You are a newsletter and email marketing expert. Write a detailed, 2000-word blog post with 10 newsletter welcome email templates. For each template, include: 1) Welcome email goal (deliver lead magnet, set expectations), 2) Subject line options, 3) Email body with warm copy, 4) Lead magnet delivery, 5) What to expect (frequency, content), 6) Call-to-action buttons, 7) Personalization, 8) Metrics to track (open rate, click rate), 9) A/B testing ideas, 10) Examples.