List hygiene
List hygiene is the ongoing practice of keeping an email list clean and accurate — verifying addresses, removing invalid and hard-bounced contacts, suppressing unsubscribes and long-term non-engagers, and avoiding purchased or scraped data. Good hygiene protects deliverability and keeps sender reputation healthy.
How it works
You verify addresses before sending, suppress bounces and opt-outs automatically, periodically re-validate aging records, and prune contacts who haven't engaged in a long time. The list is treated as a living asset that degrades if left untouched.
Why it matters
Dirty lists cause bounces, spam-trap hits and complaints — the exact signals that get a domain blocklisted. Since reputation damage affects all your mail, list hygiene is one of the highest-leverage, lowest-cost deliverability practices available.
How Autocloz handles it
Autocloz enforces list hygiene by verifying addresses before send, auto-suppressing hard bounces and opt-outs across all channels, and flagging catch-all and risky records so a stale import can't silently poison your sending reputation.
FAQ
How often should I clean my email list?
Verify at import and before major sends, and re-validate aging lists periodically (many teams quarterly). Suppress bounces and opt-outs continuously in real time rather than in occasional batches, so bad addresses never get a second send.
Why does list hygiene affect deliverability?
Sending to invalid addresses and spam traps produces bounces and complaints, which mailbox providers read as signs of a poorly maintained list. That lowers your sender reputation and pushes even your good mail toward spam.
Related terms
Email bounce rate is the percentage of sent emails that are returned undelivered. Hard bounces are permanent (invalid or non-existent address); soft bounces are temporary (full mailbox, server down). A high bounce rate signals a poor list and damages sender reputation.
A spam trap is an email address operated by mailbox providers and blocklist operators specifically to catch senders with poor list hygiene. There's no real person behind it, so any mail it receives indicates you're emailing addresses you didn't earn permission to contact.
Email verification is the process of checking whether an email address is valid and safe to send to — confirming the syntax, domain and mailbox exist and aren't a known trap or disposable address — before you add it to a campaign. It is the single most effective way to control bounce rate.
A hard bounce is a permanent email delivery failure — the address is invalid, the domain doesn't exist, or the mailbox was deleted — and should be suppressed immediately. A soft bounce is a temporary failure — a full mailbox, a message too large, or a server briefly down — which may succeed on a later retry.