DKIM Email Authentication

DKIM Selectors

What is a DKIM selectors ?

When trying to verify a DKIM record check – it will automatically ask for the DKIM selectors. In this article, we’ll explain what are DKIM selectors.

What is DKIM?

DKIM is an email authentication technique which organizations use to protect their email. Find more information about what is DKIM? on our website.

What is a DKIM selector?

A DKIM selector is part of the DKIM record and it allows publishing multiple DKIM keys on your domain.

When creating a DKIM signature for an email, you will need to mention which private key to use. This key is totally bound to a certain selector. The associated public key is published in the DNS on a ‘subdomain’ which also contains this selector:
selector._domainkey.yourdomain.com

Check your DKIM Records and Why One should not avoid DKIM, Know more

So a selector can be re-used across domains, but a specific domain can only publish 1 public key on a specific selector. Their names are arbitrary: can indicate server locations, signing dates or individual source names.

Use multiple selectors to set up multiple vendors using DKIM or allow key rotation for a specific vendor.

Once the selector and the associated domain are in place, they will need to be validated. The DKIM Record Check of DMARC Analyzer shows if there is a valid or invalid DKIM key record.