title: System.Net.Mail reference does not exist
body: <p>I have a problem creating application to send email. </p>
  
  <p>I already have one working as a Windows Forms Application and then decided to do the same from the empty project, because I need to make a background application now. </p>
  
  <p>I used the <code>System.Net.Mail</code> namespace for that in a Windows Forms. Then added the same code to the new project.  </p>
  
  <p>However, I get the following error: </p>
  
  <blockquote>
    <p>The type or namespace name 'Mail' does not exist in the namespace
    'System.Net'.</p>
  </blockquote>
  
  <p>The 'System.Net' reference is included in the project references list and I can't find anything named 'System.Net.Mail' in the list of possible references. The point is that I didn't have those errors in Windows Forms app. </p>