VS.NET发送普通邮件原码

public static void SendMail(string toEmail,string bodyEmail,string subjectEmail)
        {
            try
            {
                MailMessage mm = new MailMessage();
                    mm.From = new MailAddress("MESSYSTEM@AMATECH.CN","MES系統");
                //MailAddress mafrom = new MailAddress("MESSYSTEM@AMATECH.CN", "MES系統");
                //mm.From = mafrom;
                mm.To.Add(toEmail);
                mm.Body = bodyEmail;
                mm.Subject = subjectEmail;
                mm.Priority = MailPriority.High;
                SmtpClient sc = new SmtpClient();
                sc.Host = "172.22.236.5";
                string userid = "";
                string pswd = "";
                string domain = "";
                userid = "pega\roy_gu";
                pswd = "@xiaoli123"
                domain = "mail.sz.honyun.cn"

                sc.Credentials = new System.Net.NetworkCredential(userid, pswd, domain);
                sc.DeliveryMethod = SmtpDeliveryMethod.Network;
                sc.Send(mm);
            }
            catch
            {
                MessageBox.Show("郵件未能成功能發送，\r\n請與管理員聯繫！", "MES系統", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            }
        }