Sending e-mail with flash

Okay, I am already sending e-mail with flash but I need to send HTML formatted e-mail with flash. I’m using AS3, and ultimately this will NOT be a web based application, it is an AIR app.

The best I can figure is that I need to be able to send the Content-Type headers.

This is basically what I am using right now:

var mailMsg:URLRequest = new URLRequest("mailto:"+email);
var variables:URLVariables = new URLVariables();
variables.subject = "subject";
variables.body = bodyText;
mailMsg.data = variables;
mailMsg.method = URLRequestMethod.GET;
navigateToURL(mailMsg); 

I can not seem to figure this out! Anyone have any clue?
Thanks!
-Logan