ESP8266: Using SENSOR INPUTS to send an E-MAIL

I'm really into this IoT stuff but I'm still amateur with how it mainly works.

Fortunately, I got a code to work and send an-email (finally!) using this:

I'm using a Wemos D1-Mini with ESP8266 as my micro-controller and a vibration switch sensor for the input.

Now, my next problem is to have the sensor input be read correctly and will only send an email IF the sensor reads anything. I tried but that's as good as I can get. Any help would be appreciated, as always!

#include <ESP8266WiFi.h>  // the ESP8266WiFi.h  lib
const char* SSID = "";
const char* PASS = "";
char server[] = "mail.smtp2go.com";
//ADC_MODE(ADC_VCC);


int sensorPin = A0;    // select the input pin for the vibration sensor
int motion = 0;  // variable to store the value coming from the sensor

WiFiClient client;
void setup()
{
  Serial.begin(115200);
  delay(10);
  Serial.println("");
  Serial.println("");
  Serial.print("Connecting");
  Serial.println(SSID);
  WiFi.begin(SSID, PASS);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi Connected");
  Serial.print("IPess: ");
  Serial.println(WiFi.localIP());


  // The code to read the sensor input.... any suggestions?
  motion = analogRead(sensorPin);
  String motionString = String(motion, 1);
  byte ret = sendEmail(motionString);

}

void loop()
{
// I have a feeling the motion sensor input must be here? 
}

byte sendEmail(String motion)
{
  byte thisByte = 0;
  byte respCode;

  if (client.connect(server, 2525) == 1) {
    Serial.println(F("connected"));
  } else {
    Serial.println(F("connection failed"));
    return 0;
  }
  if (!eRcv()) return 0;

  Serial.println(F("Sending EHLO"));
  client.println("EHLO www.example.com");

  if (!eRcv()) return 0;
  Serial.println(F("Sending auth login"));
  client.println("auth login");

  if (!eRcv()) return 0;
  Serial.println(F("Sending User"));
  // Change to your base64, ASCII encoded user
  client.println(""); // SMTP UserID

  if (!eRcv()) return 0;
  Serial.println(F("Sending Password"));
  // change to your base64, ASCII encoded password
  client.println("");//  SMTP Passw

  if (!eRcv()) return 0;
  Serial.println(F("Sending From"));   // change to your email address (sender)
  client.println(F("MAIL From: @gmail.com"));// not important

  if (!eRcv()) return 0;   // change to recipient address
  Serial.println(F("Sending To"));
  client.println(F("RCPT To: c@my"));

  if (!eRcv()) return 0;
  Serial.println(F("Sending DATA"));
  client.println(F("DATA"));

  if (!eRcv()) return 0;
  Serial.println(F("Sending email"));   // change to recipient address
  client.println(F("To: @my"));   // change to your address
  client.println(F("From: @gmail.com"));
  client.println(F("Subject: ORAL BEARDUINO ALERT!\r\n"));

  client.println(F("Toothbrush has been recently activated!"));
  client.print(F("Motion:"));
  Serial.println(motion);



  if (!eRcv()) return 0;
  Serial.println(F("Sending QUIT"));
  client.println(F("QUIT"));

  if (!eRcv()) return 0;
  client.stop();
  Serial.println(F("disconnected"));
  return 1;
}

byte eRcv()
{
  byte respCode;
  byte thisByte;
  int loopCount = 0;
  while (!client.available())
  {
    delay(1);
    loopCount++;     // if nothing received for 10 seconds, timeout
    if (loopCount > 10000) {
      client.stop();
      Serial.println(F("\r\nTimeout"));
      return 0;
    }
  }

  respCode = client.peek();
  while (client.available())
  {
    thisByte = client.read();
    Serial.write(thisByte);
  }

  if (respCode >= '4')
  {
    //  efail();
    return 0;
  }
  return 1;
}