JavaMail

Question

I have written a program which sends a simple e-mail conformation, it compiles with no errors and runs no problem, well it looks like it does, the only problam is , no email comes through.
i have attached the source code, would anyone be able to help?
thanks in advance
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("[email protected]"));
          //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[i]);
          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[i]);
          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("iserve1.infj.ulst.ac.uk", "[email protected]", "[email protected]", "Conformation", "Whenever");}

Answer 1

It doesn't work because of the 'relay request'. Most smtp servers will reject a request for relay because of the problems of spamming and somewhat ironically, many email spoofers will hack into university servers as they have a less stringent security management than commercial ISP/servers ... hmmm.
I assume that you have set up an email server at the college, contact the administrator there and ask him/her to register your password and user name with the smtp server.
- Also you may need a 'Helo' message before you send the request.
- You can also check the javamail forum here at this site.
Hope that helps.