When there is a link to an external stylesheet as follows:
<HTML>
<HEAD>
<LINK media=print href="http://www.domain.com/print.css" type=text/css
rel=stylesheet>
</HEAD>
<BODY>content</BODY></HTML>
and this external style sheet "print.css" does not exist, MIME-Lite-HTML
generates the following output:
<HTML>
<HEAD>
<style type="text/css">
</HEAD>
<BODY>content</BODY></HTML>
Because there is no closing </style> tag, the complete content will not
be visible anymore in many email clients.