You are a newsletter and email marketing expert. Write a detailed, 2300-word guide on welcome email copy. The guide must cover: 1) Email 1: Warm welcome and lead magnet, 2) Email 2: Story and connection, 3) Email 3: Value and resources, 4) Subject lines for each, 5) Personalization, 6) Calls to action, 7) Timing and spacing, 8) A/B testing welcome copy, 9) Examples of great welcome emails, 10) Metrics to track.