Verified Deliverability Case Study
- Target List: 75,000 to 96,000 Dormant Contacts (Unopened for 90 to 180+ Days)
- ESP Platforms: Klaviyo / ActiveCampaign / HubSpot
- Primary Objective: Safely resurrect inactive subscribers without damaging root domain sender score
- Verified Results: 32.0% to 47.9% Open Rates | 23.0% Click-Through Rates
- Confidentiality Notice: Client database identifiers and subscriber records are withheld under NDA. Performance reports reflect audited client logs.
1. The Starting Baseline: The “Silent Profit Killer”
Every mature business with an email list exceeding 50,000 contacts sits on a hidden liability: Database Decay. Email lists naturally degrade by approximately 22% every year as users abandon old inboxes or tune out repetitive marketing.
When we took on this account, over 75,000 contacts had not opened an email in over 90 days. The company was paying thousands of dollars every month in ESP software fees just to store dead emails—while their mass broadcasts triggered spam filters and destroyed inbox placement for active buyers.
2. The 3-Phase List Resurrection Protocol
We engineered a phased re-engagement protocol designed to warm up dormant contacts safely:
- Phase 1 (Technical Scrub): Suppress hard bounces and isolate past buyers from non-buyers.
- Phase 2 (The 9-Word Conversational Probe): Send ultra-short plain-text emails in throttled daily batches of 2,500–5,000.
- Phase 3 (Ruthless Sunset): Contacts who re-engage are moved to the primary list; those who don’t are safely archived, cutting ESP billing fees.
3. Plain-Text Copy Strategy & Verified Swipes
To break through months of subscriber fatigue, we stripped out all graphic banners and deployed short, executive plain-text copy:
4. Audited Deliverability & Open Rate Proof
| Metric | Dormant Baseline | After Resurrection Protocol | Net Impact |
|---|---|---|---|
| Dormant Contacts | 75,000 inactive leads | 24,000+ Active Contacts Resurrected | 32% of Cold List Recovered |
| Open Rates | < 2% (landing in spam) | 32.0% to 47.9% | Massive Domain Reputation Boost |
| Click-Through Rate | < 0.3% | Up to 23.0% | Immediate High-Intent Buyer Traffic |
| ESP Software Costs | Paying for 75k dead contacts | 30%+ Monthly Cost Reduction | Safely Pruned Inactive Deadweight |
Have an Inactive List of 25,000+ Subscribers?
Don’t blast your list and don’t delete them blindly. Let’s run a safe, phased re-engagement protocol to unlock found cash while protecting your domain deliverability.