Code to Add Product Weight Below Product Name in Email Template - By WebToffee(WebToffee eCommerce Marketing Automation – Email marketing, Popups, Email customizer)

functions.php

<?php //Do not copy this line of code
add_action('woocommerce_order_item_meta_end', function($item_id, $item, $order, $plain_text) {
        $product = $item->get_product();
        if (!$product) return;

        $weight = $product->get_weight();
        if(!empty($weight)){
            echo '<br><b class="wt_product_weight">' . __('Weight:', 'woocommerce') . '</b> ' . ($weight . ' ' . get_option('woocommerce_weight_unit') );
        }
    }
, 10, 4);