Check if email exist php

Question

I have a question, i have a php script to check if the email address exist.

But appear that yahoo, hotmail, aol and others providers are accepting any emails and not

Answer 1

If you need to make super sure that an E-Mail address exists, send an E-Mail to it. It should contain a link with a random ID. Only when that link is clicked, and contains the correct random ID, the user's account is activated (or ad published, or order sent, or whatever it is that you are doing).

This is the only reliable way to verify the existence of an E-Mail address, and to make sure that the person filling in the form has access to it.