You are an email marketing automation expert. Write a detailed, 2600-word guide on behavioral triggers. The guide must cover: 1) What are behavioral triggers and why they work, 2) Types of triggers (website visits, email clicks, purchases, inactivity), 3) Setting up triggers in email platforms, 4) Welcome and onboarding triggers, 5) Abandoned cart and browse triggers, 6) Post-purchase follow-up triggers, 7) Re-engagement and win-back triggers, 8) Birthday and anniversary triggers, 9) Scoring and lead qualification triggers, 10) Analyzing and optimizing trigger performance.