مشكلة في ارسال الرسائل

سلام عليكم...

انا كتبت هذا الكود ولكن...

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

public class email{ 

private static void send(String host, String from, String to, String subject, String time){ 


//setup the contents of the e-mail message 
String contents = ("Email content"); 

//set the properties 
Properties prop = System.getProperties(); 

//set up the mail server 
prop.put("mail.smtp.host", host); 

//create a new session 
Session session = Session.getDefaultInstance(prop, null); 


try { 
//define the message 
MimeMessage message = new MimeMessage(session); 

//set who the message is from 
message.setFrom(new InternetAddress("Timetables@ulst.ac.uk")); 

//set who the message is to 
message.addRecipient(Message.RecipientType.TO, new InternetAddress(to)); 

//set the message subject 
message.setSubject("Details of Meeting " + subject); 

//set the message content 
message.setContent(contents + "footer", "text/plain"); 

//send the message 
Transport.send(message); 


//exception handling 
} catch (MessagingException mex) { 
System.out.println("n--Exception handling in sending email"); 

mex.printStackTrace(); 
System.out.println(); 
Exception ex = mex; 
do { 
if (ex instanceof SendFailedException) { 
SendFailedException sfex = (SendFailedException)ex; 
Address[] invalid = sfex.getInvalidAddresses(); 
if (invalid != null) { 
System.out.println(" ** Invalid Address"); 
if (invalid != null) { 
for (int i = 0; i < invalid.length; i++) 
System.out.println(" " + invalid); 
} 
} 
Address[] validUnsent = sfex.getValidUnsentAddresses(); 
if (validUnsent != null) { 
System.out.println(" ** ValidUnsent Address"); 
if (validUnsent != null) { 
for (int i = 0; i < validUnsent.length; i++) 
System.out.println(" "+validUnsent); 
} 
} 
Address[] validSent = sfex.getValidSentAddresses(); 
if (validSent != null) { 
System.out.println(" ** ValidSent Address"); 
if (validSent != null) { 
for (int i = 0; i < validSent.length; i++) 
System.out.println(" "+validSent); 
} 
} 
} 
System.out.println(); 
if (ex instanceof MessagingException) 
ex = ((MessagingException)ex).getNextException(); 
else 
ex = null; 
} while (ex != null); 
}//end of catch 
}//end of send email 

public static void main(String [] args){ 

send("213.230.9.11", "memonono@yahoo.com", "memonono@mailcity.com", "Conformation from wael", "Whenever");} 

}

وهذه رسالة الخطاء الذي يظهر

طبعا run-time error

والبرنامج successfully compiled

n--Exception handling in sending email
javax.mail.SendFailedException: Sending failed;
  nested exception is:
        class javax.mail.MessagingException: Could not connect to SMTP host: 213
.230.9.11, port: 25;
  nested exception is:
        java.net.ConnectException: Connection refused: connect
        at javax.mail.Transport.send0(Transport.java:218)
        at javax.mail.Transport.send(Transport.java:80)
        at email.send(email.java:43)
        at email.main(email.java:92)

طبعا بدلا من213.230.9.11

جربت smtp.yahoo.com

ولكن لا فائدة

هل للبروكسي تأثير ؟؟؟