android send mail

Nekje sem našel tutorial za mail send preko android aplikacije.
Potegnil sem še jar, ampak mogoče ni tapravi, saj dobim exception:

11-05 16:55:42.578: E/AndroidRuntime(18730): Caused by: java.lang.NoClassDefFoundError: javax.mail.internet.MimeMultipart

11-05 17:17:51.028: W/dalvikvm(19141): Unable to resolve superclass of Lsi/test/MailSender; (499)
11-05 17:17:51.028: W/dalvikvm(19141): Link of class 'Lsi/test/MailSender;' failed
11-05 17:17:51.028: E/dalvikvm(19141): Could not find class 'si.test.MailSender', referenced from method si.test.MainActivity.sendMail

V eclipsu ta class sicer najdem... kakšna ideja?

Mail send izgleda takole:

package si.test;

import java.util.Date;
import java.util.Properties;
import javax.activation.CommandMap;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.activation.MailcapCommandMap;
import javax.mail.BodyPart;
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 MailSender extends javax.mail.Authenticator {
	private String _user;
	private String _pass;

	private String[] _to;
	private String _from;

	private String _port;
	private String _sport;

	private String _host;

	private String _subject;
	private String _body;

	private boolean _auth;

	private boolean _debuggable;

	private Multipart _multipart;

	public MailSender() {
		_host = "smtp.gmail.com"; // default smtp server
		_port = "465"; // default smtp port
		_sport = "465"; // default socketfactory port

		_user = ""; // username
		_pass = ""; // password
		_from = ""; // email sent from
		_subject = ""; // email subject
		_body = ""; // email body

		_debuggable = false; // debug mode on or off - default off
		_auth = true; // smtp authentication - default on

		_multipart = new MimeMultipart();

		// There is something wrong with MailCap, javamail can not find a
		// handler for the multipart/mixed part, so this bit needs to be added.
		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);
	}

	public MailSender(String user, String pass) {
		this();

		_user = user;
		_pass = pass;
	}

	public boolean send() throws Exception {
		Properties props = _setProperties();

		if (!_user.equals("") && !_pass.equals("") && _to.length > 0 && !_from.equals("") && !_subject.equals("")
				&& !_body.equals("")) {
			Session session = Session.getInstance(props, this);

			MimeMessage msg = new MimeMessage(session);

			msg.setFrom(new InternetAddress(_from));

			InternetAddress[] addressTo = new InternetAddress[_to.length];
			for (int i = 0; i < _to.length; i++) {
				addressTo[i] = new InternetAddress(_to[i]);
			}
			msg.setRecipients(MimeMessage.RecipientType.TO, addressTo);

			msg.setSubject(_subject);
			msg.setSentDate(new Date());

			// setup message body
			BodyPart messageBodyPart = new MimeBodyPart();
			messageBodyPart.setText(_body);
			_multipart.addBodyPart(messageBodyPart);

			// Put parts in message
			msg.setContent(_multipart);

			// send email
			Transport.send(msg);

			return true;
		} else {
			return false;
		}
	}

	public void addAttachment(String filename) throws Exception {
		BodyPart messageBodyPart = new MimeBodyPart();
		DataSource source = new FileDataSource(filename);
		messageBodyPart.setDataHandler(new DataHandler(source));
		messageBodyPart.setFileName(filename);

		_multipart.addBodyPart(messageBodyPart);
	}

	@Override
	public PasswordAuthentication getPasswordAuthentication() {
		return new PasswordAuthentication(_user, _pass);
	}

	private Properties _setProperties() {
		Properties props = new Properties();

		props.put("mail.smtp.host", _host);

		if (_debuggable) {
			props.put("mail.debug", "true");
		}

		if (_auth) {
			props.put("mail.smtp.auth", "true");
		}

		props.put("mail.smtp.port", _port);
		props.put("mail.smtp.socketFactory.port", _sport);
		props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
		props.put("mail.smtp.socketFactory.fallback", "false");

		return props;
	}

	// the getters and setters
	public String getBody() {
		return _body;
	}

	public void setBody(String _body) {
		this._body = _body;
	}

	public void setTo(String[] toArr) {
		_to = toArr;
	}

	public void setFrom(String fromString) {
		_from = fromString;

	}

	public void setSubject(String sub) {
		_subject = sub;
	}

}