About pop3

I use these program to get the email from my email server:

Properties props = System.getProperties();

Session session=Session.getDefaultInstance(props,null);

Store store = session.getStore("pop3");

store.connect(email_host,username,password);

Folder folder = store.getFolder("INBOX");

folder.open(Folder.READ_ONLY);

Message message[] = folder.getMessages();

It can login successfully. But the length of the array message is always zero. I am sure there are many mails in my email box. Why can't I get any of them?

Thanks

[666 byte] By [youhaodiyia] at [2007-11-27 9:52:33]