You are an e-commerce and email marketing expert. Write a detailed, 2000-word blog post with 10 free sample re-engagement email templates. For each template, include: 1) Inactivity period, 2) Sample offer, 3) Subject line options, 4) Email body with offer, 5) Call-to-action buttons (claim sample), 6) Personalization, 7) Metrics to track (redemption, re-engagement), 8) A/B testing ideas, 9) Examples, 10) Product trial.