java mail

[jonathan Greens]

I am using the following code to send mail through smtp. The host is valid, the authentication went through, it seems that the mail was sent. But I can't receive it. On a couple of times I can receive the mail but this is an reoccuring problem. Any idea?
thanks

   Properties props = System.getProperties();
 
    // Setup mail server
     props.put("mail.smtp.host", host);
 

    // Get session
     
    Authenticator a=new Authenticator(){
    /* (non-Javadoc)
 * @see javax.mail.Authenticator#getPasswordAuthentication()
 */
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(from,AUTH_PWD);
}
    };
    Session session = Session.getInstance(props,a);
Properties ps=session.getProperties();
 


    // Define message
    MimeMessage message = new MimeMessage(session);
    InternetAddress fromAddr=new InternetAddress(from);
    InternetAddress toAddr=new InternetAddress(to);
    message.setFrom(fromAddr);
    message.addRecipient(Message.RecipientType.TO, 
     toAddr);
    message.setSubject(subject);
    message.setText(body);
System.err.println("from: "+fromAddr+" to : "+toAddr);
    // Send message
    Transport.send(message);