Notification emails in HTML

Notification emails in HTML

When setting templates for the email notifications (i.e when a new request is logged or when a request is closed) I would like to add some HTML formatting to the email which is sent. It appears I should be able to do this but when I add any html tags they just appear in the email notification as plain text. The setting at the top of the notification rules page is "Send all e-mail notifications in : Rich Text format (HTML) "
 
Links from pre-defined variables such as $RequestLink work properly.
 
Any ideas?

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