public function sendFile($filePath, $attachmentName = null, $options = [])
    {
        if (!isset($options['mimeType'])) {
            $options['mimeType'] = FileHelper::getMimeTypeByExtension($filePath);
        }
        if ($attachmentName === null) {
            $attachmentName = basename($filePath);
        }
        $handle = fopen($filePath, 'rb');
        $this->sendStreamAsFile($handle, $attachmentName, $options);

        return $this;
    }