Print Magento Email Body before you send it

You can use this code to display the html conent

$transport = $this->transportBuilder
    ->setTemplateIdentifier($templateId) // string id or numeric DB id both supported
    ->setTemplateOptions([
        'area'  => Area::AREA_FRONTEND,
        'store' => $storeId,
    ])
    ->setTemplateVars([
        'customer'   => $customer,
        'customer_firstname' => (string) $customer->getFirstname(),
        'customer_lastname'  => (string) $customer->getLastname(),
        'customer_email'  => (string) $customer->getEmail(),
        'store'      => $store,
        'store_name' => $store->getName(),
    ])
    ->setFromByScope($sender, $storeId)
    ->addTo(
        (string) $customer->getEmail(),
        trim((string) $customer->getFirstname() . ' ' . (string) $customer->getLastname())
    )
    ->getTransport();

{
    $body = $transport->getMessage()->getBody();

    if ($body instanceof \Symfony\Component\Mime\Part\Multipart\AbstractMultipartPart) {
        // Multipart message (old behavior)
        $parts = $body->getParts();
        $html = '';
        foreach ($parts as $part) {
            if ($part->getMediaType() === 'text' && $part->getSubType() === 'html') {
                $html = $part->getBody();
                break;
            }
        }
        echo  $html;
    } elseif ($body instanceof \Symfony\Component\Mime\Part\TextPart) {
        // Single part message (new behavior)
        echo  $body->getBody();
    } else {
        // Fallback
        echo (string)$body;
    }
}

$transport->sendMessage();

Print Magento Email Body before you send it

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