using System.Net.Mail;//郵件發送需引用 
public ActionResult bindStep3(ModelCompany c)
    {
      .........
      ..........
      ...........
      MailAddress MessageFrom = new MailAddress("xxxxx@qq.com"); //發件人郵箱地址 
      string MessageTo = company.COMPANY_EMAIL; //收件人郵箱地址 
      string MessageSubject = "激活驗證"; //郵件主題 
      string MessageBody = "請進行郵箱驗證來完成您注冊的最后一步,點擊下面的鏈接激活您的帳號：br>a target='_blank' rel='nofollow' style='color: #0041D3; text-decoration: underline' href=''>激活/a>"; //郵件內容 （一般是一個網址鏈接，生成隨機數加驗證id參數，點擊去網站驗證。）
 
    if (SendMail(MessageFrom, MessageTo, MessageSubject, MessageBody))
    {
      Response.Write("script type='text/javascript'>alert('發送郵件失敗');/script>");
    }
    else
    {
      Response.Write("script type='text/javascript'>alert('發送郵件失敗');/script>");
    }
      TempData["CompanyBind3"] = company;
      return View("bindStep3");
    }

    public bool SendMail(MailAddress MessageFrom,string MessageTo,string MessageSubject,string MessageBody)  //發送驗證郵件
    {
      MailMessage message = new MailMessage();
      message.To.Add(MessageTo);
      message.From = MessageFrom;
      message.Subject = MessageSubject;
      message.SubjectEncoding = System.Text.Encoding.UTF8;
      message.Body = MessageBody;
      message.BodyEncoding = System.Text.Encoding.UTF8;
      message.IsBodyHtml = true; //是否為html格式 
      message.Priority = MailPriority.High; //發送郵件的優先等級 
      SmtpClient sc = new SmtpClient();
      sc.EnableSsl = true;//是否SSL加密
      sc.Host = "smtp.qq.com"; //指定發送郵件的服務器地址或IP 
      sc.Port = 587; //指定發送郵件端口 
      sc.Credentials = new System.Net.NetworkCredential("xxxxx@qq.com", "xxxxx"); //指定登錄服務器的用戶名和密碼(注意：這里的密碼是開通上面的pop3/smtp服務提供給你的授權密碼，不是你的qq密碼)

      try
      {
        sc.Send(message); //發送郵件 
      }
      catch(Exception e)
      {
        Response.Write(e.Message);
        return false;
      }
      return true;
      
    }