Process system_send_email_action form submissions.
function system_send_email_action_submit($form, $form_state) {
$form_values = $form_state['values'];
// Process the HTML form to store configuration. The keyed array that
// we return will be serialized to the database.
$params = array(
'recipient' => $form_values['recipient'],
'subject' => $form_values['subject'],
'message' => $form_values['message'],
);
return $params;
}