If you create the email body using:
<?php echo(WA_getSavedFormValue("RichRegistration_NewFromBlank_Default","[fieldname]")) ?>
then all you would need on the success page is:
<?php require_once("../webassist/forms/persist.php"); ?>
and you would remove the code like:
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
WA_persistForm("session","RichRegistration_NewFromBlank_Default");
}
?>
entirely from the success page... it was used to save the form and doesn't need to be on the page to retrieve it.