make sure that the search form is crated using the GET Method so the search criteria are sent using the query string.
Then on the results page create the send button in a form that uses the post method, but whose action will send the currant query string:
<form name="form2" method="post" action="<?php echo $_SERVER["PHP_SELF"]; ?><?php echo (isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] != "")?"?".$_SERVER["QUERY_STRING"]:""; ?>">
<input type="submit" name="button" id="button" value="Submit">
</form>
This will cause trigger the email to send. The recordset results will be limited to the search criteria so will only send the 8 emails.