SubmitObserver.php

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<?php
namespace Magento\Quote\Observer;

use Magento\Sales\Model\Order\Email\Sender\OrderSender;
use Magento\Framework\Event\ObserverInterface;

class SubmitObserver implements ObserverInterface
{
    private $logger;

    private $orderSender;

    public function __construct(
        \Psr\Log\LoggerInterface $logger,
        OrderSender $orderSender
    ) {
        $this->logger = $logger;
        $this->orderSender = $orderSender;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $quote = $observer->getEvent()->getQuote();
        $order = $observer->getEvent()->getOrder();

        $redirectUrl = $quote->getPayment()->getOrderPlaceRedirectUrl();
        if (!$redirectUrl && $order->getCanSendNewEmailFlag()) {
            try {
                $this->orderSender->send($order);
            } catch (\Exception $e) {
                $this->logger->critical($e);
            }
        }
    }
}