DKIM: DomainKeys Identified Mail
DKIM adds a digital signature to each email so the receiver can check that the message came from the signing domain and was not altered on the way.
How it works
The sender signs selected headers and the body with a private key. The matching public key is published in DNS under a name that includes a "selector", which lets a domain run several keys at once.
A valid signature proves the signing domain vouches for the message. It does not say the signing domain is the same as the visible "From" domain until DMARC checks alignment.
Related LookValid products
| Product | Credits | Docs |
|---|---|---|
| Email Domain Check | 1 credit per address checked | API docs |
New to the API? Start with the quickstart or the API reference. Agents can call the same lookups through the MCP server.