Enviar email usando java.mail

import java.util.Properties;
import javax.activation.CommandMap;
import javax.activation.MailcapCommandMap;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class EnviarEmail {

	private String host = "smtp.mail.yahoo.com.br"; /* endereço do servidor smtp */

	public class SMTPAuthenticator extends Authenticator {
		@Override
		public PasswordAuthentication getPasswordAuthentication() {
			String username = "[email removido]";
			String password = "xxxxxxxxx";
			return new PasswordAuthentication(username, password);
		}
	}

	public void EnviarEmailPara(String para, String assunto, String mensagem)
			throws Exception {
		String from = "[email removido]";
		String fileAttachment = "";

		Properties mailProps = System.getProperties();

		mailProps.put("mail.smtp.host", this.host);

		Authenticator auth = new SMTPAuthenticator();
		Session session = Session.getDefaultInstance(mailProps, auth);

		mailProps.put("mail.smtp.auth", "true");
		mailProps.put("mail.debug", "true");
		mailProps.put("mail.smtp.debug", "true");
		mailProps.put("mail.mime.charset", "ISO-8859-1");
		mailProps.put("mail.smtp.port", "587");

		MailcapCommandMap mc = (MailcapCommandMap) CommandMap
				.getDefaultCommandMap();
		mc
				.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
		mc
				.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
		mc
				.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
		mc
				.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
		mc
				.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
		CommandMap.setDefaultCommandMap(mc);

		// Definir mensagem
		MimeMessage message = new MimeMessage(session);
		message.setFrom(new InternetAddress(from));
		message.addRecipient(Message.RecipientType.TO,
				new InternetAddress(para));
		message.setSubject(assunto);

		// Criar parte da mensagem
		MimeBodyPart messageBodyPart = new MimeBodyPart();

		// Texto da mensagem
		messageBodyPart.setText(mensagem);

		Multipart multipart = new MimeMultipart();
		multipart.addBodyPart(messageBodyPart);

		// Enviar parte da mensagem
		message.setContent(multipart);

		message.setContent(mensagem.toString(), "text/html");

		// Enviar toda a mensagemSend the message
		Transport.send(message);
	}

}

public class testaEnvia {
	public static void main(String[] args) {
		EnviarEmail enviarEmail = new EnviarEmail();
		try {
			enviarEmail.EnviarEmailPara("[email removido]",	"teste", "testando aplicativo");
		} catch (Exception ex) {
			ex.printStackTrace();
		}

	}

}