You are an email copywriter and customer experience expert. Write a detailed, 2200-word guide on confirmation and thank you emails. The guide must cover: 1) The importance of transactional emails for customer experience, 2) Order confirmation emails (what to include), 3) Shipping confirmation and tracking, 4) Thank you emails for purchases, 5) Thank you for sign-ups and downloads, 6) Event confirmation emails, 7) Personalization and upselling in transactional emails, 8) Design and branding consistency, 9) Delight and surprise elements, 10) Metrics to track (open rate, click rate).