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我这里有一堆关于 SMTPClient 发送邮件的代码：

  public void SendEmailToCustomer(ReservationDetails reservationDetails, string reason, string cardtype) {

    MailMessage msg = new MailMessage(ConfigurationManager.AppSettings["Email.Sender"], reservationDetails.Email);

    msg.Subject = this.Subject;
    msg.Body = this.Body.Replace("[InvoiceNumber]", reservationDetails.Invoice)
      .Replace("[GuestName]", reservationDetails.Name)
      .Replace("[GuestTelephone]", reservationDetails.Telephone)
      .Replace("[GuestEmail]", reservationDetails.Email)
      .Replace("[GuestAddress]", reservationDetails.Address)
      .Replace("[GuestCompany]", reservationDetails.CompanyName)
      .Replace("[GuestCompanyAddress]", reservationDetails.CompanyAddress)
      .Replace("[GuestCompanyNumber]", reservationDetails.CompanyNumber)
      .Replace("[OtherRemarks]", reservationDetails.Other)
      .Replace("[TransferDescription]", reservationDetails.TransferDescription)
      .Replace("[FlightArrivalDate]", reservationDetails.ArrivalDate)
      .Replace("[ETA]", reservationDetails.ETA)
      .Replace("[FlightArrival]", reservationDetails.FlightArrival)
      .Replace("[FlightDepartureDate]", reservationDetails.DepartureDate)
      .Replace("[ETD]", reservationDetails.ETD)
      .Replace("[FlightDeparture]", reservationDetails.FlightDeparture)
      .Replace("[NoOfNights]", reservationDetails.NoOfNights)
      .Replace("[CheckIn]", reservationDetails.CheckIn)
      .Replace("[CheckOut]", reservationDetails.CheckOut)
      .Replace("[RoomName]", reservationDetails.RoomName)
      .Replace("[Qty]", reservationDetails.Qty)
      .Replace("[RoomAmount]", String.Format("{0:N}", Convert.ToDecimal(reservationDetails.RoomAmount)))
      .Replace("[RateRoom]", String.Format("{0:N}", Convert.ToDecimal(reservationDetails.RateRoom)))
      .Replace("[NumExtra]", Convert.ToString(reservationDetails.NumExtra))
      .Replace("[ExtraAmount]", String.Format("{0:N}", Convert.ToDecimal(reservationDetails.ExtraAmount)))
      .Replace("[RateExtra]", String.Format("{0:N}", Convert.ToDecimal(reservationDetails.RateExtra)))
      .Replace("[RTTQty]", Convert.ToString(reservationDetails.RTTQty))
      .Replace("[RTT]", String.Format("{0:N}", Convert.ToDecimal(reservationDetails.RTT)))
      .Replace("[RTTAmount]", String.Format("{0:N}", Convert.ToDecimal(reservationDetails.RTTAmount)))
      .Replace("[TotalAmount]", String.Format("{0:N}", Convert.ToDecimal(reservationDetails.TotalAmount)))
      .Replace("[ModePay]", reservationDetails.ModePayment)
      .Replace("[Reason]", "Reason: " + reason)
      .Replace("[CardType]", cardtype)
                 ;

    msg.CC.Add(this.AddressCC);
    msg.Bcc.Add(this.AddressBCC);
    msg.IsBodyHtml = true;

    try {
      SmtpClient client = new SmtpClient(ConfigurationManager.AppSettings["Smtp.Client"]);
      client.Credentials = new System.Net.NetworkCredential(ConfigurationManager.AppSettings["Smtp.Credentials.Username"], ConfigurationManager.AppSettings["Smtp.Credentials.Password"]);
      client.Send(msg);


    } catch (Exception ex) {
      //Do nothing
      //throw new Exception("Couldn't send email: <p>" + ex.Message);
    } finally {
      msg.Dispose();
    }

  }

发送电子邮件的时间过长（大约 5 秒）。我还处理了 MailMessage。

电子邮件延迟的可能原因是什么。我该如何解决这个问题？

非常感谢！！:D

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