What an email permutator does
Most companies build email addresses from a fixed rule: first name and last name joined by a dot, the first initial followed by the surname, and so on. An email permutator applies every one of those rules to a person’s name and the company’s domain, so you get the full list of addresses the person could have.
It narrows the search from “[email protected]” to a short list. What it cannot do is tell you which one is real — that takes a verification step, which is where a contact-data tool comes in.