title: How to send email through SMTP to email address contain non-ASCII word
body: <p>How to send email through SMTP to email address which contain non-ASCII word.</p>
  
  <p>Consider an users with email id : téést@test.com</p>
  
  <p>Code is not throwing any exception and while checking the delivery report it gave an error message: 
  "<em>Technical details of permanent failure:
   local-part of envelope RCPT address contains utf8 but remote server did not offer SMTPUTF8</em> ".</p>
  
  <p>I am using .net 4.5 and my code sample is :</p>
  
  <pre><code>MailMessage message = new MailMessage();
  message.From="test@test.com";
  message.Subject = "subject";
  message.IsBodyHtml = true;
  message.Body = "body";
  message.To.Add("téést@test.com");
  
  SmtpClient smtp = new SmtpClient();
  smtp.Host = "SMTPServer";
  smtp.Port = "SMTPPort";
  var userName = "SMTPUserName";
  var password = "SMTPPassword";
  smtp.UseDefaultCredentials = false;
  smtp.Credentials = new NetworkCredential(userName, password);
  smtp.EnableSsl = true;
  smtp.DeliveryFormat = SmtpDeliveryFormat.International;
  smtp.Send(message);
  </code></pre>
  
  <p>Thanks In Advance.</p>