Glossary · Security and privacy
DKIM
DomainKeys Identified Mail, a signature over a message's headers and body made with a private key whose public half is published in DNS under a selector.
What DKIM means
DomainKeys Identified Mail, a signature over a message's headers and body made with a private key whose public half is published in DNS under a selector. It survives forwarding because it is computed over the content, and its d= domain is what DMARC aligns against; a domain with mail and no DKIM has one point of failure.
Where DKIM comes up on this site
- DMARC p=none to p=quarantine without losing mail: a guideIt asks two questions of results that SPF and DKIM already produced, and one question about alignment.
- Release notes 29 Sep 2026: finding states, sitemap, trustTrust center, terms, refunds /trust is built from the running configuration rather than written about it: the retention table reads the real TTLs (reports 90 days, leads 180, the comment queue 30, Search Console and Business Profile data 400, sessions 12…
Terms this definition uses
Definitions that name DKIM
Related terms in Security and privacy
Where an agent, a tool or a page can be turned against its operator, and the controls that limit the damage without proving safety.
Indirect prompt injection · Direct prompt injection · Jailbreak · Data exfiltration · Sensitive information disclosure · Secret leakage · Insecure output handling · Excessive agency · Least privilege · Trust boundary · Input validation · Output validation · Allowlist · Denylist · SSRF · RCE · Credential scope · OAuth scope · API key · Bearer token · mTLS · Rate-limit policy · Audit log · PII · Data minimization · Purpose limitation · Retention period · Data residency · Tenant isolation · Threat model · DMARC · DMARC alignment · SPF · MTA-STS · TLS-RPT · CAA record · DNSSEC · hard bounce
Questions about DKIM
What is DKIM?
DomainKeys Identified Mail, a signature over a message's headers and body made with a private key whose public half is published in DNS under a selector.
Which area of the glossary does DKIM belong to?
Security and privacy: Where an agent, a tool or a page can be turned against its operator, and the controls that limit the damage without proving safety.
See it in the full glossary · 668 terms across 19 areas.