Tools\Mailer\Email::_isEmbeddedBlobAttachment PHP Method

    protected function _isEmbeddedBlobAttachment($content, $name)
    {
        foreach ($this->_attachments as $filename => $fileInfo) {
            if ($filename !== $name) {
                continue;
            }
            return $fileInfo['contentId'];
        }
        return false;
    }