Properties properties = new Properties(); properties.put("mail.smtp.host", "smtp.example.com"); properties.put("mail.smtp.port", "587"); properties.put("mail.smtp.auth", "true"); Authenticator authenticator = new Authenticator() { @Override protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("username", "password"); } }; Session session = Session.getInstance(properties, authenticator); Message message = new MimeMessage(session); message.setFrom(new InternetAddress("sender@example.com")); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("recipient@example.com")); message.setSubject("Hello, World!"); message.setText("This is a test email."); Transport.send(message);