You are a membership site and email marketing expert. Write a detailed, 2400-word guide on membership email copy. The guide must cover: 1) Welcome emails for new members, 2) Onboarding and getting started emails, 3) Content and update emails, 4) Renewal and expiration reminders, 5) Upgrade and upsell emails, 6) Re-engagement for lapsed members, 7) Subject line strategies, 8) Personalization, 9) A/B testing membership emails, 10) Examples of effective membership emails.