//讀取回條
MailMessage msg = new MailMessage("send mail", email, subject, msgbody);
msg.Headers.Add("Disposition-Notification-To", "接收回條信箱");
//送達回條
msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;
SmtpClient MailClient = new SmtpClient();
MailClient.DeliveryMethod = SmtpDeliveryMethod.Network;
若對方的收信軟體有回覆回條的功能,並且對方同意回覆,
即可接收到已讀取的回條.
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