[{'role': 'user', 'content': "Analyze the following clause from a privacy policy and determine if it's fair or unfair. Also identify any privacy practices mentioned: Pixel tags enable us to send email messages in a format customers can read, and they tell us whether mail has been opened. We may use this information to reduce or eliminate messages sent to customers."}, {'role': 'assistant', 'content': 'This clause is unfair. The privacy practices mentioned are: Identifier_Cookie_or_similar_Tech_1stParty.'}]