Why inactive subscribers are a cost, not just a statistic
Most email platforms price by list size. A subscriber who has not opened anything in a year costs the same as your best customer. They also hurt deliverability: mailbox providers watch engagement and spam complaints, and people who forgot subscribing are the ones most likely to click Report spam. A cleanup can lower your bill and improve inbox placement at the same time, but only if you understand how your platform counts.
How each platform counts
| Platform | What counts toward the bill or cap | What does not | Timing catch |
|---|---|---|---|
| Kit | Confirmed subscribers, including cold ones [1] | Not stated in the cleaning article | Switch to a lower tier from Account & Billing after cleaning [1] |
| MailerLite | Unique subscribers with Active status [2] | Unsubscribed and bounced [2] | Any address Active during the cycle counts, even if deleted later; resets on billing anniversary [2] |
| Mailchimp | Subscribed, unsubscribed and non-subscribed contacts [4] | Archived, cleaned and deleted [4] | Archive unsubscribes to reduce the count [4] |
Define inactive before you delete anyone
Kit has a fixed definition: confirmed subscribers who have not opened or clicked in the last 90 days, or 30 days for people subscribed fewer than 90 days. [1] MailerLite's Free plan FAQ describes inactive subscribers as those who no longer open your campaigns and points to a Clean up inactive tab in the Subscribers section. [3]
Opens are an imperfect signal because some mail apps load images automatically and others block them. Treat a click, a purchase or a reply as stronger evidence of interest than an open, and never delete recent customers solely because they do not open newsletters.
A re-engagement process (procedure)
- Export the inactive segment and keep the file privately as a record.
- Send two or three short emails over about two weeks with one clear action: click to stay subscribed.
- Tag or group everyone who clicks and remove them from the inactive segment.
- Unsubscribe or remove non-responders. Kit's ad hoc cleaning template does this automatically, unsubscribing people who do not click within the delay period, one week by default. [1]
- Do the removal a few days before your billing date. In MailerLite, remember the cycle rule means the drop shows from the next cycle. [2]
- In Kit, check Account & Billing for a lower tier after cleaning. [1]
Worked example (hypothetical numbers)
A list has 1,150 confirmed subscribers, of which 260 are cold by the platform's definition. If the platform's tiers break at 1,000, removing 151 or more of the 260 moves the account into the lower tier. Only removing people above the threshold changes the bill; moving from 1,150 to 1,050 changes nothing if the tier is still 1,001 to 2,500. Check your platform's tier breakpoints first, then decide how aggressive the cleanup needs to be.
Decide by business value, not open rate alone
Some subscribers never open newsletters but still buy, book or reply. Before you remove anyone, cross-check the inactive segment with your customer list, recent purchases or booking records where you can. Keep anyone with recent business activity and put them in a lower-frequency group. Remove only the people who show no interest by any measure you have.
Set a calendar rule so the cleanup happens on a schedule, for example quarterly and a few days before the billing date, instead of only when an upgrade notice arrives.
Pitfalls
- Deleting unsubscribes in a tool where an unsubscribe record protects people from being re-imported. Prefer archive or keep the suppression list.
- Re-uploading contacts to dodge a limit, which MailerLite says violates its terms. [2]
- Cleaning right after the billing date in MailerLite and expecting an immediate refund of the difference. [2]
- Mailing a dormant list in one large blast. Warm up with your most engaged segment first.
Questions before you decide
What is a cold subscriber in Kit?
Kit defines cold subscribers as confirmed subscribers who have not opened or clicked in the last 90 days, or 30 days if they joined fewer than 90 days ago. They still count toward your bill.
If I delete subscribers in MailerLite today, does my bill drop today?
Not necessarily. MailerLite uses a cumulative count per billing cycle: any address that was Active at any point in the cycle counts toward the limit even if deleted later. The count resets on your billing anniversary.
Can I delete and re-import contacts to stay under a plan?
No. MailerLite says deleting subscribers and re-uploading new ones to bypass plan limits violates its terms of service.
Sources & verification
Product details and prices can change. Check the linked provider before buying.
- Kit Help: Cleaning and managing your list Accessed 13 Oct 2026
- MailerLite Help: Everything about subscription plan and billing Accessed 13 Oct 2026
- MailerLite Help: Free plan update FAQ Accessed 13 Oct 2026
- Mailchimp Help: About Mailchimp pricing plans Accessed 13 Oct 2026
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