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getaaron / macos-messages-subject-field.md
Last active June 11, 2025 16:17
Enable iMessage (Messages) Subject Field in macOS Big Sur through Sonoma

Want the Subject field (for bold iMessages) in macOS’ Messages app?

  1. Quit Messages
  2. Open Terminal
  3. Run defaults write com.apple.MobileSMS MMSShowSubject 1
  4. Start Messages

This worked for me on a fresh install of macOS 14.1.1 (23B81) (new Mac mini).

Note: On modern versions of macOS, you must enable Privacy & Security > Full Disk Access for your Terminal app in System Settings.