       if(postmanOpened) {                                       // postman just closed 
          if(proximitySmoothedVal > 10 + previousMail) {
             Serial.println("\t => NEW MAIL DELIVERED !!!");
-            deliveries++; // send notification to owner's device
+            deliveries++; // send notification to owner's device -  mails delivered
             postmanOpened = false;
             previousMail = proximitySmoothedVal;
          } else {

         }
      }
      if(ownerOpened){                                        // owner just closed

        ownerOpened = false;
        previousMail = proximitySmoothedVal;
        Serial.println("\t => mails cleared"); 
      }
    } else {

    if(ownerSmoothedVal > postmanSmoothedVal) {                                                  // owner opens letterbox
        Serial.println("\t => Owner opened letterbox");
        ownerOpened = true;
    } else {                                                                                     // postman opens letterbox
        Serial.println("\t => Postman opened letterbox");
        postmanOpened = true;
