JavaMail with Gmail: 535-5.7.1 Username and Password not accepted

Question

I get this error when I try to send a mail using JavaMail API. I am sure that the username and password are 100% correct. The Gmail account which I'm connecting is an older account, because they say it takes time for it to work with new accounts.

DEBUG SMTP RCVD: 535-5.7.1 Username and Password not accepted. Learn more at

535 5.7.1 http://mail.google.com/support/bin/answer.py?answer=14257 x35sm3011668
wfh.6

javax.mail.SendFailedException: Sending failed;
  nested exception is:
        javax.mail.AuthenticationFailedException
        at javax.mail.Transport.send0(Transport.java:218)
        at javax.mail.Transport.send(Transport.java:80)
        at Main.(Main.java:41)
        at Main.main(Main.java:51)

and this is my code:

import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;

public class Main
{
    String  d_email = "[email protected]",
            d_password = "pass",
            d_host = "smtp.gmail.com",
            d_port  = "465",
            m_to = "[email protected]",
            m_subject = "Testing",
            m_text = "testing email.";

    public Main()
    {
        Properties props = new Properties();
        props.put("mail.smtp.user", d_email);
        props.put("mail.smtp.host", d_host);
        props.put("mail.smtp.port", d_port);
        props.put("mail.smtp.starttls.enable","true");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.debug", "true");
        props.put("mail.smtp.socketFactory.port", d_port);
        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.fallback", "false");

        SecurityManager security = System.getSecurityManager();

        try
        {
            Authenticator auth = new SMTPAuthenticator();
            Session session = Session.getInstance(props, auth);
            session.setDebug(true);
            MimeMessage msg = new MimeMessage(session);
            msg.setText(m_text);
            msg.setSubject(m_subject);
            msg.setFrom(new InternetAddress(d_email));
            msg.addRecipient(Message.RecipientType.TO, new InternetAddress(m_to));
            Transport.send(msg);
        }
        catch (Exception mex)
        {
            mex.printStackTrace();
        } 
    }

    public static void main(String[] args)
    {
        Main blah = new Main();
    }

    private class SMTPAuthenticator extends javax.mail.Authenticator
    {
        public PasswordAuthentication getPasswordAuthentication()
        {
            return new PasswordAuthentication(d_email, d_password);
        }
    }
}

Answer 1

I had same issue : I refer this link, I have followed below steps it worked for me.

By default Gmail account is highly secured. When we use gmail smtp from non gmail tool, email is blocked. To test in our local environment, make your gmail account less secure as

1. Login to Gmail.
2. Access the URL as https://www.google.com/settings/security/lesssecureapps
3. Select "Turn on"