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Clean up all other installed versions of Mailbutler, e.g. Whether you're running macOS Monterey or an earlier macOS, like Catalina or Mojave, the process of manually uninstalling apps remains relatively similar.( Note: If the Finder forbids deleting the app because it's open, please open up the Activity Monitor application (in the Utilities folder of your Applications folder) first, find Mailbutler in the list and terminate it Type the code: csrutil disable into the Terminal and press your Enter key. Click the Utilities and head to the Terminal. You can disable SIP by just following these steps: Enter Recovery Mode on your Mac. Move the Mailbutler application from your Applications folder to the Trash It makes it impossible for the user to remove any system app on your Mac, and in this case, the Mail app.Enter rm ~/Library/LaunchAgents/ and hit 'Enter' to execute the command (this is fine to fail for older versions of Mailbutler).Enter launchctl unload ~/Library/LaunchAgents/ and hit 'Enter' to execute the command (this is fine to fail for older versions of Mailbutler).Open up the Terminal app (in the Utilities folder of your Applications folder).Press Cmd+Shift+G on your keyboard again and enter /Library/Mail, then confirm.Remove the Mailbutler.mailbundle folder.Enter /Library/Mail/Bundles and confirm.Go to Finder and press Cmd+Shift+G on your keyboard.If for some reason, uninstallation using the steps described above does not work for you, please follow these steps to manually uninstall Mailbutler: How to manually uninstall Mailbutler in Apple Mail

In Mailbutler's menubar, go to Help -> 'Uninstall…'.

Going to the Finder and from the Applications folder, launch the Mailbutler app.

Please note: If you can't find the 'Uninstall Mailbutler…' menu item in Mail because the Plug-in couldn't be loaded, please uninstall by:

Uninstall mac mail