Having troubles sending mails

I have a code which sends mails getting the addresses from a file. So long I havae just been able to send mails to addresses which end with @mail.mty.itesm.mx , if i put any other address, a nested exceptions is thrown which for every address of any other type. I will aprecciate a lot some help.
Here is the code:
class MailBomber extends Thread{
 protected String host,de,texto,filePath;
 protected Session sesion;
 protected InternetAddress[] respuesta;
 protected Properties prp;
 public MailBomber() throws AddressException{
 host="mail.mty.itesm.mx";
 de="[email protected]";
 filePath=null;
 respuesta= new InternetAddress[1];
 respuesta[0]=new InternetAddress("[email protected]");
 prp=System.getProperties();
 prp.put("mail.smtp.host",host);
 sesion=Session.getDefaultInstance(prp,null);
 texto="<html><body><center> Acabe con todos sus problemas computacionales! </center>En Dolph S.A. nosotros le ofrecemos la atenci�n de personal capacitado en mantenimiento y reparaci�n de computadoras listo para solucionar cualquier problema que Ud pueda tener. Satisfacci�n grantizada. Servicio a domicilio en Monterrey y su area metropolitana. Pregunte por nuestras ofertas. Ofrecemos descuento mencionando este anuncio.* Cont�ctenos al 81-00-94-20 * Promoci�n no acumulable. V�lido s�lo en servicios participantes.</body></html>";
 public MailBomber(String filePath) throws AddressException{
 this();
 this.filePath=filePath;
 public void run(){
 try{
 if(filePath==null){
 mandaElMail("[email protected]");
 sleep(50);
 }else{
 BufferedReader reader= new BufferedReader(new FileReader(filePath));
 String line;
 int counter=0;
 while((line=reader.readLine())!=null){
 System.out.println("vamos en el numero "+(++counter)+" enviado a "+line);
 mandaElMail(line);
 sleep(80);
 System.out.println("Ya acab�");
 }catch(Exception ex){
 System.out.println(ex.toString());
 public void mandaElMail(String para){
 try{
 MimeMessage mensaje=new MimeMessage(sesion);
 mensaje.setContent(texto,"text/html");
 mensaje.setSubject("Reparaci�n de Computadoras en Monterrey");
 mensaje.setFrom(new InternetAddress("[email protected]","Dolph Computaci�n"));
 mensaje.setReplyTo(respuesta);
 mensaje.addRecipients(MimeMessage.RecipientType.TO,para);
 Transport.send(mensaje);
 }catch(Throwable ex){
 System.out.println(ex.toString()+" en mandarElMails");
thanks a lot for any help

That message said the server could not relay, right? That is one of the JavaMail FAQs. Ask the administrator of your mail server (mail.mty.itesm.mx) about it.

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