Magento 2.2.4 – Subscription Success Mail Not Sent After Confirmation

Don't need to install extension and make load on site. go to

\app\locale\en_US\template\email\newsletter_subscr_success.html

delete full page content & from now you don't get any mail on news later subscription.

Search the file /app/code/core/Mage/Newsletter/Model/Subscriber.php

copy the whole content to

MyVendor/Tweaks/Newsletter/Model/Subscriber.php

Then find the below

public function confirm($code)
    {
        if($this->getCode()==$code) {
            $this->setStatus(self::STATUS_SUBSCRIBED)
                ->setIsStatusChanged(true)
                ->save();
            return true;
        }
        return false;
    }

And replace it with:

public function confirm($code)
    {
        if($this->getCode()==$code) {
            $this->setStatus(self::STATUS_SUBSCRIBED)
                ->setIsStatusChanged(true)
                ->save();

                $this->sendConfirmationSuccessEmail();
            return true;
        }

        return false;
    }