PHPMailer\PHPMailer\POP3::disconnect PHP Method

    public function disconnect()
    {
        $this->sendString('QUIT');
        //The QUIT command may cause the daemon to exit, which will kill our connection
        //So ignore errors here
        try {
            @fclose($this->pop_conn);
        } catch (Exception $e) {
            //Do nothing
        }
    }