title: C# How to set 'return-path' for smtp mail
body: <p>I am trying to set the 'return-path' for my emails but I'm not seeing it as an available parameter.  It seems like replytolist is not the same thing.  I wan't to set the location that bounced emails are delivered.  Here is my code so far:</p>
  
  <pre><code>    private static void SendMail(string html,string taxId,string toEmail,string filePath,string fromEmail,string replyToEmail,string emailSubject,string emailAttachPath)
      {
          try
          {
              MailMessage mail = new MailMessage();     
              mail.From = new MailAddress(fromEmail);
              mail.To.Add(toEmail);
  
              mail.Subject = emailSubject;
              mail.Body = html;
  
              //specify the priority of the mail message
              mail.ReplyToList.Add(replyToEmail);
  
              SmtpClient SmtpServer = new SmtpClient("smtp.server.com");
              SmtpServer.Port = 25;
              SmtpServer.UseDefaultCredentials = true;
              SmtpServer.EnableSsl = false;
              mail.IsBodyHtml = true;
  
              SmtpServer.Send(mail);
  
          }
          catch (Exception ex)
          {
              Console.WriteLine(ex.ToString());
          }
      }
  </code></pre>