Setting up domain keys involves creating specific DNS records for SPF, DKIM, and DMARC in your domain's DNS settings. For SPF, you need to add a TXT record that specifies the email servers allowed to send emails on behalf of your domain. DKIM requires generating a pair of keys and publishing the public key in your DNS records. For DMARC, you need to publish a DNS TXT record that defines your policy and how you want unauthorized emails to be handled. Itâs advisable to consult your email service provider for precise instructions tailored to their systems.