Thanks for taking the time to submit the feature request. The UPS Shipping Method extension does not handle shipping label purchases, so that notification email would need to be sent by the service where you purchase the labels. You can use a service like ShipStation (https://woocommerce.com/products/shipstation-integration/) to purchase discounted shipping labels and handle the email notifications you’re looking for.
Thanks for taking the time to submit the feature request. The UPS Shipping Method extension does not handle shipping label purchases, so that notification email would need to be sent by the service where you purchase the labels. You can use a service like ShipStation (https://woocommerce.com/products/shipstation-integration/) to purchase discounted shipping labels and handle the email notifications you’re looking for.