title: New lines (\r\n) are not working in email body
body: <p>I am using PHP <code>mail()</code> function:</p>
  
  <pre><code>    $to      = 'AAAA &lt;postmaster@xxx.xx&gt;';
      $subject = 'BBBB';
      $message = "CCCC\r\nCCCC CCCC \r CCC \n CCC \r\n CCC \n\r CCCC";
      $headers = 'From: DDD&lt;postmaster@xxx.xx&gt;' . "\r\n";
      $headers .= "Content-Type: text/html; charset=\"UTF-8\"; format=flowed \r\n";
      $headers .= "Mime-Version: 1.0 \r\n"; 
      $headers .= "Content-Transfer-Encoding: quoted-printable \r\n";
      mail($to, $subject, $message, $headers);
  </code></pre>
  
  <p>When I receive this email it looks like this:</p>
  
  <pre><code>CCCC CCCC CCCC CCC CCC CCC CCCC
  </code></pre>
  
  <p>I would expect something like this:</p>
  
  <pre><code>CCCC
  CCCC CCCC CCC 
  CCC 
  CCC 
  CCCC
  </code></pre>
  
  <p><br>
  It works fine without <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type" rel="noreferrer"><code>Content-Type</code></a> HTTP header. How can I make <em>new lines</em> and still use my "Content-Type" declaration?</p>