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Spam Complaint Rate — Definition

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

Spam Complaint Rate: The percentage of recipients marking a message as spam, measured by mailbox providers against the authenticated domain.

Definition

The percentage of recipients marking a message as spam, measured by mailbox providers against the authenticated domain.

Spam Complaint Rate: The percentage of recipients marking a message as spam, measured by mailbox providers against the authenticated domain, per the B2B Data Index glossary (2026).

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Why it matters in practice

The metric with a cliff: Google/Yahoo require under 0.3%, with 0.1% the recommended operating alarm. Breaches degrade delivery for weeks.

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Frequently asked questions

What is spam complaint rate?

The percentage of recipients marking a message as spam, measured by mailbox providers against the authenticated domain.

Why does spam complaint rate matter?

The metric with a cliff: Google/Yahoo require under 0.3%, with 0.1% the recommended operating alarm. Breaches degrade delivery for weeks.

Cite this page

APA

B2B Data Index Research Team. (2026). What Is Spam Complaint Rate? Definition & Why It Matters (2026). B2B Data Index. https://b2bdataindex.com/glossary/spam-complaint-rate/

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[What Is Spam Complaint Rate? Definition & Why It Matters (2026)](https://b2bdataindex.com/glossary/spam-complaint-rate/) — B2B Data Index, 2026