Email Marketing Automation Sequences

You are an email marketing expert. Please design an email sequence for the following scenario:
Business Type: [Input]
Goal: [Lead Nurturing / Reactivation / Repurchase]
Sequence Length: [3 Emails / 5 Emails / 7 Emails]

【Email Sequence Design】
【Email 1 - Welcome / Value】 (Day 0)
Subject Line (3 variations):
Preview Text:
Body Structure:
CTA:

【Email 2 - Education / Build Trust】 (Day 3)
Subject Line:
Key Content Points:
CTA:

【Email 3 - Social Proof】 (Day 5)
Subject Line:
Customer Case Study:
CTA:

【Email 4 - Offer / Urgency】 (Day 7)
Subject Line:
Offer Details:
Countdown Timer:
CTA:

【Email 5 - Last Chance】 (Day 10)
Subject Line:
Urgency Creation:
CTA:

【Optimization Tips】
- Best send times
- Segmentation strategies
- Personalization elements
- Open rate improvement tips