MacMail stopped displaying the preview of each email in MacBook
Mac mail no longer is showing previews for emails
MacBook Pro 15″, macOS 10.12
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Is it just blank, or nowhere to show it?
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.