How to trigger to send email? PLEASE HELP

Using Arduino Programming Questions
1

how to trigger,what is the code?

2 
  // Check if temperature is above threshold and if it needs to send the Email alert
    if(temperature > inputMessage3.toFloat() && inputMessage2 == "true" && !emailSent){
      String emailMessage = String("Temperature above threshold. Current temperature: ") + 
                            String(temperature) + String("C");
      if(sendEmailNotification(emailMessage)) {
        Serial.println(emailMessage);
        emailSent = true;
      }
      else {
        Serial.println("Email failed to send");
      }    
    }
    // Check if temperature is below threshold and if it needs to send the Email alert
    else if((temperature < inputMessage3.toFloat()) && inputMessage2 == "true" && emailSent) {
      String emailMessage = String("Temperature below threshold. Current temperature: ") + 
                            String(temperature) + String(" C");
      if(sendEmailNotification(emailMessage)) {
        Serial.println(emailMessage);
        emailSent = false;
      }
      else {
        Serial.println("Email failed to send");
      }
    }
  }
3

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