title: Sending mail with delivery receipt?
body: <p>I use a function that sends emails to some users.</p>
  
  <p>I use the following code to send delivery notification failure messages to the sender email</p>
  
  <p>when a message fails to reach the user.</p>
  
  <p>I use the following code.</p>
  
  <pre><code>System.Web.Mail.MailMessage messagetest = new System.Web.Mail.MailMessage();
  messagetest.Headers.Add("Disposition-Notification-To", txtFrom.Text);
  </code></pre>
  
  <p>now I want to enable the sender to receive a Delivered receipt message when the mail arrives successfully.</p>
  
  <p>how can this be done ?</p>
  
  <p>thanks</p>