NewAction.php

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<?php
namespace Magento\Newsletter\Controller\Subscriber;

use Magento\Customer\Api\AccountManagementInterface as CustomerAccountManagement;
use Magento\Customer\Model\Session;
use Magento\Customer\Model\Url as CustomerUrl;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Phrase;
use Magento\Framework\Validator\EmailAddress as EmailValidator;
use Magento\Newsletter\Controller\Subscriber as SubscriberController;
use Magento\Newsletter\Model\Subscriber;
use Magento\Store\Model\ScopeInterface;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Newsletter\Model\SubscriberFactory;

class NewAction extends SubscriberController
{
    protected $customerAccountManagement;

    private $emailValidator;

    public function __construct(
        Context $context,
        SubscriberFactory $subscriberFactory,
        Session $customerSession,
        StoreManagerInterface $storeManager,
        CustomerUrl $customerUrl,
        CustomerAccountManagement $customerAccountManagement,
        EmailValidator $emailValidator = null
    ) {
        $this->customerAccountManagement = $customerAccountManagement;
        $this->emailValidator = $emailValidator ?: ObjectManager::getInstance()->get(EmailValidator::class);
        parent::__construct(
            $context,
            $subscriberFactory,
            $customerSession,
            $storeManager,
            $customerUrl
        );
    }

    protected function validateEmailAvailable($email)
    {
        $websiteId = $this->_storeManager->getStore()->getWebsiteId();
        if ($this->_customerSession->getCustomerDataObject()->getEmail() !== $email
            && !$this->customerAccountManagement->isEmailAvailable($email, $websiteId)
        ) {
            throw new LocalizedException(
                __('This email address is already assigned to another user.')
            );
        }
    }

    protected function validateGuestSubscription()
    {
        if ($this->_objectManager->get(ScopeConfigInterface::class)
                ->getValue(
                    Subscriber::XML_PATH_ALLOW_GUEST_SUBSCRIBE_FLAG,
                    ScopeInterface::SCOPE_STORE
                ) != 1
            && !$this->_customerSession->isLoggedIn()
        ) {
            throw new LocalizedException(
                __(
                    'Sorry, but the administrator denied subscription for guests. Please <a href="%1">register</a>.',
                    $this->_customerUrl->getRegisterUrl()
                )
            );
        }
    }

    protected function validateEmailFormat($email)
    {
        if (!$this->emailValidator->isValid($email)) {
            throw new LocalizedException(__('Please enter a valid email address.'));
        }
    }

    public function execute()
    {
        if ($this->getRequest()->isPost() && $this->getRequest()->getPost('email')) {
            $email = (string)$this->getRequest()->getPost('email');

            try {
                $this->validateEmailFormat($email);
                $this->validateGuestSubscription();
                $this->validateEmailAvailable($email);

                $subscriber = $this->_subscriberFactory->create()->loadByEmail($email);
                if ($subscriber->getId()
                    && (int) $subscriber->getSubscriberStatus() === Subscriber::STATUS_SUBSCRIBED
                ) {
                    throw new LocalizedException(
                        __('This email address is already subscribed.')
                    );
                }

                $status = (int) $this->_subscriberFactory->create()->subscribe($email);
                $this->messageManager->addSuccessMessage($this->getSuccessMessage($status));
            } catch (LocalizedException $e) {
                $this->messageManager->addExceptionMessage(
                    $e,
                    __('There was a problem with the subscription: %1', $e->getMessage())
                );
            } catch (\Exception $e) {
                $this->messageManager->addExceptionMessage($e, __('Something went wrong with the subscription.'));
            }
        }
        $this->getResponse()->setRedirect($this->_redirect->getRedirectUrl());
    }

    private function getSuccessMessage(int $status): Phrase
    {
        if ($status === Subscriber::STATUS_NOT_ACTIVE) {
            return __('The confirmation request has been sent.');
        }

        return __('Thank you for your subscription.');
    }
}