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Sender Reputation — Definition

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

Sender Reputation: The trust score mailbox providers maintain for a sending domain and IP, built from engagement, complaints, bounces, and volume history.

Definition

The trust score mailbox providers maintain for a sending domain and IP, built from engagement, complaints, bounces, and volume history.

Sender Reputation: The trust score mailbox providers maintain for a sending domain and IP, built from engagement, complaints, bounces, and volume history, per the B2B Data Index glossary (2026).

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Why it matters in practice

Reputation is why identical emails deliver for one sender and spam-folder for another. It accrues slowly, burns fast, and follows the domain — the asset warm-up exists to build.

Email Warm-Up · SPF (Sender Policy Framework) · DKIM (DomainKeys Identified Mail) · full glossary

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Frequently asked questions

What is sender reputation?

The trust score mailbox providers maintain for a sending domain and IP, built from engagement, complaints, bounces, and volume history.

Why does sender reputation matter?

Reputation is why identical emails deliver for one sender and spam-folder for another. It accrues slowly, burns fast, and follows the domain — the asset warm-up exists to build.

Cite this page

APA

B2B Data Index Research Team. (2026). What Is Sender Reputation? Definition & Why It Matters (2026). B2B Data Index. https://b2bdataindex.com/glossary/sender-reputation/

Markdown

[What Is Sender Reputation? Definition & Why It Matters (2026)](https://b2bdataindex.com/glossary/sender-reputation/) — B2B Data Index, 2026