My mailboxes have disappeared?
Mailboxes have disappeared.
iMac 21.5″, macOS 10.15
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Who is your Mail provider?
In a Browser login to your WebMail, are the folders there?
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.