What is DKIM?
DomainKeys Identified Mail (DKIM) lets a sending system attach a cryptographic signature to messages. Receivers look up a public key in DNS under selector._domainkey.yourdomain.
What AuthDNS checks
- DNS presence of TXT records for common selectors (google, selector1, default, and others)
- Whether records look like DKIM key material (
v=DKIM1/p=)
AuthDNS does not validate message signatures — only DNS key presence for probed selectors. You can pass custom selectors via the API.
Example draft
v=DKIM1; k=rsa; p=<your-public-key-base64>