Helpdesk - Notification Rules customize template error

We attempted to customize the notification template to our users 'Request Complete' template. Did nothing but change the text - did not even insert html.

Problem is now the notification shows up as broken html - any ideas?

See example of the text/html as the user sees it now.

Mime-Version: 1.0
Content-Type: multipart/related;
boundary="----=_Part_1642_30852954.1154467924601"

------=_Part_1642_30852954.1154467924601
Content-Type: text/html;charset="UTF-8"
Content-Transfer-Encoding: 7bit

Dear Admin,

Request raised by you was completed. The title of the request is :

Mike Test 2

Complete details of the request can be looked at http://rrsupport/WorkOrder.do?woMode=viewWO&woID=11799

regards,
Sys Admin team
------=_Part_1642_30852954.1154467924601--