Setting up Arduino with SMTP2GO

/*
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"));
}