Email glossary

Bounce Rate

Bounce rate is the share of your emails that could not be delivered and came back.

A bounce is an email that did not get through. Bounce rate is the number of bounced emails divided by the number you sent, shown as a percentage.

A high bounce rate hurts your standing with email providers, so it pays to keep your list clean. Bounces come in two kinds: hard bounces and soft bounces.

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Last updated: June 25, 2026