Problems with javamail (Test source valid)

Hello!
I try to build a smart mailmanager with javamail. But I have run into som problems.

When I run it in a webserver (Orion) I can send to my own hotmail-adress but not to any other adresses. To other ardesses I get this Exception:
javax.mail.SendFailedException: Sending failed;
  nested exception is:
        javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
        javax.mail.SendFailedException: 501 Invalid address

        at javax.mail.Transport.send0(Transport.java:219)
        at javax.mail.Transport.send(Transport.java:81)
        at dsv.tools.MailManager.sendMail(MailManager.java:81)
        at dsv.servlets.Uppgift4aServlet.start(Uppgift4aServlet.java:34)
        at dsv.servlets.GeneralServlet.doGet(GeneralServlet.java:49)
        at dsv.servlets.GeneralServlet.doPost(GeneralServlet.java:30)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:211)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:309)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
        at com.evermind._efb._plc(.:518)
        at com.evermind._efb._adc(.:174)
        at com.evermind._cs._yqb(.:614)
        at com.evermind._cs._yrb(.:189)
        at com.evermind._bx.run(.:62)

When I run it as a standalone I can not send to any adresses at all. I get this exception all the time:

javax.mail.SendFailedException: Sending failed;
  nested exception is:
        javax.mail.MessagingException: IOException while sending message;
  nested exception is:
        javax.activation.UnsupportedDataTypeException: no object DCH for MIME ty
pe multipart/mixed; boundary="----=_Part_0_7640919.1077290888456"
        at javax.mail.Transport.send0(Transport.java:219)
        at javax.mail.Transport.send(Transport.java:81)
        at MailManager.sendMail(MailManager.java:81)
        at MailManager.main(MailManager.java:115)

I have no clue to solve either one of the problems but It would be great with some help.

Best regards
Fredrik

Below is the code to test this:

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.*;
import javax.activation.*;

public class MailManager
{
    public final static String TO = "TO";
    public final static String CC = "CC";
    public final static String BCC = "BCC";
    public final static String FROM = "FROM";
    public final static String SUBJECT = "SUBJECT";
    public final static String MESSAGE = "MESSAGE";
    public final static String HOST = "HOST";
    public final static String PROTOCOL = "PROTOCOL";
    public final static String USER = "USER";
    public final static String PORT = "PORT";
    public final static String PASSWORD = "PASSWORD";

    static Properties mailProperties;

    public MailManager()
    {
    }

    public static void setPropertis(Properties mp)
    {
        mailProperties = mp;
    }

    public static boolean isPropertiesSetForSend()
    {
        String[] propertyValues = new String[4];
        propertyValues[0] = mailProperties.getProperty("TO");
        propertyValues[1] = mailProperties.getProperty("FROM");
        propertyValues[2] = mailProperties.getProperty("HOST");
        propertyValues[3] = mailProperties.getProperty("PROTOCOL");
        for(int i = 0; i < propertyValues.length; i++)
        {
            if(propertyValues[i] == null || propertyValues[i].equals(""))
            {
                return false;
            }
        }
        if(propertyValues.length == 0)
        {
            return false;
        }
        return true;
    }

    public static void sendMail() throws Exception
    {
        if(isPropertiesSetForSend())
        {
            Date date = new Date();

            Properties props = new Properties();
            props.put("mail.smtp.host", mailProperties.getProperty(HOST));

            Session session = Session.getDefaultInstance(props, null);
            session.setDebug(false);

            Multipart multipart = new MimeMultipart();

            Message msg = new MimeMessage(session);
            msg.setContent(multipart);
            msg.setFrom(new InternetAddress(mailProperties.getProperty(FROM)));
            msg.setSubject( mailProperties.getProperty(SUBJECT) );
            msg.setSentDate(date);

            BodyPart bodyPartMain = new MimeBodyPart();
            bodyPartMain.setText( mailProperties.getProperty(MESSAGE) );
            multipart.addBodyPart(bodyPartMain);

            if(mailProperties.getProperty(TO) != null && !mailProperties.getProperty(TO).equals("") )
            {
                InternetAddress address = new InternetAddress(mailProperties.getProperty(TO));
                msg.setRecipient(Message.RecipientType.TO, address);
                Transport.send(msg);
            }
        }
    }

    public static void main(String[] args)
    {
        Properties mailProperties = new Properties();
        /*
        //Work props
        mailProperties.setProperty(MailManager.TO,             "xx.xxxx@xx-xxxx.se");
        mailProperties.setProperty(MailManager.CC,             "");
        mailProperties.setProperty(MailManager.BCC,         "");
        mailProperties.setProperty(MailManager.FROM,         "xx.xxxx@xx-xxxx.se");
        mailProperties.setProperty(MailManager.SUBJECT,     "Subject");
        mailProperties.setProperty(MailManager.MESSAGE,     "Hej!");
        mailProperties.setProperty(MailManager.HOST,         "mail.xx-xxxx.se");
        mailProperties.setProperty(MailManager.PROTOCOL,     "mail.smtp.host");
        */


        //Hotmailprops
        mailProperties.setProperty(MailManager.TO,             "xxxxx@hotmail.com");
        mailProperties.setProperty(MailManager.CC,             "");
        mailProperties.setProperty(MailManager.BCC,         "");
        mailProperties.setProperty(MailManager.FROM,         "xxxxx@hotmail.com");
        mailProperties.setProperty(MailManager.SUBJECT,     "Subject");
        mailProperties.setProperty(MailManager.MESSAGE,     "Hej!");
        mailProperties.setProperty(MailManager.HOST,         "mail.hotmail.com");
        mailProperties.setProperty(MailManager.PROTOCOL,     "mail.smtp.host");

        MailManager.setPropertis(mailProperties);
        if(MailManager.isPropertiesSetForSend())
        {
            try
            {
                MailManager.sendMail();
            }
            catch(Exception e)
            {
                e.printStackTrace();
            }
        }
    }
}