Setting up Arduino with SMTP2GO

Step 1

/*

   Email client sketch for IDE v1.8.1 and w5100



*/



//Used Modules: Arduino Mega + W5100  Ethernet shield.



#include <SPI.h>

#include <Ethernet.h>

#include <SD.h>





// this must be unique

byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0x59, 0x67 };  

// change network settings to yours

IPAddress ip( 192, 168, 2, 2 );    

IPAddress gateway( 192, 168, 2, 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(115200);

  pinMode(4,OUTPUT);

  digitalWrite(4,HIGH);

  Ethernet.begin(mac);

  delay(2000);

  Serial.println(Ethernet.localIP());

  Serial.println(F("Ready. Press 'e' to send."));

    

}



void loop()

{

  byte inChar;



  inChar = Serial.read();

  

  if(inChar == 'e')

  {

      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 1.2.3.4");

  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("cm7zaXtrYY5kWXI=")); 

  



  if(!eRcv()) return 0;



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

// change to your base64 encoded password

  client.println(F("QmlcZzJGb5Nx"));  

  



  if(!eRcv()) return 0;



// change to your email address (sender)

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

  client.println("MAIL From: <sender@example.com>");

  if(!eRcv()) return 0;



// change to recipient address

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

  client.println("RCPT To: <recipient@example.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: Rachel <recipient@example.com>");



// change to your address

  client.println("From: Susan <sender@example.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"));

}