Send secure mail via Google with Java

import java.io.File;

import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;

import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;


public class Mail {
    public static void main(String[] args) {
        try {
            // No attachments
            //new Email().sendSimpleMail("Test from Java", "**This email address is being protected from spambots. You need JavaScript enabled to view it.**", "**This email address is being protected from spambots. You need JavaScript enabled to view it.**", "Testing...", null);
            // One attachment
            new Email().sendSimpleMail("**This email address is being protected from spambots. You need JavaScript enabled to view it.**",
                "password", "Test from Java", "**This email address is being protected from spambots. You need JavaScript enabled to view it.**",
                "**This email address is being protected from spambots. You need JavaScript enabled to view it.**", "Testing...",
                new String[] { "/tmp/Auth.java" });
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }

    public static class Email {
        public void sendSimpleMail(String username, String password,
            String subject, String to, String from, String messageText,
            String[] attachmentPaths)
            throws AddressException, MessagingException {
            Properties mailProps = new Properties();
            mailProps.put("mail.transport.protocol", "smtp");
            mailProps.put("mail.smtp.starttls.enable", "true");
            mailProps.put("mail.smtp.host", "smtp.gmail.com");
            mailProps.put("mail.smtp.auth", "true");
            mailProps.put("mail.smtp.port", "465");
            //mailProps.put("mail.smtp.debug", "true");
            mailProps.put("mail.mime.charset", "UTF-8");
            mailProps.put("mail.smtp.socketFactory.port", "465");
            mailProps.put("mail.smtp.socketFactory.fallback", "false");
            mailProps.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");

            Authenticator auth = new GMailAuthenticator(username, password);
            Session session = Session.getDefaultInstance(mailProps, auth);

            Message message = new MimeMessage(session);

            message.setFrom(new InternetAddress(from));
            message.setRecipient(Message.RecipientType.TO,
                new InternetAddress(to));

            message.setSubject(subject);

            // Prepare the content for message + possible attachments
            BodyPart messageBodyPart = new MimeBodyPart();
            messageBodyPart.setContent(messageText, "text/html");

            // Container for all parts, including at least message and possibly attachments
            Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(messageBodyPart);

            for (int i = 0;
                    (attachmentPaths != null) && (i < attachmentPaths.length);
                    i++) {
                addAttachment(multipart, attachmentPaths[i]);
            }

            message.setContent(multipart);

            Transport.send(message);
        }

        private void addAttachment(Multipart multipart, String attachmentPath)
            throws MessagingException {
            MimeBodyPart attachmentPart = new MimeBodyPart();
            DataSource source = new FileDataSource(attachmentPath);
            attachmentPart.setDataHandler(new DataHandler(source));
            attachmentPart.setFileName(new File(attachmentPath).getName());
            multipart.addBodyPart(attachmentPart);
        }

        private class GMailAuthenticator extends Authenticator {
            private String username;
            private String password;

            public GMailAuthenticator(String username, String password) {
                this.username = username;
                this.password = password;
            }

            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        }
    }
}