Email List Hygiene: Clean Your List
Your list decays about 20–30% a year. Clean it regularly or your deliverability slowly bleeds out. Here's a practical hygiene routine.
TL;DR
Remove hard bounces, suppress complainers, prune long-term inactives and watch for spam traps. A clean list keeps bounces and complaints low and reputation high.
Why lists decay
People change jobs, abandon inboxes and lose interest. Sending to dead or disengaged contacts spikes bounces, invites complaints, and risks spam traps — all reputation killers.
The hygiene checklist
- Suppress hard bounces immediately and permanently.
- Remove complainers from feedback loops.
- Prune inactives — no opens/clicks in 3–6 months gets a re-engagement attempt, then removal.
- Validate periodically with an email-verification service.
- Honour unsubscribes instantly.
Watch for spam traps
Spam traps are addresses used to catch senders with poor hygiene. Pristine traps never opted in; recycled traps are abandoned addresses. Double opt-in and pruning keep them off your list.
Segment by engagement
Group subscribers by recency of engagement. Send most often to your most engaged, less often to cooler segments. This boosts the positive signals that drive deliverability.
Re-engagement before removal
Before deleting inactives, try a short win-back campaign. Those who don't respond should go — keeping them only drags you down.
AutoPMTA's bounce and suppression handling keeps your list clean automatically. See pricing.
Key takeaways
- Lists decay ~20–30% per year — clean regularly.
- Suppress bounces and complainers; prune inactives.
- Avoid spam traps with double opt-in and pruning.
- Segment by engagement and run win-backs before removal.
Frequently asked questions
How often should I clean my email list?+
Continuously suppress hard bounces and complainers, and run a deeper clean (pruning inactives and validating addresses) at least quarterly, or before any large campaign.
What are spam traps?+
Spam traps are email addresses used by providers and blacklist operators to identify senders with poor list hygiene. Hitting them damages reputation. Double opt-in and regular pruning keep them off your list.
Should I delete inactive subscribers?+
Yes, after a re-engagement attempt. Contacts who don't open or click for 3–6 months and ignore a win-back campaign should be removed, as they drag down engagement and deliverability.