Mac Mail
My Mail App on my Mac starts but doesn't "open". I get the error "no mailbox selected". I also does not Quit normally. I have to Force Quit. Any suggestions?
MacBook Pro 13″, macOS 11.0
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you should start with Troubleshooting email problems on your Mac - Apple Support
if that doesn't work, you can try Rebuild mailboxes in Mail on Mac - Apple Support