You are an email marketing and customer loyalty expert. Write a detailed, 2000-word blog post with 10 birthday and anniversary email templates. For each template, include: 1) Occasion type (birthday, anniversary with brand, loyalty milestone), 2) Subject line options, 3) Email body with celebratory copy, 4) Special offer or gift, 5) Expiration and urgency, 6) Personalization, 7) Call-to-action buttons, 8) Design and visual ideas, 9) Metrics to track (redemption rate), 10) A/B testing ideas.