Try this keyboard shortcut.
Option + Command + Esc
That should prompt the Force Quit window.
You can also force quit an app using Activity Monitor located in HD > Applications > Utilities
Select Mail under Process Name then Quit Process.
Message was edited by: CS
Currently Being ModeratedNov 14, 2013 7:37 PM (in response to Carolyn Samit)
Mine is still doing this. It hasn't properly closed since I installed Maverick. Even with the Mail update a few weeks ago, it will not properly Quit the application. I have to Force Quit or hard restart (which I never do) to close it.
It also freezes a bit during mail reading, not large files just normal text, and the fan will kick on as if the computer is in overdrive. No other applications running. Just Mail.
Any advice? All the forums with this problem have Force Quit as a solution which isn't what I am looking for.
Currently Being ModeratedNov 14, 2013 10:17 PM (in response to Brandonchamberlain)
Looks like the Mavericks upgrade has messed with a lot of people's installations, and some Apple applications (like Mail, or Safari) seem more highly impacted than third-parties'.
In your case, Mail appears to be gobbling up CPU cycles and RAM. You could install this little gem called atMonitor, highlight the Mail line in the main windows, then click on the "renice" button in the top right. You can then give it a "20" value (the lowest possible CPU grade for an application or service in OS X), then click on "Set and remember".
Mail should behave from then on, and close down gracefully when you ask it too, because you put a cap to its CPU usage.
One caveat: atMonitor must be running for the settings to take effect upon reboot. You can add it to your startup items.
There's another app called Dock Dodger that will prevent the atMonitor from showing in your Dock all the time.