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DoubleTick is an Email Tracking for Gmail and GSuite, adds the double check marks to your mail if it is read by recipient (Just like WhatsApp). Get whatsapp like double checkmarks when someone reads your email. Get Desktop Notifications when your email get read, You can also enable or disable these notifications from the settings. Free unlimited email tracking for Gmail and Google Apps for Work with real-time desktop notifications and WhatsApp like double tick marks in your sent box.