in the email template file, there should be the following code at the top:
<?php
$remove = array();
$remove[] = "";
$remove[] = "x";
$remove[] = "y";
$removeBegins = array();
$removeBegins[] = "Security";
$removeEnds = array();
$removeEnds[] = "_x";
$removeEnds[] = "_y";
$removeIncludes = array();
$removeIncludes[] = "Security";
?>
this creates three arrays for excluding elements form the email, In the first array, you can enter the beginning of a form element name, the second is the ending of a form element name, the last is used for any part of the form element name. you could add those two to the includes array:
<?php
$remove = array();
$remove[] = "";
$remove[] = "x";
$remove[] = "y";
$removeBegins = array();
$removeBegins[] = "Security";
$removeEnds = array();
$removeEnds[] = "_x";
$removeEnds[] = "_y";
$removeIncludes = array();
$removeIncludes[] = "Security";
$removeIncludes[] = "Hidden_Field";
$removeIncludes[] = "SimpleContact_submit";
?>