You are an e-commerce email marketing expert. Write a detailed, 2500-word guide on behavioral triggers for retention. The guide must cover: 1) Post-purchase triggers, 2) Replenishment triggers, 3) Win-back triggers, 4) Birthday and anniversary triggers, 5) Loyalty program triggers, 6) Review request triggers, 7) Setting up trigger-based sequences, 8) Personalization based on behavior, 9) Examples of retention triggers, 10) Measuring impact on LTV.