Definition
A permanent delivery failure, usually because the address does not exist. Hard-bounced addresses should be suppressed immediately.
Glossary
Hard bounce
A permanent delivery failure, usually because the address does not exist. Hard-bounced addresses should be suppressed immediately.
Related terms
- Soft bounceA temporary delivery failure, such as a full mailbox or a server problem. Repeated soft bounces are treated like hard bounces.
- Bounce rateThe percentage of emails that could not be delivered. High bounce rates damage sender reputation.
- Suppression listA list of addresses you must never email again, such as hard bounces, complainers and unsubscribes. Honouring it protects reputation and compliance.
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