Email list optimization - and how to run it (with or without AI)
The unengaged-subscriber cleanup that protects deliverability - the exact audit steps and sunset criteria, by hand or with AI.
How to optimize your email list
List optimization comes down to finding who is disengaged, why, and acting before it hurts deliverability.
- 1.
Unengaged 90+ day segment - No opens or clicks in 90+ days signals inbox providers to distrust your sends
- 2.
Engagement decay trend - Track month-over-month drop in open rate to catch decay before it's severe
- 3.
Sunset or re-permission flow - Give unengaged subscribers one last chance before removing them
- 4.
Recent purchasers vs never-purchased - Cross-reference Shopify orders so you don't sunset active buyers
- 5.
Domain-level deliverability check - High unengaged rates at gmail/yahoo hurt whole-domain sender reputation
- 6.
List growth vs churn ratio - Ensures new signups aren't being offset by silent unsubscribes
Takeaway: Run this audit monthly so unengaged subscribers never quietly pile up and drag down deliverability.
How e-commerce teams run Klaviyo list hygiene audits
Time per report
Popular tools
- Klaviyo segments - Build unengaged filters based on last open/click date
- Shopify order exports - Cross-check unengaged emails against recent purchase history
- Spreadsheets - Merge exports, calculate decay trend, draft counts manually
Time to set up
2-3 hrs per run
Cadence: Ad-hoc, often skipped for months
Who does it: Email marketer plus analyst pulling exports
Coverage: Spot-checks top segments only
Delivered as: Spreadsheet built when someone asks
Implement it with AI
Schedule
Integrations
Klaviyo
ShopifyChannel