Checking the mail status after sending it ??

Question

Hi every body :-
I'm in my first steps in Java Mail and I need your helps.....
I'm using the following class to send mails to a certain reciepent ...It worked actually when the reciever mail address was correct (within my company domain)...but when I tried the following I failed can u please give ur suggestions ...
1)when I tried to send to wrong reciever in the correc domain, it gives no exception ....
2)when I want to send to external domain(@yahoo.com) it raises exception ==>550 5.7.1 Unable to relay for XXX
I want to be able to catch all of the exceptions ..but I don't know how ......
import java.io.*;
import java.util.*;
import javax.mail.*;
import javax.mail.event.*;
import javax.mail.internet.*;
public final class MailerBean {
     /* Bean Properties */
     private String to = "wrong_reciever@Correct_Domain";
     private String from = "test@Correct_Domain";
     private String subject = "My Mail Program";
     private String message = "Hi How are you..........";
     public static Properties props = null;
     public static Session session = null;
     static {
          /*     Setting Properties for STMP host */
          props = System.getProperties();
          props.put("mail.smtp.host", "mail server IP Address");
          session = Session.getDefaultInstance(props, null);
     /* Setter Methods */
     public void setTo(String to) {
          this.to = to;
     public void setFrom(String from) {
          this.from = from;
     public void setSubject(String subject) {
          this.subject = subject;
     public void setMessage(String message) {
          this.message = message;
     /* Sends Email */
     public void sendMail() throws Exception {
          if(!this.everythingIsSet())
               throw new Exception("Could not send email.");
          try {
               MimeMessage message = new MimeMessage(session);
               message.setRecipient(Message.RecipientType.TO,
                    new InternetAddress(this.to));
               message.setFrom(new InternetAddress(this.from));
               message.setSubject(this.subject);
               message.setText(this.message);
               Transport.send(message);
          } catch (MessagingException e) {
               throw new Exception(e.getMessage());
     /* Checks whether all properties have been set or not */
     private boolean everythingIsSet() {
          if((this.to == null) || (this.from == null) ||
          (this.subject == null) || (this.message == null))
               return false;
          if((this.to.indexOf("@") == -1) ||
               (this.to.indexOf(".") == -1))
               return false;
          if((this.from.indexOf("@") == -1) ||
               (this.from.indexOf(".") == -1))
               return false;
          return true;
     public static void main(String ss[])
          MailerBean mb = new MailerBean();
          try{ mb.sendMail();}
          catch(Exception ex1)
               System.out.println("Farah: Exception====> "+ex1.getMessage());
}

Answer 1

When you say "wrong receiver" do you mean an address that does not exist in the domain you sent the mail to?
If so, there is no way for you to check that when you send the mail, and you will not get an exception. It is possible that the domain's e-mail server may send a "bounce" message back to your server to tell you that the address does not exist there, but that happens later and there is no guarantee it will happen at all.