How to format email message using node invite module?

Hi,

I am using the node invite and token module.
I have followed this flash tutorial video: http://www.adevbox.com/files/2008-06-25_1703.swf

My problem is regarding the email format being sent.

In the ?q=admin/settings/node_invite
I have checked the blog entry checkbox. Now the node invite works but I can't format my body section value correctly.

For example:
I entered in the textarea
Hi <bold>,

Then the result when I open the email message is still the same:
Hi <bold>,

Same with if I use <b>bold here</b> then it will also be the format when I open the email message.

How can I format it correctly? Am I missing something simple? I am thinking of using htmlspecialchars but I don't where to put it.
Thanks in advance :)

Kind Regards,
Mark