title: Convert non-ascii domain to SMTP compatible
body: <p>When customers enter email addresses with non-ascii chars like äüö our SMTP rejects to process them. </p>
  
  <p>So I think might be there is a solution to handle those domains myself and convert them to punyocode. </p>
  
  <p>Is there a simple way of doing so using c#?</p>
  
  <p>Would this work anyway? </p>