Formatted output for email body in Bursting control File.

I am trying to format body  of an E-Mail from a bursting control file.

But the email is not getting formatted. Final E-mail is coming with all HTML tags.

Is their a way to format the body? Can i include Company logo and template to email body?

Below is my Control file.

<?xml version="1.0"?>

<xapi:requestset xmlns:xapi="http://xmlns.oracle.com/oxp/xapi" type="bursting">

  <xapi:globalData location="stream" />

  <xapi:request select="/RAXINV_NEW/LIST_G_ORDER_BY/G_ORDER_BY">

    <xapi:delivery>

      <xapi:email id="XXEMAIL" server="mailhost.xx.com" port="25" from="${FROM_EMAIL}" reply-to="${FROM_EMAIL}">

        <xapi:message id="XXEMAIL" to="${TO_EMAIL}" attachment="true" content-type="html/text" subject="Invoice">