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Gridlode
Glossary

What is DKIM?

DomainKeys Identified Mail: cryptographic signatures on outgoing email.

The sender signs each message and publishes the public key at selector._domainkey.domain. Receivers verify the signature to confirm the mail wasn't altered and really came from the domain.

Related terms

  • SPF: Sender Policy Framework: a TXT record listing which servers may send email for a domain.
  • DMARC: A policy telling receivers what to do with mail that fails SPF and DKIM alignment.
  • MTA-STS: A policy that forces encrypted (TLS) delivery of email to a domain.