To run this example, you need two dependency libraries – javaee.jar and mail.jar, both are bundle in JavaEE SDK

package com.mkyong.common;
 
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
 
public class SendMailSSL {
 public static void main(String[] args) {
  Properties props = new Properties();
  props.put("mail.smtp.host", "smtp.gmail.com");
  props.put("mail.smtp.socketFactory.port", "465");
  props.put("mail.smtp.socketFactory.class",
    "javax.net.ssl.SSLSocketFactory");
  props.put("mail.smtp.auth", "true");
  props.put("mail.smtp.port", "465");
 
  Session session = Session.getDefaultInstance(props,
   new javax.mail.Authenticator() {
    protected PasswordAuthentication getPasswordAuthentication() {
     return new PasswordAuthentication("username","password");
    }
   });
 
  try {
 
   Message message = new MimeMessage(session);
   message.setFrom(new InternetAddress("from@no-spam.com"));
   message.setRecipients(Message.RecipientType.TO,
     InternetAddress.parse("to@no-spam.com"));
   message.setSubject("Testing Subject");
   message.setText("Dear Mail Crawler," +
     "\n\n No spam to my email, please!");
 
   Transport.send(message);
 
   System.out.println("Done");
 
  } catch (MessagingException e) {
   throw new RuntimeException(e);
  }
 }
}