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That's not really true because they used to have the same mail server so if you found one domain, then you could easily find the rest of the domains too.

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I wouldn't call it "easily" as you need a way to reverse lookup for all MX hostnames that resolve to a given IP address. Obviously they can rotate the IP address too, to further complicate things.

They use the same IP and their domains are all listed here: https://verifymail.io/domain/carspure.com

I have to admit that they have improved though as earlier they were all using the same MX records, now at least each domain has its own.

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