Bounce Rate (Email)

The share of sent emails that couldn't be delivered. Dead addresses (hard bounces) or temporary failures (soft). High bounce rates poison sender reputation.

Free · no signup · last reviewed August 29, 2026

The definition

The share of sent emails that couldn't be delivered. Dead addresses (hard bounces) or temporary failures (soft). High bounce rates poison sender reputation.

Why it matters to an owner

Verify lists before sending. A 5%+ bounce rate tells every mail provider you're careless, and they remember.

This is the work. Want it done?

Everything here is free to use yourself. That’s the point. If you’d rather a senior marketer just handle it, in your accounts and your name: 20-minute call, no pitch deck.

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