Email List Health Estimator
The industry average is 25–35% engaged subscribers. If yours is lower, you're paying Klaviyo or Mailchimp for contacts who are actively hurting your sender reputation. Enter your list size, engagement rate, and monthly ESP cost to see exactly what cleaning is worth.
Industry average: 25–35% open at least once per 90 days
Estimated Deliverability Impact of Cleaning
Removing unengaged contacts typically improves open rates by and can increase inbox placement by 5–15 percentage points.
After Cleaning — What You'd Have
Why Unengaged Subscribers Cost More Than You Think
ISPs like Gmail and Outlook measure how your recipients interact with your emails. When a large portion of your list consistently doesn't open, click, or engage with your messages, ISPs interpret this as a signal that your content is unwanted — and begin routing your campaigns to the spam folder for all recipients, not just the unengaged ones.
Most ESPs charge per contact, not per email sent. You're paying full price for dead weight that's actively damaging your sender reputation. Cleaning your list is the rare action that simultaneously cuts costs AND improves performance — a compound win for email programs of any size.
The 90-day rule
Most email marketers define 'unengaged' as contacts who have not opened or clicked any email in the last 90 days. Gmail's spam classification heavily weights recent engagement signals.
Re-engagement before suppression
Before permanently removing unengaged contacts, run a 2–3 email re-engagement sequence with a clear value proposition. Keep responders, suppress the rest.
Segment, don't batch delete
Unengaged at 90 days differs from unengaged at 365 days. Build graduated suppression tiers and apply different strategies — some 90-day contacts are still recoverable.
Clean before major sends
Pre-BFCM and pre-holiday list cleaning is one of the highest-leverage deliverability actions. Sending to a clean list during peak volume periods protects your sender reputation when it matters most.
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Why We Built This Tool
ESP dashboards show engagement metrics and subscriber counts, but not the financial and reputational cost of keeping unengaged contacts. Most teams don't know how much they're paying per engaged contact — or how much deliverability they're sacrificing. This tool calculates both: the money wasted on dead weight and the inbox placement recovery available from cleaning.
What Goes Wrong Without This
Unengaged contacts damage sender reputation silently. A 20% engagement rate looks stable until Gmail and Yahoo start routing mail to spam. By then, you've been paying full ESP fees on subscribers who will never open. Cleaning fixes both problems at once, but only if you know how many contacts are truly unengaged.
Who This Tool Is For
E-commerce & DTC Brands
Marketing teams managing large lists on Klaviyo or Mailchimp who want to quantify the cost of unengaged subscribers and the ROI of list cleaning.
Email Marketing Agencies
Agencies justifying list cleaning projects to clients by calculating exact ESP cost savings and deliverability improvements.
B2B SaaS & Outbound Teams
Teams managing lead databases who need to identify and remove unresponsive contacts dragging down sender reputation.
Frequently Asked Questions
What counts as engaged?
How much will cleaning my list improve deliverability?
Should I delete unengaged subscribers or re-engage them?
Do I need an InboxEagle account to use this tool?
A Dirty List Costs You Twice: ESP Fees and Deliverability
InboxEagle's list health monitoring tracks engagement degradation over time and alerts you when your active-to-inactive ratio starts threatening sender reputation — before it triggers a blacklisting or inbox placement decline.
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