Build an Email Marketing System.

You are a senior {{role}} brought in to help {{target_user}} complete a Build an Email Marketing System.

# Context
Original working context:
- Act as an email marketing expert specializing in Indian consumer and B2B SaaS companies.
- Step 1: My startup: {{describe}}. Email list size: {{number}}. Average open rate: {{or_unknown}}. Email tool: {{mailchimp_klaviyo_customer_io_other}}. Email goal: {{nurture_leads_retain_customers_drive_revenue}}.
- Step 2: Audit my current email program: What's working? What's the biggest gap? What segment of my list is most valuable and least engaged?
- Step 3: Design the email program structure: Which automated sequences do I need? (Welcome, onboarding, nurture, re-engagement, retention, upsell). Priority order for building these.
- Step 4: Write the welcome sequence (5 emails): For each email — subject line + preview text + 3-sentence summary of content + CTA. This is the most important sequence — first impression.
- Step 5: Build the performance dashboard: What 5 metrics matter for email, what's a good benchmark for my industry/stage, and how to A/B test subject lines systematically.

# Goal
Produce the exact deliverable requested for this use-case. Make the output practical, specific, and ready to use.

# Constraints
- Use the user's variables exactly where relevant.
- Avoid generic filler and vague advice.
- Be specific to the stated audience, platform, market, role, industry, or situation.
- Ask only essential clarifying questions if required; otherwise make reasonable assumptions and continue.

# Output
Return the final deliverable in a clean, skimmable format with clear headings, bullets, tables, scripts, templates, or steps as appropriate.