title: How to send mass email to my users and get a response from the mail server
body: <p>I'm sending emails to about 10,000 of our registered users.  In the past we have had issues of not all of the emails being sent out.  I spoke to the mail server admin and he suggested I get a distinct code that is generated by the mail server to track each email sent.  </p>
  
  <p>I get my list of users from our oracle db and then loop through one at a time and do a <code>SmtpClient.Send()</code>. With <code>SmtpClient.Send()</code> I'm not sure how to get the mail server response back.  Is this possible with <code>Send()</code> or should I use one of the other <code>SmtpClient</code> methods of sending email that will return a response?</p>