HTML in and email from AS3

try this. 

var vEmail:URLRequest = new URLRequest(" mailto:mailexample.com?subject="+yoursubjecttextfield.text+"&body="+yourmessagetextfield.text );bEmail.addEventListener(MouseEvent.CLICK,fEmailClick);function fEmailClick(event:MouseEvent):void {navigateToURL(vEmail," _blank" ) ;}

you can use the client's default email program with

var request:URLRequest = new URLRequest("mailto:name@mail.com"+"?subject=Subject"+"&body= Hello world ");

request.method = URLRequestMethod.POST;

navigateToURL(request, "_blank");