PHPMailer\PHPMailer\SMTP::setError PHP Метод

    protected function setError($message, $detail = '', $smtp_code = '', $smtp_code_ex = '')
    {
        $this->error = ['error' => $message, 'detail' => $detail, 'smtp_code' => $smtp_code, 'smtp_code_ex' => $smtp_code_ex];
    }