[Magento 2]发送Email的步骤 | The Procedure of Send Email in Magento 2

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    // file: vendor/magento/module-customer/Model/EmailNotification.php

    /**
     * Send email to customer when his password is reset
     *
     * @param CustomerInterface $customer
     * @return void
     */
    private function passwordReset(CustomerInterface $customer)
    {
        $storeId = $customer->getStoreId();
        if (!$storeId) {
            $storeId = $this->getWebsiteStoreId($customer);
        }

        $customerEmailData = $this->getFullCustomerObject($customer);

        $this->sendEmailTemplate(
            $customer,
            self::XML_PATH_RESET_PASSWORD_TEMPLATE,
            self::XML_PATH_FORGOT_EMAIL_IDENTITY,
            ['customer' => $customerEmailData, 'store' => $this->storeManager->getStore($storeId)],
            $storeId
        );
    }
   
    /**
     * Send corresponding email template
     *
     * @param CustomerInterface $customer
     * @param string $template configuration path of email template
     * @param string $sender configuration path of email identity
     * @param array $templateParams
     * @param int|null $storeId
     * @param string $email
     * @return void
     */
    private function sendEmailTemplate(
        $customer,
        $template,
        $sender,
        $templateParams = [],
        $storeId = null,
        $email = null
    ) {
        $templateId = $this->scopeConfig->getValue($template, 'store', $storeId);
        if ($email === null) {
            $email = $customer->getEmail();
        }
        $transport = $this->transportBuilder->setTemplateIdentifier($templateId)
            ->setTemplateOptions(['area' => 'frontend', 'store' => $storeId])
            ->setTemplateVars($templateParams)
            ->setFrom($this->scopeConfig->getValue($sender, 'store', $storeId))
            ->addTo($email, $this->customerViewHelper->getCustomerName($customer))
            ->getTransport();

        $transport->sendMessage();
    }