yupe\components\Mail::init PHP Method

    public function init()
    {
        $this->_mailer = new \PHPMailer();
        switch ($this->method) {
            case 'smtp':
                $this->_mailer->isSMTP();
                $this->_mailer->Host = $this->smtp['host'];
                if (!empty($this->smtp['username'])) {
                    $this->_mailer->SMTPAuth = true;
                    $this->_mailer->Username = $this->smtp['username'];
                    $this->_mailer->Password = $this->smtp['password'];
                } else {
                    $this->_mailer->SMTPAuth = false;
                }
                if (isset($this->smtp['port'])) {
                    $this->_mailer->Port = $this->smtp['port'];
                }
                if (isset($this->smtp['secure'])) {
                    $this->_mailer->SMTPSecure = $this->smtp['secure'];
                }
                if (isset($this->smtp['debug'])) {
                    $this->_mailer->SMTPDebug = (int) $this->smtp['debug'];
                }
                break;
            case 'sendmail':
                $this->_mailer->isSendmail();
                break;
            default:
                $this->_mailer->isMail();
        }
        $this->_mailer->CharSet = \Yii::app()->charset;
        parent::init();
    }