Sometimes the data file for a mailbox can get partially corrupt. Common examples are clicking on an email then only to show a blank screen
Problem
- Message body appears in preview but when opened, body is blank.
Solution
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Select your Inbox
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Click Mail->Mailbox->Rebuild.
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The view will appear to go blank.
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This forces Apple Mail to reindex and recache the entire folder. Depending on the size of your mailbox this may take anywhere from a minute or two up to a few hours.
Important Notes.
- Remember that after you click “Rebuild”, the view will appear to go blank.
- To fix the blank view, select another folder like “Sent”, and then reselect Inbox.
- Do not rebuild if you are using Catalina until Apple fixes bugs related to that update.