You are a SaaS and email marketing expert. Write a detailed, 2200-word blog post with 10 SaaS onboarding email templates. For each template, include: 1) Timing (Day 1, 3, 7, 14), 2) Goal (account setup, feature adoption, first value), 3) Subject line options, 4) Email body with clear instructions, 5) Links to resources and help, 6) Call-to-action buttons, 7) Personalization, 8) Metrics to track (activation rate), 9) A/B testing ideas, 10) Examples.