When to Suppress Inactive Email Subscribers (and How)
The quick answer: a common rule is to send a short win-back series to people who haven't opened or clicked in about 3 to 6 months, then stop emailing (suppress) anyone still inactive after 6 to 12 months. Send less often to occasional readers instead of cutting them off. The exact timing depends on how often you email and how long your buying cycle is.
Why inactive subscribers hurt deliverability
- Inbox providers watch engagement. When many recipients ignore or delete your mail, Gmail, Yahoo and Outlook are more likely to put future mail in spam, including for your active readers.
- Spam complaints rise. People who forgot they signed up click "Report spam" instead of unsubscribing. Google tells bulk senders to keep their spam rate below 0.1% and never let it reach 0.3%.
- Old addresses go bad. Abandoned mailboxes are sometimes turned into spam traps, and dead ones bounce.
- You pay for them. Most email services charge by list size.
A simple sunset policy
| No opens or clicks for… | What to do |
|---|---|
| Up to 90 days | Keep sending normally |
| 3 to 6 months | Send less often, and only your best content |
| About 6 months | Send a win-back series of 2 or 3 emails: "Still want to hear from us?" with one clear button |
| 6 to 12 months, still nothing | Suppress: stop sending, but keep the address on a do-not-send list |
If you send daily, use shorter windows. If you send monthly or sell something people buy once a year, use longer ones. New subscribers who never engaged at all should be suppressed sooner.
Don't trust opens alone
Since 2021, Apple Mail Privacy Protection loads images automatically, so many Apple Mail users look like they "opened" every email. Count clicks, replies, purchases, logins and site visits as activity too, and treat opens as a weak signal.
Suppress, don't just delete
A suppression list is the set of addresses you must not email: unsubscribes, spam complainers, hard bounces and sunset inactives. Keep it, and check every new import against it, so a deleted address doesn't sneak back in from an old spreadsheet.
How to remove suppressed addresses for free
- Open Compare Email Lists and click Remove unsubscribes mode.
- Paste your mailing list into List A and your suppression list into List B. A line like
@example.comin List B removes a whole domain. - Click Compare and take the Only in A result. That's your send-safe list.
- Run it through the list cleaner to catch typos, duplicates and domains that can no longer receive mail.
Both tools run in your browser, so the list isn't uploaded anywhere.
Questions people ask
When should I remove inactive email subscribers?
A common approach is a win-back email series after about 6 months without opens or clicks, then suppression for anyone still inactive after 6 to 12 months. Shorten the windows if you email often, and lengthen them for long buying cycles.
What is the difference between unsubscribing and suppressing?
An unsubscribe is the person's choice. Suppression is any address you have decided not to email, including unsubscribes, hard bounces, spam complaints and long-term inactive subscribers.
Should I delete inactive subscribers or suppress them?
Suppress them. Keeping the address on a do-not-send list stops it from being re-imported and emailed again by accident.
Are email open rates still reliable?
Less than before. Apple Mail Privacy Protection loads images automatically, which can record opens that never happened. Use clicks, replies and purchases as stronger signs of activity.
What spam complaint rate is too high?
Google tells senders to keep their spam rate, as shown in Postmaster Tools, below 0.1% and to avoid ever reaching 0.3%.