Quit mail is greyed out in Mac Mail. There is nothing running in the background within mail and no pending mails to send, so I am unclear why it is doing this.
I can Force Quit, but that is hardly a user friendly solution.
This problem has only just started.
MacBook Pro (Retina, 13-inch, Late 2013), OS X Mavericks (10.9)
Go to the Apple Store and ask or call Apple Support. Apple Support is very helpful and can probably help you with this.
Please follow these directions to delete the Mail "sandbox" folders. In OS X 10.9 there are two sandboxes, while in earlier versions there is only one.
Back up all data.
Triple-click anywhere in the line below on this page to select it:
~/Library/Containers/com.apple.mail
Right-click or control-click the highlighted line and select
Services ▹ Reveal
from the contextual menu.* A Finder window should open with a folder named "com.apple.mail" selected. If it does, move the selected folder — not just its contents — to the Desktop. Leave the Finder window open for now.
Log out and log back in. Launch Mail and test. If the problem is resolved, you may have to recreate some of your Mail settings. You can then delete the folder you moved and close the Finder window. If you still have the problem, quit Mail again and put the folder back where it was, overwriting the one that may have been created in its place. Repeat with this line:
~/Library/Containers/com.apple.MailServiceAgent
Caution: If you change any of the contents of the sandbox, but leave the folder itself in place, Mail may crash or not launch at all. Deleting the whole sandbox will cause it to be rebuilt automatically.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combinationcommand-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.
Cannot quit mail
