cannot log off off Apple laptop due to being unable to close mail. What can I do?
How do I log off mail when error message does not allow me to do so?
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You should be able to force quit the mail app by either,
Press these three keys together: Option, Command, and Esc (Escape). Or
choose Force Quit from the Apple menu in the upper-left corner of your screen. (This is similar to pressing Control-Alt-Delete on a PC.)
Then select the app in the Force Quit window and click Force Quit.
This should help:
How to force an app to quit on your Mac - Apple Support