Using an HTML Template in an Email gives a Blank Page when Previewed in Internet Explorer

Blank page problem is caused by a mistake in the email template definition.

In <STYLE> section there is comment end tag missing - because of that, all e-mail content shows as hidden "comment".

To resolve, add end comment tag - instead of:
<style type="text/css">
<!--
...
</style>


use:
<style type="text/css">
<!--
...
-->
</style>