[...]
	$result= $wpdb->get_results("SELECT * FROM kel_cf7dbplugin_submits WHERE field_name = 'your-name' ORDER BY submit_time DESC LIMIT 1");
        $user_mail = $fivesdraft->field_value;

	if (is_array($on_sent_ok) && count($on_sent_ok) > 0)
	{
		wp_redirect(trim($on_sent_ok[0]) . '?user=' . $user_mail);
		exit;
	}
}

[...]
        $result= $wpdb->get_results("SELECT * FROM kel_cf7dbplugin_submits WHERE field_name = 'your-name' ORDER BY submit_time DESC LIMIT 1");
        $user_mail = $result->field_value;

        if (is_array($on_sent_ok) && count($on_sent_ok) > 0)
        {
                wp_redirect(trim($on_sent_ok[0]) . '?user=' . $user_mail);
                exit;
        }
}