My Mail does not open from the menu.
My Mail does not open from the menu.
MacBook Air 13″, macOS 10.12
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The Mail App itself or individual eMails?
Start with this...
Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes or more.
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.