Emails sent by javamail not arriving

Question

Hi,
I have a webapp running on tomcat, which uses javamail. Tomcat is running on a hosting service. I have javamail pointing to smtp host = localhost. It sends email to gmail and hotmail successfully but it fails for yahoo. I check yahoo and see nothing from my server. I checked my server's inbox and there isn't a message rejected notification from yahoo. Does anyone know why email is successfully getting to other email services like gmail and hotmail but not yahoo.
A snippet of the code sending the email is at the end of this message.
Thanks for your help in advance.
-Anthony
private static final String SMTP_HOST_NAME = "localhost";
     private static final String SMTP_PORT = "25"; // 465
     private static Properties props = new Properties();
     static {
          props.put("mail.smtp.host", SMTP_HOST_NAME);
          props.put("mail.smtp.port", SMTP_PORT);
          props.put("mail.debug", "true");
     public static Message generateMessage(HttpServletRequest request,
               String recipients[], String[] ccs, String[] bccs, String from,
               String subject, String message, String pathToAttachmentFile) throws MessagingException {
          if (recipients == null || recipients.length < 1)
               return null;
          Session session = Session.getDefaultInstance(props);
          session.setDebug(true);
          // contruct Message
          Message msg = new MimeMessage(session);
          InternetAddress addressFrom = new InternetAddress(from);
          msg.setFrom(addressFrom);
          // set receipient email addresses
          InternetAddress[] addressTo = new InternetAddress[recipients.length];
          for (int i = 0; i < recipients.length; i++) {
               addressTo[i] = new InternetAddress(recipients);
          msg.setRecipients(Message.RecipientType.TO, addressTo);

Answer 1

Most likely the spam filter at Yahoo is trapping your message.
Once the message gets to your local mail server, it's out of JavaMail's hands.
You might want to check the logs in your mail server to see if the message is
actually getting sent to Yahoo, or if there's problems at that level.