Problemas com JavaMail

/**
	 * Method sendMail.
	 * @param string
	 */
	private void sendMail(String mailCode) {

		// create some properties and get the default Session
		Properties props = new Properties();
		props.put("mail.smtp.host", getMailServer());
		props.put("mail.store.protocol", "smtp");
		props.put("mail.transport.protocol", "smtp");
		props.put("mail.smtp.user", getFrom());
		props.put("mail.smtp.host", getMailServer());

		// the session
		Session session = Session.getDefaultInstance(props, null);
		session.setDebug(true);

		// the email message
		MimeMessage email = new MimeMessage(session);

		try {

			// create and fill the first message part
			MimeBodyPart mbp1 = new MimeBodyPart();
			mbp1.setText(mailCode, "us-ascii");

			// create the Multipart and its parts to it
			Multipart mp = new MimeMultipart();
			mp.addBodyPart(mbp1);

			// sets data for the message
			email.setFrom(new InternetAddress(getFrom()));
			email.setSubject(getSubject());
			email.setSentDate(new Date());

			InternetAddress[] address = { new InternetAddress(getTo())};
			email.setRecipients(Message.RecipientType.TO, address);

			// add the Multipart to the message
			email.setContent(mp);

			// send the message
			Transport t = session.getTransport("smtp");
			t.connect();
			t.sendMessage(email, address);
			t.close();

		} catch (MessagingException mex) {

			mex.printStackTrace();

		}

	}

import java.io.*;
import java.util.Date;
import java.util.Properties;

import javax.mail.*;
import javax.mail.internet.*;