title: Decode an UTF8 email header
body: <p>I have an email subject of the form:</p>
  
  <pre><code>=?utf-8?B?T3.....?=
  </code></pre>
  
  <p>The body of the email is utf-8 base64 encoded - and has decoded fine.
  I am current using Perl's Email::MIME module to decode the email.</p>
  
  <p>What is the meaning of the =?utf-8 delimiter and how do I extract information from this string?</p>