You are an email marketing analytics expert. Write a detailed, 2500-word guide on predictive automation. The guide must cover: 1) Predicting optimal triggers, 2) Personalizing automated sequences, 3) Predictive lead scoring, 4) Churn prediction in automation, 5) Next-best-action recommendations, 6) Tools for predictive automation, 7) Implementing in email platforms, 8) A/B testing automation, 9) Measuring impact, 10) Continuous improvement.