luya\components\Mail::smtpTest PHP Method

    public function smtpTest($verbose)
    {
        //Create a new SMTP instance
        $smtp = new SMTP();
        if ($verbose) {
            // Enable connection-level debug output
            $smtp->do_debug = 3;
        }
        try {
            // connect to an SMTP server
            if ($smtp->connect($this->host, $this->port)) {
                // yay hello
                if ($smtp->hello('localhost')) {
                    if ($smtp->authenticate($this->username, $this->password)) {
                        return true;
                    } else {
                        $data = [$this->host, $this->port, $this->smtpSecure, $this->username];
                        throw new Exception('Authentication failed (' . implode(',', $data) . '): ' . $smtp->getLastReply() . PHP_EOL . print_r($smtp->getError(), true));
                    }
                } else {
                    throw new Exception('HELO failed: ' . $smtp->getLastReply());
                }
            } else {
                throw new Exception('Connect failed');
            }
        } catch (Exception $e) {
            $smtp->quit(true);
            throw new \yii\base\Exception($e->getMessage());
        }
    }