CAAレコード
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CAA（Certificate Authority Authorization）レコードは、ドメインに対して[[ssl-tls|SSL/TLS証明書]]を発行できる認証局（CA）を指定する[[dns|DNS]]レコードです。CAAレコードは不正な証明書の発行を防ぎます。
使用例
A CAA record 'example.com. IN CAA 0 issue "letsencrypt.org"' means only Let's Encrypt can issue certificates for example.com.