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Incorrect, I tried sending a mail and it bounced.

It is a valid email if the owner of the me tld sets up an email address on it. I'm not sure if anyone has done it on a tld but I have seen websites which are on the tld with no sub domain.

> I have seen websites which are on the tld with no sub domain.

Do you have any example of that?

http://ai./

It should only be possible on ccTLDs, this is not possible on newer gTLDs due to ICANN rules and I think no classic gTLD has it.

See: https://stackoverflow.com/a/40358071/4418149

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