Magento – Send personalized email (different template) on customer registration on magento2

You can override Magento Sales module functionality to create a second email template and send it to admin using custom code.

Alternatively, if you are searching for a pre-made module, then have a look at this module.

I have used it for one of my clients and it works fine.

I am using this code for sending email.

namespace [Vender]\[Extension]\Controller\Index;

use Magento\Framework\App\Action\Context;
use Magento\Framework\App\RequestInterface;
use \Magento\Framework\Mail\Template\TransportBuilder;
use \Magento\Framework\Translate\Inline\StateInterface;
use Psr\Log\LoggerInterface;

class Sendmail extends \Magento\Framework\App\Action\Action
{
    const XML_PATH_EMAIL_ADMIN_QUOTE_SENDER = 'Email Sender';
    const XML_PATH_EMAIL_ADMIN_QUOTE_NOTIFICATION = 'Your Template Path';
    const XML_PATH_EMAIL_ADMIN_NAME = 'Sender Name';
    const XML_PATH_EMAIL_ADMIN_EMAIL = 'Receiver Email';

    protected $inlineTranslation;
    protected $transportBuilder;
    protected $_logLoggerInterface;

    public function __construct(
    Context $context,
    StateInterface $inlineTranslation,
    TransportBuilder $transportBuilder,
    LoggerInterface $logLoggerInterface,
    array $data = [])
    {
        $this->inlineTranslation = $inlineTranslation;
        $this->transportBuilder = $transportBuilder;
        $this->_logLoggerInterface = $logLoggerInterface;
        parent::__construct($context,$data);
    }


    public function execute()
    {
        try
        {

            // Send Mail
            $this->inlineTranslation->suspend();
            $storeScope = \Magento\Store\Model\ScopeInterface::SCOPE_STORE;
            $transport = $this->transportBuilder
               ->setTemplateIdentifier($this->scopeConfig->getValue(self::XML_PATH_EMAIL_ADMIN_QUOTE_NOTIFICATION, $storeScope))
               ->setTemplateOptions(
                    [
                        'area' => 'frontend',
                        'store' => \Magento\Store\Model\Store::DEFAULT_STORE_ID,
                    ]
                )
               ->setTemplateVars([
                    'var1'  => 'Value',
                    'var2'  => 'Value'
                ])
               ->setFrom($this->scopeConfig->getValue(self::XML_PATH_EMAIL_ADMIN_QUOTE_SENDER, $storeScope))
               ->addTo($this->scopeConfig->getValue(self::XML_PATH_EMAIL_ADMIN_EMAIL, $storeScope))
               ->getTransport();
            $transport->sendMessage();
            $this->inlineTranslation->resume();
        } catch(\Exception $e){
            $this->_logLoggerInterface->debug($e->getMessage());
            exit;   
        }
    }
}