your email is set to use the rsMEMBRS members recordset. the rsMEMBRS recordset is set to filter on the MemberID quersyrstring variable which is not being sent with the form post, this means when the form posts, the recordset is empty.
change the forms action:
<form id="form1" name="form1" method="post" action="">
to:
<form id="form1" name="form1" method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?><?php echo (isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] != "")?"?".htmlspecialchars($_SERVER["QUERY_STRING"]):""; ?>">