List management
Updated
List hygiene
Definition
List hygiene is the routine of removing or suppressing email addresses that hurt deliverability: hard bounces, spam complainers, long-inactive subscribers, invalid addresses and likely spam traps.
How it works
Some cleaning happens automatically: a good ESP suppresses hard bounces, complaints and unsubscribes as they happen.
The rest is policy. A sunset policy removes subscribers who have not opened or clicked within a set period, often after a last re-engagement email. Imports get verified before the first send.
Spam traps are addresses that never signed up. Pristine traps were never real users. Recycled traps are abandoned addresses converted by a provider. Both reach lists through purchased, scraped or very old data.
Example
A simple, common sunset policy.
Why it matters
Inactive subscribers drag down engagement, which mailbox providers use to filter you. Bad addresses raise bounce rates and hit spam traps.
A smaller, engaged list usually reaches the inbox more often and earns more per email than a large, stale one.
Best practices
- Suppress hard bounces, complaints and unsubscribes immediately and permanently.
- Run a sunset policy: re-engage, then remove subscribers inactive for 90 to 180 days, depending on how often you send.
- Verify imported lists and send the first campaign to a small, recent segment.
- Never buy, rent or scrape lists.
- Treat Apple Mail Privacy Protection opens carefully. Use clicks and replies as engagement signals too.
How Lumail handles list hygiene
Lumail suppresses permanent bounces and spam complaints automatically. Automatic list cleanup can unsubscribe people who have not opened or clicked for 30, 90 or 180 days. It is off by default and you preview who it affects before enabling it.
Lumail also has an email verification API to check addresses before you add them, and pricing based on emails sent rather than subscribers, so cleaning is about deliverability, not your bill.
Check a real message with the free mail tester or the spam tester.
Frequently asked questions
How often should I clean my email list?
Bounces and complaints should be suppressed continuously. Review inactive subscribers at least every quarter, or let an automatic sunset rule do it.
What counts as an inactive subscriber?
Someone with no opens and no clicks over a window that fits your cadence, commonly 90 to 180 days. Because Apple Mail Privacy Protection inflates opens, clicks are the more reliable signal.
Should I delete or suppress cleaned contacts?
Suppress or unsubscribe them rather than deleting, so the address is not re-imported later by accident.
Related terms, tools and docs
- List managementDouble opt-inDouble opt-in (confirmed opt-in) is a signup process where a new subscriber must click a link in a confirmation email before they are added to the list.
- DeliverabilityHard bounceA hard bounce is a permanent delivery failure: the receiving server rejected the email and retrying will not help.
- MetricsSpam complaint rateSpam complaint rate is the percentage of delivered emails that recipients reported as spam.
- MetricsOpen rateEmail open rate is the percentage of delivered emails that were opened at least once.
- Free toolFree mail testerSend a real email and get an SPF, DKIM, DMARC and content report.
- Free toolFree spam testerCheck an email for the patterns that push mail to spam.
- DocsAutomatic list cleanupUnsubscribe people inactive for 30, 90 or 180 days.
- DocsEmail verification APICheck an address before you add it.
- DocsHow to lower bounce rateWhat to do when permanent bounces pass 2% or 5%.
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