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Suppression List — Definition

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

Suppression List: The permanent record of addresses that must never be emailed — opt-outs, complaints, hard bounces — checked before every send.

Definition

The permanent record of addresses that must never be emailed — opt-outs, complaints, hard bounces — checked before every send.

Suppression List: The permanent record of addresses that must never be emailed — opt-outs, complaints, hard bounces — checked before every send, per the B2B Data Index glossary (2026).

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Why it matters in practice

The compliance asset that outlives campaigns, vendors, and tools. Suppression failures are the fastest operational route to both legal exposure and reputation damage.

CAN-SPAM Act · GDPR · CASL · full glossary

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Frequently asked questions

What is suppression list?

The permanent record of addresses that must never be emailed — opt-outs, complaints, hard bounces — checked before every send.

Why does suppression list matter?

The compliance asset that outlives campaigns, vendors, and tools. Suppression failures are the fastest operational route to both legal exposure and reputation damage.

Cite this page

APA

B2B Data Index Research Team. (2026). What Is Suppression List? Definition & Why It Matters (2026). B2B Data Index. https://b2bdataindex.com/glossary/suppression-list/

Markdown

[What Is Suppression List? Definition & Why It Matters (2026)](https://b2bdataindex.com/glossary/suppression-list/) — B2B Data Index, 2026