Buiding an email formatting and validation software in php

I am a software developer(PHP) and I have had to build some application which deals with users data and a major issue for me was emails validation and format like typos and so on.

I want to know how I can build an email cleaner and validation software, that can format the email as well as clean it, I want it to be an opensource software where people can upload their data and it gets cleaned and filtered.

I know there are some big guys that already do this, guys like; Mailchimp, Sendgrid and so on at a cost but I would like to build something like this and let everyone benefit from it. I would be able to cover the server cost to an extent.

I would really appreciate it if I could get the steps to follow in order to achieve this with PHP. e.g

1. $email = "john.doe@domain.com";

// Remove all illegal characters from email

$email = filter_var($email, FILTER_SANITIZE_EMAIL);

2. .....

Thank You in advance.