Authentication faild when sending email to yahoo mail

Question

I can not send email to yahoo mail address. The error message is:
javax.mail.MessagingException: 530 authentication required - for help go to http://help.yahoo.com/help/us/mail/pop/pop-11.html
I tried different ways to do the authentication:
1. Create a passwordAuthenticator (extends Authenticator) and set my yahoo userName and yahoo password there.
then use this authenticator to get session:
Session session = Session.getDefaultInstance(props, auth);
I also tried both props.put("mail.smtp.auth",new Boolean(true));
and props.put("mail.smtp.auth",new Boolean(false));
2. using
session.setPasswordAuthentication(new URLName("smtp.mail.yahoo.com"), new
PasswordAuthentication(myYahooUserId, myYahooPasswoed);
3. using Transport instance:
Transport transport = session.getTransport("smtp");
transport.connect(host, myYahooUserName, myYahooPasswoed);
msg.saveChanges();
transport.send(msg);
transport.close();
None of the above approaches are working.
Can any one hlep?
Thanks

Answer 1

I am looking at the last line in step 1 in the code,
and am wondering why the auth is set to false? I am
new to this area, so just curious, not trying to
provide an answer :-)I just tried with Rogers SMTP server, it is OK .. here is my code
Properties props = System.getProperties();
               //Authenticator auth = new
               // -- Attaching to default Session, or we could start a new one --
               props.setProperty("mail.transport.protocol", "smtp");
               props.setProperty("mail.host", smtpServer);
               props.setProperty("mail.user", acctName);
               props.setProperty("mail.password", password);
               props.setProperty("mail.smtp.auth","true");
               Session mailSession = Session.getDefaultInstance(props, null);
               Transport transport = mailSession.getTransport();
               MimeMessage message = new MimeMessage(mailSession);
               message.setContent(subject, "text/plain");
               message.addRecipient(Message.RecipientType.TO,
                    new InternetAddress(to));
               Address replyList[] = { new InternetAddress(from) };
               message.setReplyTo(replyList);
               message.setFrom(new InternetAddress(from));
               //transport.connect();
               transport.connect(smtpServer, acctName, password);
               transport.sendMessage(message,
                    message.getRecipients(Message.RecipientType.TO));
               transport.close();