Please help!! Problem with my javamail client for gmail and yahoo

Thanks guys!! this was really prompt! but i have already tried doing this. This is what the javamail client looks like:

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.mail.*;
import javax.mail.event.*;
import javax.mail.internet.*;

public class MailClient extends Frame {


String mailHost = "smtp.monash.edu.au";
Label toLabel = new Label("To:");
Label fromLabel = new Label("From:");
Label subjectLabel = new Label("Subject:");
Label contentLabel = new Label("Content:");
Label statusLabel = new Label("Status:");
TextField destination = new TextField();
TextField source = new TextField();
TextField subject = new TextField();
TextArea content = new TextArea();
Button send = new Button("Send Message");
TextArea status = new TextArea();

public static void main(String args[]){
MailClient app = new MailClient();
}

public MailClient() {
super("MailClient");
setup();
addWindowListener(new WindowEventHandler());
setSize(550,450);
show();
}

void setup() {
setupMenuBar();
layoutComponents();
send.addActionListener(new ButtonHandler());
}

void setupMenuBar() {
MenuBar menuBar = new MenuBar();
Menu fileMenu = new Menu("File");
MenuItem fileExit = new MenuItem("Exit");
fileExit.addActionListener(new MenuItemHandler());
fileMenu.add(fileExit);
menuBar.add(fileMenu);
setMenuBar(menuBar);
}

void layoutComponents() {
int x = 10;
int y = 50;
// Set bounds
toLabel.setBounds(x,y,50,25);
destination.setBounds(x+70,y,300,25);
fromLabel.setBounds(x,y+40,50,25);
source.setBounds(x+70,y+40,300,25);
subjectLabel.setBounds(x,y+80,50,25);
subject.setBounds(x+70,y+80,300,25);
contentLabel.setBounds(x,y+120,50,25);
content.setBounds(x+70,y+120,300,100);
statusLabel.setBounds(x,y+240,50,25);
status.setBounds(x+70,y+240,300,100);
send.setBounds(400,y,100,30);
// Add components
add(toLabel);
add(destination);
add(send);
add(fromLabel);
add(source);
add(subjectLabel);
add(subject);
add(contentLabel);
add(content);
add(statusLabel);
add(status);
add(new Label(""));
}

void sendMessage() {
Properties properties = new Properties();

properties.put("mail.smtp.user", "***@infotech.monash.edu.au");
properties.put("mail.smtp.password", "*******");
properties.put("mail.smtp.host",mailHost);
properties.put("mail.smtp.port", "465");
properties.put("mail.smtp.startssl.enable","true");
properties.put("mail.smtp.starttls.enable","true");
properties.put( "mail.smtp.auth", "true");
properties.put("mail.smtp.debug", "true");
properties.put("mail.from",source.getText());

try {

   Authenticator auth = new SMTPAuthenticator();
   Session session = Session.getInstance(properties, auth);
   session.setDebug(true);
   Message message = new MimeMessage(session);
   InternetAddress[] address =
    {new InternetAddress(destination.getText())};
   message.setRecipients(Message.RecipientType.TO, address);
   message.setFrom(new InternetAddress(source.getText()));
   message.setSubject(subject.getText());
   message.setContent(content.getText(),"text/plain");
   Transport transport = session.getTransport(address[0]);
   transport.addConnectionListener(new ConnectionHandler());
   transport.addTransportListener(new TransportHandler());
   transport.connect();
   message.saveChanges();
   transport.sendMessage(message,address);
}catch(Exception e){
   status.setText(e.toString());
}
}

private class SMTPAuthenticator extends javax.mail.Authenticator {

public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication ("***@infotech.monash.edu.au", "*******");
}
}

class ConnectionHandler extends ConnectionAdapter {
public void opened(ConnectionEvent e) {
   status.setText("Connection opened.");
}
public void disconnected(ConnectionEvent e) {
   status.setText("Connection disconnected.");
}
public void closed(ConnectionEvent e) {
   status.setText("Connection closed.");
}
}

class TransportHandler extends TransportAdapter {
public void messageDelivered(TransportEvent e) {
   status.setText("Message delivered.");
}
public void messageNotDelivered(TransportEvent e) {
   status.setText("Message NOT delivered.");
}
public void messagePartiallyDelivered(TransportEvent e) {
   status.setText("Message partially delivered.");
}
}

class ButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent ev){
   String s=ev.getActionCommand();
   if(s.equals("Send Message")) sendMessage();
}
}

class MenuItemHandler implements ActionListener {
public void actionPerformed(ActionEvent ev){
   String s=ev.getActionCommand();
   if(s=="Exit"){
    System.exit(0);
   }
}
}

class WindowEventHandler extends WindowAdapter {
public void windowClosing(WindowEvent e){
   System.exit(0);
}
}

}

This code works fine with my monash smtp mail server but with gmail and yahoo it gives a timeout error or sometimes a network unreachable error!! The mail client is part of the application I am tryin to develop. I am also now realizing that is this because I am using a VPN connection for Internet and the proxy is not allowing me to connect to the server?? If so how do I go around this problem?

[Moderator edit (MF): removed email address]

Incoming Mail (POP3) Server - requires SSL:	pop.gmail.com Use SSL: Yes Port: 995
Outgoing Mail (SMTP) Server - requires TLS:	smtp.gmail.com (use authentication) Use Authentication: Yes Use STARTTLS: Yes (some clients call this SSL) Port: 465 or 587
Account Name:	your Gmail username (including '@gmail.com')
Email Address:	your full Gmail email address (username@gmail.com)
Password:	your Gmail password

saguna

freitasm

bradstewart

saguna

freitasm

xand

saguna