本地测试jmail没问题,放服务器就有问题了

在服务器上提示错误The message was undeliverable. All servers failed to receive the message
但本地测试是没有问题的.搞了我一个上午,好纠结啊

我的代码

    public void sendmail(string str)

    {

        jmail.MessageClass Jmail = new jmail.MessageClass();

        Jmail.Silent = false;

        Jmail.Logging = true;

        Jmail.Charset = "UTF-8";

        Jmail.AddRecipient("book@okhotel.com", "", "");

        Jmail.From = "book@okhotel.com";

        Jmail.MailServerPassWord = "";

        Jmail.Subject = "";

        Jmail.Body = "";

        Jmail.Send("mail.okhotelcn.com", false);

        Jmail.Close();

    }

同时,用同事给我的asp代码测试没有问题

<%



Call Jmail(Uname,uemail,mailsubject,mess)





Sub Jmail(Uname,Email,Topic,Mailbody)

	On Error Resume Next

	Dim JMail

	Set JMail = Server.CreateObject("JMail.Message")

	JMail.silent=true

	JMail.Logging = True

	JMail.Charset = "utf-8"

	

	JMail.MailServerUserName = "book@okhotel.com" 

	JMail.MailServerPassword = "" '密码

	

	JMail.ContentType = "text/html"       

	JMail.Priority = 1

		   JMail.From = "book@okhotel.com"      '邮件服务器       

		   JMail.FromName = "发件人姓名"     '

	JMail.AddRecipient "book@okhotelcn.com"        '收件人邮箱

	JMail.Subject = "邮件主题"              '

	JMail.Body = "邮件正文"              '

	JMail.Send ("mail.okhotel.com")        'smtp服务器地址

	Set JMail = Nothing

	SendMail = "OK"

	Response.Write "<font color=red size=5><B>发送成功</B></font>"

End Sub

%>