Mac OS X - Disable Alerts for Messages from Unknown Contacts

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By default iMessage will display a notification each time you receive messages from unknown contacts. To disable this feature:
  • Open the Messages app.
  • Click on the Messages menu > Preferences.
  • Go to the General tab.
  • Clear the "Notify me about messages from unknown contacts" checkbox.
Jean-François Pillou

Jean-François Pillou - Founder of CCM
Better known as Jeff, Jean-François Pillou is the founder of He is also CEO of CCM Benchmark and digital director at the Figaro Group.

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