jmail发邮件问题

用以下jmail代码居然不能发邮件的，有没有高手来看看<head>
    <title></title>    <script type="text/javascript">        function sendMail() {
            var result = false;
            try {
                var objMail = new ActiveXObject("JMail.Message");
                if (!objMail) {
                    alert("客户端创建Jmail对象错误!");
                    return false;
                }                var subject = getValueById("id_Subject");
                var body = getValueById("id_Body");
                var mail = getValueById("id_Mail");                objMail.Logging = true;
                objMail.Charset = "GB2312";
                objMail.Priority = 3;
                objMail.ContentType = "text/html";                objMail.From = "发件邮箱地址";
                objMail.FromName = "Jmail Send";
                objMail.AddRecipient(mail);
                objMail.Subject = subject;
                objMail.Body = body;                objMail.MailServerUserName = "邮箱帐号";
                objMail.MailServerPassword = "邮箱密码";
                objMail.Send("smtp.163.com");                result = true;                alert("发送成功!");
            }
            catch (e) {
                alert(e.description);
                alert(objMail.Log);
            }            return result;
        }        function getValueById(id) {
            return document.getElementById(id).value;
        }    </script></head>
<body>
    <form id="form1" runat="server">
    <div>
        <ul>
            <li>收件邮箱：<input type="text" id="id_Mail" /></li>
            <li>邮件标题：<input type="text" id="id_Subject" /></li>
            <li>邮件内容：<input type="text" id="id_Body" /></li>
            <li>
                <input type="button" id="btnSub" value="Send" onclick="sendMail()" /></li>
        </ul>
    </div>
    </form>
</body>