You are a blogger and email marketing expert. Write a detailed, 2600-word guide on email for bloggers. The guide must cover: 1) Choosing an email platform for bloggers, 2) Creating lead magnets that attract readers, 3) Welcome sequences for new subscribers, 4) Newsletter content strategies, 5) Promoting blog posts via email, 6) Affiliate marketing emails, 7) Sponsored content and partnerships, 8) Building community through email, 9) List growth strategies for bloggers, 10) Analytics and metrics for bloggers.