How to access smtp.gmail.com or other to send email

Hi.

Can you fix this code to send only 1 email when it trigger the sensor,right now when sensor trigger it send alot of mail. thank you.

#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>
int LED = 13;                // choose the pin for the LED
int SENSOR = 2;               // choose the input pin (for SENSOR sensor)
int VAL =digitalRead(SENSOR);                    // variable for reading the pin status
int SENSORS = LOW;           

// this must be unique
byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0x59, 0x67 }; 
// change network settings to yours
IPAddress ip( 192, 168, 0, 32 ); 
IPAddress gateway( 192, 168, 0, 1 );
IPAddress subnet( 255, 255, 255, 0 );

char server[] = "mail.smtp2go.com"; 
int port = 2525; // You can also try using Port Number 25, 8025 or 587.

File myFile;

EthernetClient client;

void setup()
{

  Serial.begin(9600);
  pinMode(LED, OUTPUT);      // declare LED as output
  pinMode(SENSOR, INPUT);     // declare sensor as input
  digitalWrite(LED, LOW);
  
Ethernet.begin(mac);
delay(2000);
Serial.println(Ethernet.localIP());
Serial.println(F("Ready. Press 'e' to send."));

}


void loop(){

 if (digitalRead(SENSOR) == HIGH) {            
    digitalWrite(LED, HIGH);  // turn LED ON
  ////delay (300);
    
    if (SENSORS == LOW) {
      Serial.println("Motion detected!");
    SENSORS = HIGH;
    }
  } 
  else {
      digitalWrite(LED, LOW); // turn LED OFF
 
      if (SENSORS == HIGH){
      Serial.println("Motion ended!");
      SENSORS = LOW;
    }
  }
  
byte inChar;

inChar =  digitalRead(SENSOR);               /// Serial.read();  

if(inChar == HIGH  )
{
if(sendEmail()) Serial.println(F("Email sent"));
else Serial.println(F("Email failed"));
}
}

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

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

if(!eRcv()) return 0;

Serial.println(F("Sending hello"));
// replace 1.2.3.4 with your Arduino's ip
client.println("EHLO 192.168.0.31 ");
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 encoded user
client.println(F("yyyyyyyyyyyyyyyyy")); 


if(!eRcv()) return 0;

Serial.println(F("Sending Password"));
// change to your base64 encoded password
client.println(F("xxxxxxxxxxx")); 


if(!eRcv()) return 0;

// change to your email address (sender)
Serial.println(F("Sending From"));
client.println("MAIL From: <hanluu@hotmail.com>");
if(!eRcv()) return 0;

// change to recipient address
Serial.println(F("Sending To"));
client.println("RCPT To: <hanluu@gmail.com>");
if(!eRcv()) return 0;

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

Serial.println(F("Sending email"));

// change to recipient address
client.println("To: <hanluu@gmail.com>");

// change to your address
client.println("From: <hanluu@hotmail.com>");

client.println("Subject: Your Subject"); 

client.println("Hi! Simple test message");

client.println(".");

if(!eRcv()) return 0;

Serial.println(F("Sending QUIT"));
client.println("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;
}


void efail()
{
byte thisByte = 0;
int loopCount = 0;

client.println(F("QUIT"));

while(!client.available()) {
delay(1);
loopCount++;

// if nothing received for 10 seconds, timeout
if(loopCount > 10000) {
client.stop();
Serial.println(F("\r\nTimeout"));
return;
}
}

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

client.stop();

Serial.println(F("disconnected"));
}