jmail发邮件失败

<html>



<head>



    <title>mail</title>



    <script>



    function SendEMail(subject,infor)



    {



        var jMail = new ActiveXObject("Jmail.message");



        jMail.Silent = true;

		

		jMail.ISOEncodeHeaders = false;



        jMail.Charset = "gb2312";



        jMail.FromName = "from name";



        jMail.From = "guoyu_bo@21cn.com";



        jMail.AddRecipient("guoyu_bo@21cn.com");



        jMail.Subject = subject;



        jMail.Body = infor;



        jMail.MailServerUserName="guoyu_bo";



        jMail.MailServerPassWord="13579a";



        var ret = jMail.Send("smtp.21cn.com");



        if(ret == false)

        {



            alert("fail");



        }

        else

        {



            alert("success");



        }

        jMail.Close();

    }

SendEMail('title','body');

        </script>



</head>

</html>