How do I implement DKIM for my domain?

To implement DKIM for your domain, you will need to generate a public/private key pair, create a DKIM record, and publish the public key in the DNS. In case of third-party Email Service Provider (ESP) usage, such as GSuite, Microsoft365, Mailgun, Klaviyo, etc., you need to obtain the public key directly from their interface/portal. The DKIM record specifies the domain and selector used for the key, as well as the parameters for the digital signature. Once the DKIM record is published, email servers can use it to verify the authenticity and integrity of emails that claim to be from your domain.