javax.mail.AuthenticationFailedException: 535 5.7.3 Authentication unsuccessful

Question

I am sending e email using an SMTP error . I am getting Authentication unsuccessful. The username and password are correct. Am I doing something wrong.

The error logs are

import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class EmailSender{

    public static void main(String args[]) {
        String to = "[email protected]";            // sender email
        String from = "[email protected]";       // receiver email
        String host = "dkdkdd.xxx.com";                   // mail server host

        String login="dkkdkd";
        String pass="dkkdkd";
       Properties properties = System.getProperties();
        properties.setProperty("mail.smtp.host", host);
        properties.setProperty("mail.smtp.user", login);
        properties.setProperty("mail.smtp.password", pass);
        properties.setProperty("mail.smtps.ssl.enable", "true");
       // properties.setProperty("mail.smtp.auth", "true"); 

        Session session = Session.getDefaultInstance(properties); // default session

        try {
            MimeMessage message = new MimeMessage(session);        // email message
            message.setFrom(new InternetAddress(from));                    // setting header fields
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject("Test Mail from Java Program"); // subject line

            // actual mail body
            message.setText("You can send mail from Java program by using");

            // Send message
            Transport transport = session.getTransport("smtp");
            transport.connect(host, login, pass);
            Transport.send(message);
            System.out.println("Email Sent successfully....");
        } catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }

}

The error is

DEBUG SMTP: AUTH NTLM failed Exception in thread "main" javax.mail.AuthenticationFailedException: 535 5.7.3 Authentication unsuccessful

at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:826)
at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:761)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:685)
at javax.mail.Service.connect(Service.java:317)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)

Answer 1

Had the same issue. It's an MS Exchange error that you receive. You are probably not allowed to use your email to send an email via a relay. The administrator of the Exchange server needs to give the rights to do that.

It has nothing to do with a configuration problem on the Java side.