iMessage - How to turn off read receipts

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Here's how to prevent the Messages app of Mac OS X Yosemite from sending read receipts. The procedure is as follows:
  • Open the Messages app.
  • Click on the Messages menu > Preferences.
  • Go to the Accounts tab.
  • Select an account (if multiple).
  • Uncheck "Send read receipts - Allow others to be notified when you have read their messages".