Google WNC-627102 message

I received a WNC-627102 message from Google Search Console that an unknown user has been added to https://mail.mydomain.com/. According to a Google Support thread https://support.google.com/webmasters/thread/2185736?hl=en, this indicates a case of “subdomain hijacking”. We do not use the mail subdomain and I have deleted the CNAME record for it. Is there anything else I should do to protect my domain from hijacking?

If all DNS records for the subdomain no longer exist, then there is nothing further you need to do as a subdomain cannot be hijacked if it does not exist.

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