Body of messages is not showing in received mail.
Am unable to read email messages. It just shows sender and subject.
MacBook Pro 13″, macOS 10.15
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Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes.
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.