The document discusses how a Brazilian weight loss program called "Dieta e Saúde" implemented an email marketing user lifecycle program to increase sales and engagement while reducing daily effort. They mapped user journeys, tracked user behavior, and sent tailored emails at different points, such as introducing the product to new users, following up on abandoned carts, and more. This increased email opens by 125% and resulted in 50% of new subscriptions coming from these automated emails with almost no daily effort required.