Mac Mail Preferences show as a blank box with no options

If you see Mac Mail Preferences as a blank box with no options, try to follow these steps and the Preferences should start showing fine and allow you to manage your Signatures section in Mac Mail.

  1. Quit Mail app. Make sure you quit it (click "Activity Monitor" and check if Mac Mail is not working).
  2. Go to Finder and click Go>Go to Folder.
  3. Rename the ~/Library/Mail folder.
  4. Delete ~/Library/Containers/
  5. Open Mail app.

Then Apple Mail should download all IMAP folders.

When you check that all is ok, delete the renamed folder in ~/Library.

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