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A comment on GitHub Pages generated a TLS cert for my own domain. Parent comment

Re:GitHub Pages generated a TLS cert for my own domain by web007 on Wednesday April 18, 2018 @11:47AM (#16868299)
If your DNS host supports it (Route53 does), you can set a wildcard CAA record with no valid issuers that will do what you want.

Bare -> LE delegation WWW -> explicit LE delegation * -> no delegations, and will override "bare" since resolution walks up the domain tree.

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