src/MimeMailer/Mailer.php
protected function boot()
    {
        if (defined('PHP_EOL')) {
            self::$LINE_ENDING = PHP_EOL;
        } else {
            self::$LINE_ENDING = (strpos(PHP_OS, 'WIN') === false) ? "\n" : "\r\n";
        }
        $this->setRegistry('X-Mailer', "PHP ".PHP_VERSION." - ".self::MM_CLASSNAME." ".self::MM_CLASSVERSION, 'headers');
    }
protected function boot()
    {
        if (defined('PHP_EOL')) {
            self::$LINE_ENDING = PHP_EOL;
        } else {
            self::$LINE_ENDING = (strpos(PHP_OS, 'WIN') === false) ? "\n" : "\r\n";
        }
        $this->setRegistry('X-Mailer', "PHP ".PHP_VERSION." - ".self::MM_CLASSNAME." ".self::MM_CLASSVERSION, 'headers');
    }
First initialization of the object

@return void