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macOS Spelling - Automatic By Language

Postbox uses the macOS system dictionary service. By default, Postbox will correct spelling with respect to the default language, but it can be changed so that languages are detected automatically. When auto-detect is turned on, words that are valid words in other languages will not appear as mispellings when composing a message in your current language. Here's how: 

  • Open the Config Editor
  • Type "pb.osx_spellchecker.auto_languages" into the "Filter:" textbox.
  • Double-click on the row for pb.osx_spellchecker.auto_languages
  • Change the value from False to True.
  • Restart Postbox.