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So, I have a question: Would the following be safe? Specifically the "* CNAME @" rule.

https://gist.github.com/dav-/eaa487032588efc0b4a3

I'm fairly certain that is fine, it's not "on the root" because it's *.root.com not root.com, you have an A record on the root which is expected and correct.

Right, thanks. I'm always paranoid that I may be missing emails.

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