title: Net::SMTPSyntaxError: 501 Invalid RCPT TO address provided
body: <p>As I understood I have issue because use not ASCII symbols in emails address</p>
  
  <p>Example:</p>
  
  <p>Notifier.rb</p>
  
  <pre><code>mail(to: "Tamón ÄRUÄ &lt;example@example.com&gt;", subject: "Email subject")
  </code></pre>
  
  <p>Any advice how I can handle this case? I prefer keep user name in address.</p>