Definition
A list of addresses you must never email again, such as hard bounces, complainers and unsubscribes. Honouring it protects reputation and compliance.
Glossary
Suppression list
A list of addresses you must never email again, such as hard bounces, complainers and unsubscribes. Honouring it protects reputation and compliance.
Related terms
- Hard bounceA permanent delivery failure, usually because the address does not exist. Hard-bounced addresses should be suppressed immediately.
- Spam complaint rateThe percentage of recipients who mark your email as spam. Providers cap this very low, often around 0.1 to 0.3 percent, and exceeding it harms deliverability quickly.
- List-UnsubscribeAn email header that lets recipients unsubscribe directly from the inbox in one click. Providers increasingly require it for bulk senders.
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