Enviando Email... Problemas x.x

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

Esse eh meu codigo (a parte comentada acho q eu costumava nao usar)
public class Email3 {
	
	public static void main(String args[]){
	
	Properties prop = new Properties();
	prop.put ("mail.smtp.host", "localhost");   
	prop.put ("mail.smtp.auth", "true");  
	prop.put ("mail.smtp.host", "localhost"); 
	prop.put ("mail.smtp.auth", "true"); 
	prop.put ("mail.debug", "true"); 
	prop.put ("mail.smtp.debug", "true"); 
	prop.put ("mail.mime.charset", "ISO-8859-1"); 
	//prop.put ("mail.smtp.port", "25"); 
	//prop.put ("mail.smtp.starttls.enable", "true"); 
	//prop.put ("mail.smtp.socketFactory.port", "25"); 
	//prop.put ("mail.smtp.socketFactory.fallback", "false"); 
	//prop.put ("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 

    Session session = Session.getInstance(prop,new Authenticator() {   
        protected PasswordAuthentication getPasswordAuthentication() {   
        return new PasswordAuthentication("emailenviando", "senha");   
        }   
    });   
    
    
    MimeMessage msg = new MimeMessage(session);   
    try {   
        msg.setFrom(new InternetAddress("emailenviando"));   
        msg.setRecipient(javax.mail.Message.RecipientType.TO,new InternetAddress("emailrecebe"));   
        msg.setSentDate(new Date());             
        msg.setSubject("fdsf");   
        msg.setText("fsdf");
        Transport.send(msg);   
        System.out.println("Email enviado");  
        
	    } catch (AddressException e) {   
	        System.out.println("Email nao enviado");   
	        e.printStackTrace();   
	    } catch (MessagingException e) {   
	        System.out.println("Email nao enviado");   
	        e.printStackTrace();   
	    }   
	}    
}