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Glossary Index

List Hygiene

The practice of cleaning email lists by removing invalid or unengaged addresses to improve deliverability.

What is List Hygiene?

List hygiene refers to the process of regularly cleaning and maintaining your email subscriber list. The goal is to keep only valid, engaged contacts while removing or suppressing those who are invalid, inactive, or risky.

Why it matters

Good list hygiene improves engagement and reduces Bounces, Invalid Emails, and Spam Complaints. A clean list tells mailbox providers that your emails are wanted, boosting deliverability and inbox placement. Poor hygiene does the opposite, leading to wasted costs and reputation damage.

How it works

  • Remove addresses that generate hard bounces.
  • Suppress unengaged users after a set period (e.g., 90 days).
  • Use double opt-in to ensure new subscribers are legitimate.
  • Validate addresses at signup to prevent typos or bots.

AutoSend helps by automatically suppressing bad addresses and providing engagement data for list-cleaning decisions.

Examples

  • Running a quarterly purge of subscribers who haven't opened in six months.
  • Blocking signups from disposable email providers.
  • Sending a re-engagement campaign before suppressing inactive users.

Best practices

  • Clean your list at least quarterly (more often for high-volume senders).
  • Validate addresses at entry with real-time checks.
  • Avoid buying lists — they're full of invalids and spam traps.

Related terms

Suppression List, Bounce Rate

FAQs

How often should I clean my list?
At least every three months. For senders with large daily or weekly volumes, monthly checks are ideal. The more often you send, the faster bad addresses accumulate.

What should I do with inactive subscribers?
Try a re-engagement campaign first. If they don't respond, suppress or remove them. Continuing to send to inactive addresses lowers engagement and hurts reputation.

Does list hygiene really improve deliverability?
Yes. Mailbox providers measure engagement across your entire list. When fewer people open or click, they assume your mail is low quality. A clean list maximizes positive engagement signals.