Mail app malfunction
How to close mail app so I can log out?
MacBook Air 13″, macOS 11.6
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Mail menu -> Quit Mail.
If the menubar is invisible, hold the escape key to reveal it again.
If it is grayed out, make sure that Window menu -> Activity, has no pending tasks.
If it is grayed out and there are no pending tasks, you can command-option-escape to force quit the Mail application by selecting it, and hitting Force Quit.