| name | email-list-cleanup |
| description | Plans email list segmentation and cleanup strategies with re-engagement criteria and sunsetting rules. Use when your list has inactive subscribers hurting deliverability. |
| allowed-tools | Read Write Glob |
| metadata | {"author":"matthewhitcham","version":"1.0"} |
Email List Cleanup
When to Use This Skill
Use this skill when you need to:
- Identify and segment inactive subscribers dragging down deliverability
- Design a re-engagement campaign to win back cold subscribers
- Create sunsetting rules for permanently removing unengaged contacts
- Improve open rates, click rates, and sender reputation through list hygiene
DO NOT use this skill for building new email lists, email content strategy, or technical deliverability audits (SPF, DKIM). This is for cleaning and segmenting an existing list.
Core Principle
A SMALLER, ENGAGED LIST OUTPERFORMS A LARGE, DEAD LIST EVERY TIME — REMOVING UNENGAGED SUBSCRIBERS IMPROVES DELIVERABILITY FOR EVERYONE WHO REMAINS.
Phase 1: List Audit Brief
Required Inputs
| Input | What to Ask | Default |
|---|
| List size | "How many total subscribers do you have?" | No default — must be provided |
| Engagement data | "Can you see open/click rates and last activity date?" | Yes, basic engagement data available |
| Current open rate | "What's your average open rate?" | Under 20% (triggering this cleanup) |
| Sending frequency | "How often do you email your list?" | Weekly |
| Email platform | "What tool are you using?" | Platform-agnostic |
| Revenue from email | "Do you make sales directly from email?" | Yes |
GATE: Confirm the audit brief before creating the cleanup plan.
Phase 2: Segmentation Plan
Engagement Segments
Define these segments based on activity:
## Subscriber Segments
**Active (keep):** Opened or clicked at least 1 email in the last 90 days
**At-risk:** Opened at least 1 email in last 90-180 days but no clicks
**Inactive:** No opens or clicks in 180+ days
**Ghost:** No opens or clicks in 365+ days, never purchased
**Purchased but inactive:** Bought something but no email engagement in 180+ days
Segment Actions
| Segment | Action |
|---|
| Active | Continue normal sending |
| At-risk | Send re-engagement sequence |
| Inactive | Send final re-engagement, then sunset |
| Ghost | Remove immediately — they are hurting deliverability |
| Purchased but inactive | Separate re-engagement with purchase reference |
GATE: Approve segments and actions before writing re-engagement emails.
Phase 3: Re-Engagement Campaign
3-Email Re-Engagement Sequence
Write three emails for the at-risk and inactive segments:
Email 1 — The Check-In
- Subject: "Still want to hear from us, {first_name}?"
- Body: Acknowledge it's been a while. Offer value. Ask them to click to stay.
- CTA: "Yes, keep me subscribed" (single click)
Email 2 — The Value Reminder (3 days later)
- Subject: "Here's what you've been missing"
- Body: Share your best recent content or offer. Remind them why they signed up.
- CTA: Link to best content or a free resource
Email 3 — The Goodbye (5 days later)
- Subject: "We're removing you from our list tomorrow"
- Body: Clear, no-guilt message. One final chance to stay.
- CTA: "Keep me on the list" button
- Note: Anyone who does not click is moved to sunset list
Sunsetting Rules
## Sunset Policy
After the 3-email re-engagement sequence:
- No engagement → remove from active list
- Opened but didn't click → keep for 30 more days, then re-evaluate
- Clicked "keep me" → move back to active segment
- Purchased customer who didn't engage → keep on a separate low-frequency list (monthly only)
Phase 4: Polish
1. Cleanup Implementation Checklist
2. Ongoing Hygiene Rules
- Run this cleanup process quarterly
- Automatically sunset subscribers with no engagement after 180 days (after re-engagement attempt)
- Remove hard bounces immediately
- Suppress role-based addresses (info@, support@)
- Monitor deliverability weekly after cleanup
3. Expected Results
After a proper cleanup, expect:
- Open rates to increase 5-15 percentage points
- Click rates to improve 1-3 percentage points
- Fewer spam complaints
- Better inbox placement (less likely to land in Promotions/Spam)
Anti-Patterns
- Never cleaning the list — a list that grows but never shrinks will see declining engagement and deliverability over time.
- Removing everyone at once — always run a re-engagement campaign first. Some inactive subscribers will come back.
- Guilt-trip goodbye emails — "We'll miss you SO much" is manipulative. Be clean and professional.
- Cleaning without fixing the root cause — if people go inactive because your emails aren't valuable, cleaning alone won't help.
- Removing purchasers too aggressively — customers who bought but don't open emails may still buy again. Use a separate, lower-frequency approach.
Recovery
- No engagement data available: Use signup date as a proxy. Anyone who signed up 12+ months ago and has no purchase history is likely inactive.
- User afraid to lose subscribers: Run the numbers — show them that 5,000 engaged subscribers will generate more revenue than 15,000 with a 10% open rate.
- Open rate tracking unreliable (Apple MPP): Focus on click data instead of opens. Clicks are the most reliable engagement signal.
- Very small list (under 500): Skip automated cleanup. Manually review the list and send personal re-engagement emails.
