The WhoAPI API endpoint is located at https://whoapi.com/page/api. You can find the WhoAPI API portal / hompage here. The WhoAPI API is not currently available on the RapidAPI marketplace.
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Checks for fake DNS as well as uses regex functions to check the email for the right length and accepted characters. For example it will mark as valid an email like '[email protected]' but it will recognize as a fake '[email protected]' (because of the not existing domain)