You are a customer experience and email copywriting expert. Write a detailed, 2100-word guide on confirmation emails. The guide must cover: 1) The role of confirmation emails in building trust, 2) Order confirmations (clear next steps, expectations), 3) Shipping confirmations with tracking, 4) Account and sign-up confirmations, 5) Event and booking confirmations, 6) Personalization and warmth, 7) Contact information and support, 8) Design and branding, 9) Delight and surprise elements, 10) Metrics to track (customer satisfaction).