Enable GPG Mail on macOS Mojave or newer

On macOS Mojave or newer you need to enable the plug-in after installation. To enable GPG Mail please

  • open Mail > Preferences > General > Manage Plug-Ins…
  • tick checkbox for GPGMailLoader.mailbundle
  • confirm with "Apply and Restart Mail"

After the restart GPG Mail will be loaded and Mail > Preferences > GPG Mail will show.