ESP8266 & IFTTT - Why does this code not work ?

I am logging the level of a fluid tank using a Node MCU and posting the details to ThingSpeak server. Working fine the last two years.

Now I would like to get a E-Mail when the fluid level drops below a threshold and since this is not easy to do with Thingspeak, thought why not use the IFTTT ?

Can someone point me to a article or tutorial on a similar project ? I am also studying the various such projects but most of them either send a Tweet or interface with Alexa or Google Home.

Edit …

I have located a code and tried it … all configurations on IFTTT and the code below compile and run OK. However I am not getting any mail …. so what could be wrong ?

//Code for the www.MakeUseOf.com Wi-Fi connected Button tutorial by Ian Buckley
 
#include <IFTTTWebhook.h>
#include <ESP8266WiFi.h>
 
#define ledPin 2
#define wakePin 16
#define ssid "myssid"
#define password "mypwd"
#define IFTTT_API_KEY "mykey"
#define IFTTT_EVENT_NAME "RR_PushButton"
 
void setup() {
  Serial.begin(9600);
  while(!Serial) {
  }
  Serial.println(" ");// print an empty line before and after Button Press    
  Serial.println("Button Pressed");
  Serial.println(" ");  
 
  connectToWifi();
 
  IFTTTWebhook hook(IFTTT_API_KEY, IFTTT_EVENT_NAME);
  hook.trigger();
 
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);  
  delay(200);              
  digitalWrite(ledPin, LOW);
 
  ESP.deepSleep(wakePin);
}
 
 
void connectToWifi() {
  Serial.print("Connecting to: NAME "); //uncomment next line to show SSID name
  Serial.print(ssid);
  WiFi.begin(ssid, password);  
  Serial.println(" ");
  Serial.print("Attempting to connect: ");
 
  //try to connect for 10 seconds
  int i = 10;
  while(WiFi.status() != WL_CONNECTED && i >=0) {
    delay(1000);
    Serial.print(i);
    Serial.print(", ");
    i--;
  }
  Serial.println(" ");
 
  //print connection result
  if(WiFi.status() == WL_CONNECTED){
  Serial.print("Connected.");
  Serial.println(" ");
  Serial.print("NodeMCU ip address: ");
  Serial.println(WiFi.localIP());
  }
  else{
    Serial.println("Connection failed - check your credentials or connection");
  }
}
  
void loop(){
//if deep sleep is working, this code will never run.
Serial.println("This should never get printed");
delay(1000);
}