Do I need to install a SMTP server before using javamail?
I have done the following program and i m using jboss as my server.

try{

//set up the default parameters.

Properties props = new Properties();

props.put("mail.transport.protocol", "smtp");

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

props.put("mail.smtp.port", "25");


//create the session and create the new mail message

Session mailSession = Session.getInstance(props);

Message msg = new MimeMessage(mailSession);


//set the FROM, TO, DATE and SUBJECT fields

msg.setFrom(new InternetAddress("me@hiron.com"));

msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse("htamuly@yahoo.com"));

msg.setSentDate(new Date());

msg.setSubject("Testing my send mail method");


//create the body of the mail

msg.setText("Hello! from my first java e-mail...Testing!!");


//ask the Transport class to send our mail message

Transport.send(msg);

System.out.println("E-mail successfully sent!!");


}catch(Exception e){

e.printStackTrace();

}

I am getting the following exception----

javax.mail.MessagingException: Unknown SMTP host: localhost, and i have given the port number 25.