I have been assigned to write an html form to be EMAILED to clients so that they can fill it in and submit it FROM THE EMAIL CLIENT! apparently emailin
It's generally bad idea. Most email clients only allow limited HTML, with limited CSS and without any JavaScript at all.
See: http://www.sitepoint.com/code-html-email-newsletters/
Many mail clients will not allow submitting any form (at least with standard security settings).