I got error 530 5.7.0 from gmail server trying to send an email from Arduino and Ethernet screen

Question

I got error 530 5.7.0 from gmail server when trying to send an email from Arduino and Ethernet screen.

I want to send an email from my arduino uno forum. I bought an Ethernet screen for it. I found the code to send email using the Ethernet screen below, but I failed. The Gmail server said the “530 5.7.0” error code, but I don’t know what that means. What did I misunderstand?

/*
   Email client sketch for IDE v1.0.1 and w5100/w5200
   Posted December 2012 by SurferTim
*/

#include <SPI.h>
#include <Ethernet.h>

// this must be unique
byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0x59, 0x67 };  
// change network settings to yours
IPAddress ip( 10, 6, 0, 248 );    
IPAddress gateway( 10, 6, 0, 1 );
IPAddress subnet( 255, 255, 255, 0 );

// change server to your email server ip or domain
// IPAddress server( 1, 2, 3, 4 );
char server[] = "smtp.gmail.com";

EthernetClient client;

void setup()
{
  Serial.begin(9600);
  pinMode(4,OUTPUT);
  digitalWrite(4,HIGH);
  Ethernet.begin(mac, ip, gateway, gateway, subnet);
  delay(2000);
  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,25) == 1) {
    Serial.println(F("connected"));
  } else {
    Serial.println(F("connection failed"));
    return 0;
  }

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

// change to your public ip
  client.println(F("helo 1.2.3.4"));

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

// change to your email address (sender)
  client.println(F("MAIL From: <[e-mail]>"));

  if(!eRcv()) return 0;

// change to recipient address
  Serial.println(F("Sending To"));
  client.println(F("RCPT To: <[e-mail]>"));

  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: You <[e-mail]>"));

// change to your address
  client.println(F("From: Me <[e-mail]>"));

  client.println(F("Subject: Arduino email test\r\n"));

  client.println(F("This is from my Arduino!"));

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

  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;
}


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"));
}

Answer 1

, arduino. , , .

, : " STARTTLS". , SSL. , Google. , "Arduino Ethernet Shield" SSL. , SSL.

" PHPoC Shield Arduino" . , Arduino Library for PHPoC. . EmailClient " , .

/* arduino email client - send email to server directly */

#include "SPI.h"
#include "Phpoc.h"

PhpocEmail email;

void setup() {
  Serial.begin(9600);
  while(!Serial)
    ;

Phpoc.begin(PF_LOG_SPI | PF_LOG_NET | PF_LOG_APP);
//Phpoc.begin();

Serial.println("Sending email to server directly");

// setup From/To/Subject
email.setFrom("from_email_address", "from_user_name");
email.setTo("to_email_address", "to_user_name");  
email.setSubject("Mail from PHPoC Shield for Arduino");

// write email message
email.beginMessage();
email.println("Hello, world!");
email.println("I am PHPoC Shield for Arduino");
email.println("Good bye");
email.endMessage();

// send email
if(email.send() > 0)
  Serial.println("Email send ok");
else
  Serial.println("Email send failed");
}

void loop() {
}

. , , from_email_address, from_user_name, to_email_address to_user_name.

421-4.7.0.

, - Google. , - 530 5.7.0 gmail - PHPoC Shield Arduino.

- Google, .

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