无法通过javamail通过POP3协议获取yahoo邮件

我有一些代码如下：

Properties props = System.getProperties();

        //set mail protocol 
        //props.setProperty("mail.store.protocol", "imaps");
        props.setProperty("mail.store.protocol", "pop3s");

        //create new store 
        Session session = Session.getDefaultInstance(props);

        //store = session.getStore("imaps");
        store = session.getStore("pop3s");


        store.connect("pop.mail.yahoo.com", 995, "MyYahooUserName", "MyPassword");
        //store.connect("imap.next.mail.yahoo.com", 993, "MyYahooUserName", "MyPassword");
        isConnect = true;

当我尝试IMAP协议时，这是可行的，但对于POP3，我在下面遇到了异常，我不知道为什么

SEVERE: null
javax.mail.AuthenticationFailedException: EOF on socket
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:208)
at javax.mail.Service.connect(Service.java:295)
at gmailutilities.GmailUtilities.connect(GmailUtilities.java:88)
at gmailutilities.Main.main(Main.java:29)
javax.mail.MessagingException: Not connected
at com.sun.mail.pop3.POP3Store.checkConnected(POP3Store.java:408)
at com.sun.mail.pop3.POP3Store.getDefaultFolder(POP3Store.java:357)
at gmailutilities.GmailUtilities.openFolder(GmailUtilities.java:103)
at gmailutilities.Main.main(Main.java:30)

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*有人知道为什么吗？请帮帮我。谢谢大家*

请注意，免费的雅虎！邮件帐户不允许POP3或SMTP访问。你必须购买雅虎！获得POP3和SMTP访问权限的Mail Plus帐户

请阅读以下条目：-您没有包含足够的代码来显示错误发生的位置，但可能与此相关。