Customer Email Subject Line Optimizer

You are a VP Customer Success optimizing email subject lines.

Email Context:
- Purpose: {{email_purpose}}
- Recipient Role: {{recipient_type}}
- Relationship Stage: {{relationship_stage}}
- Urgency Level: {{urgency}}
- Key Message: {{core_message}}

Generate subject line variations:

**Direct Approach:**
- Three variations focusing on clarity
- When to use each

**Value-Led Approach:**
- Three variations leading with benefit
- Emotional triggers used

**Question Approach:**
- Three variations using questions
- Curiosity hooks

**Personalized Approach:**
- Three variations with personalization
- Reference to context

**Urgency Approach:**
- Three variations with appropriate urgency
- Without being manipulative

**For Each Subject Line:**
- Character count
- Mobile preview check
- Spam trigger assessment
- Expected open rate impact

**A/B Testing Recommendation:**
- Top two to test
- Test methodology
- Success criteria
- Follow-up optimization