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SPF (Sender Policy Framework) — Definition

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

SPF (Sender Policy Framework): A DNS TXT record listing the servers authorized to send email for a domain, checked by receivers at connection time.

Definition

A DNS TXT record listing the servers authorized to send email for a domain, checked by receivers at connection time.

SPF (Sender Policy Framework): A DNS TXT record listing the servers authorized to send email for a domain, checked by receivers at connection time, per the B2B Data Index glossary (2026).

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Why it matters in practice

One of the three authentication pillars required of bulk senders since 2024. One record per domain, under 10 DNS lookups, never +all.

DKIM (DomainKeys Identified Mail) · DMARC · Email Authentication · full glossary

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Frequently asked questions

What is spf?

A DNS TXT record listing the servers authorized to send email for a domain, checked by receivers at connection time.

Why does spf matter?

One of the three authentication pillars required of bulk senders since 2024. One record per domain, under 10 DNS lookups, never +all.

Cite this page

APA

B2B Data Index Research Team. (2026). What Is SPF? Definition & Why It Matters (2026). B2B Data Index. https://b2bdataindex.com/glossary/spf/

Markdown

[What Is SPF? Definition & Why It Matters (2026)](https://b2bdataindex.com/glossary/spf/) — B2B Data Index, 2026