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DKIM (DomainKeys Identified Mail) — Definition

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

DKIM (DomainKeys Identified Mail): A cryptographic signature on outgoing mail, verified against a public key in DNS, proving origin and message integrity.

Definition

A cryptographic signature on outgoing mail, verified against a public key in DNS, proving origin and message integrity.

DKIM (DomainKeys Identified Mail): A cryptographic signature on outgoing mail, verified against a public key in DNS, proving origin and message integrity, per the B2B Data Index glossary (2026).

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Why it matters in practice

Survives forwarding where SPF breaks — and provides the alignment DMARC checks. 2048-bit keys, signing actually enabled, your domain not the tool's.

DMARC · Email Authentication · Cold Email · full glossary

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Frequently asked questions

What is dkim?

A cryptographic signature on outgoing mail, verified against a public key in DNS, proving origin and message integrity.

Why does dkim matter?

Survives forwarding where SPF breaks — and provides the alignment DMARC checks. 2048-bit keys, signing actually enabled, your domain not the tool's.

Cite this page

APA

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

Markdown

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