Certificate Authority Authorization (CAA) - Let's Encrypt
CAA is a type of DNS record that allows site owners to specify which Certificate Authorities (CAs) are allowed to issue certificates containing their domain names. It was first standardized in 2013, and the version we use today was standardized in 2019 by RFC 8659 and RFC 8657. By default, every public CA is allowed to issue certificates for any domain name in the public DNS, provided they validate control of that domain name.| letsencrypt.org
