Jmail组件密送邮件失败

我使用的是JMail44_pro个人破解版组件。在.net环境下开发B/S系统。在使用jmail发邮件时密送邮件总是发送不成功，而抄送和正常发送都没有问题，也没有报错。怎么会这样？

        private void send(string Email_Title,

                          string Email_Content,

                          string Email_ReceiveUser,

                          string Email_CopyUser,

                          string Email_SecretUser)

        {

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

            myJmail.Charset = "GB2312";

            myJmail.ISOEncodeHeaders = false;

            myJmail.From = "10_wangchao21@163.com";

            myJmail.MailServerUserName = "10_wangchao21";

            myJmail.MailServerPassWord = "******";//密码暂时用*号代替

            myJmail.Subject = Email_Title;



            string[] Receivers = Email_ReceiveUser.Split(',');

            for (int i = 0; i < Receivers.Length; i++)

            {

                myJmail.AddRecipient(Receivers[i],"","");

            }



            string[] CopyUsers = Email_CopyUser.Split(',');

            for (int k = 0; k < CopyUsers.Length; k++)

            {

                myJmail.AddRecipientCC(CopyUsers[k],"","");

            }



            string[] SecretUsers = Email_SecretUser.Split(',');

            for (int x = 0; x < SecretUsers.Length; x++)

            {

                myJmail.AddRecipientBCC(SecretUsers[x],"");

            }



            myJmail.Body = Email_Content;

            myJmail.Send("smtp.163.com", false);

        }

.net jmail email --------------------编程问答-------------------- 自己顶

--------------------编程问答-------------------- 没人理

补充：.NET技术 ,  ASP.NET