$TRACKER = $ENV{'HTTP_REFERER'};
if (!($TRACKER)) { $TRACKER = $ENV{'REMOTE_ADDR'};}
#added
if (!($TRACKER)) { $TRACKER = ""; }

# why would these ENV variables BOTH be blank ???

$client_email = $query->param('email');
#added
if (!($client_email)) { $client_email=""; }
chomp($client_email);

#added to other query vars...