title: Send html email message and plainText as alternative
body: <pre><code>    using (MailMessage message = new MailMessage()) // using System.Net.Mail;
      {
        string mailFrom = "sender@email.si";
        string smtpServer = "smtp.server.net";
  
        message.From = new MailAddress(mailFrom);
        message.To.Add("xxx@gmail.com");
        message.Subject = "subject";
        message.SubjectEncoding = Encoding.UTF8;
  
        message.IsBodyHtml = true;
        message.Body = "&lt;h1&gt;VODA&lt;/h1&gt;";
        message.BodyEncoding = Encoding.UTF8;
  
        AlternateView plainView = AlternateView.CreateAlternateViewFromString("test content", Encoding.UTF8, "text/plain");
        message.AlternateViews.Add(plainView);
  
        SmtpClient smtpClient = new SmtpClient(smtpServer);
  
        smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
        smtpClient.UseDefaultCredentials = false;
        smtpClient.Credentials = new System.Net.NetworkCredential("user", "pass");
        smtpClient.EnableSsl = true;
        smtpClient.Port = 587;
        smtpClient.Send(message);
      }
  </code></pre>
  
  <p>When looking what was received at gmail I see next:</p>
  
  <pre><code>Subject: subject
  Content-Type: multipart/alternative; boundary=--boundary_0_989afdbb-5fe4-4155-ba59-3d5ffdbb909e
  Message-Id: &lt;20161208131903.36280C956C@in-1.mail.xxx.net&gt;
  
  ----boundary_0_989afdbb-5fe4-4155-ba59-3d5ffdbb909e
  Content-Type: text/plain; charset=utf-8
  Content-Transfer-Encoding: base64
  
  PGgxPlZPREE8L2gxPg==
  ----boundary_0_989afdbb-5fe4-4155-ba59-3d5ffdbb909e
  Content-Type: text/plain; charset=utf-8
  Content-Transfer-Encoding: base64
  
  dGVzdCBjb250ZW50
  ----boundary_0_989afdbb-5fe4-4155-ba59-3d5ffdbb909e--
  </code></pre>
  
  <p>Why System.Net.Mail.MailMessage doesn't set <code>text/html</code> contect type?</p>
  
  <pre><code>Content-Type: text/plain; charset=utf-8
  Content-Transfer-Encoding: base64
  
  PGgxPlZPREE8L2gxPg==
  </code></pre>
  
  <p>Is there any additional MailMessage property I missed?</p>