Glossary / DKIM
What is DKIM?
DKIM adds a cryptographic signature to your outgoing email so a receiving server can confirm the message really came from your domain and was not altered.
DKIM stands for DomainKeys Identified Mail. Your sending platform signs each message with a private key, and the matching public key is published in your DNS.
The receiving server checks the signature. If it validates, the message provably came from a sender authorised for that domain and was not modified in transit.
Along with SPF and DMARC it forms the set of records that mailbox providers now effectively require from anyone sending in volume. Missing them is one of the most common reasons a legitimate campaign lands in spam.
Related terms