Yes, you can open and edit the body page in dreamweaver just like any other page now. You can add the recordsets directly to the email body page, or if you want to use a recordset from the original page you just need to declare it on the top of the email body page like:
<?php
global $Recordset1, $Recordset2;
?>
That way you can use any variables from the main page in the email as well.