it will freeze. Also, I cannot quit the app normally and have to force quit. What is the issue here and what should I do to fix this? Like I said, the app literally went from working one minute to being unusable the next. Thanks in advance.