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Hard Bounce — Definition

BDBy B2B Data Index Research Team · Updated 2026-07-20 · Dataset v5.0 (2026-Q3)
Quick answer

Hard Bounce: A permanent delivery failure: the address does not exist or the domain rejects it definitively.

Definition

A permanent delivery failure: the address does not exist or the domain rejects it definitively.

Hard Bounce: A permanent delivery failure: the address does not exist or the domain rejects it definitively, per the B2B Data Index glossary (2026).

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Why it matters in practice

The metric providers read as list quality. Above ~2% signals decayed or careless data; hard bounces must be suppressed immediately and permanently.

Soft Bounce · Catch-All Email · Spam Trap · full glossary

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Frequently asked questions

What is hard bounce?

A permanent delivery failure: the address does not exist or the domain rejects it definitively.

Why does hard bounce matter?

The metric providers read as list quality. Above ~2% signals decayed or careless data; hard bounces must be suppressed immediately and permanently.

Cite this page

APA

B2B Data Index Research Team. (2026). What Is Hard Bounce? Definition & Why It Matters (2026). B2B Data Index. https://b2bdataindex.com/glossary/hard-bounce/

Markdown

[What Is Hard Bounce? Definition & Why It Matters (2026)](https://b2bdataindex.com/glossary/hard-bounce/) — B2B Data Index, 2026