Send email with authentication

import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;

import java.util.Properties;


public class SimpleMail {

    private static final String SMTP_HOST_NAME = "smtp.myserver.com";
    private static final String SMTP_AUTH_USER = "myusername";
    private static final String SMTP_AUTH_PWD  = "mypwd";

    public static void main(String[] args) throws Exception{
       new SimpleMail().test();
    }

    public void test() throws Exception{
        Properties props = new Properties();
        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.host", SMTP_HOST_NAME);
        props.put("mail.smtp.auth", "true");

        Authenticator auth = new SMTPAuthenticator();
        Session mailSession = Session.getDefaultInstance(props, auth);
        // uncomment for debugging infos to stdout
        // mailSession.setDebug(true);
        Transport transport = mailSession.getTransport();

        MimeMessage message = new MimeMessage(mailSession);
        message.setContent("This is a test", "text/plain");
        message.setFrom(new InternetAddress("info@maixuanviet.com"));
        message.addRecipient(Message.RecipientType.TO,
             new InternetAddress("maixuanviet.com@gmail.com"));

        transport.connect();
        transport.sendMessage(message,
            message.getRecipients(Message.RecipientType.TO));
        transport.close();
    }

    private class SMTPAuthenticator extends javax.mail.Authenticator {
        public PasswordAuthentication getPasswordAuthentication() {
           String username = SMTP_AUTH_USER;
           String password = SMTP_AUTH_PWD;
           return new PasswordAuthentication(username, password);
        }
    }
}

NOTE: The JavaMail Authenticator is found in the javax.mail package and is different from the java.net class of the same name. The two don’t share the same Authenticator as the JavaMail API works with Java 1.1, which didn’t have the java.net variety.