Lists of email providers that are either free providers like gmail or often used as disposable email addresses.
free-emails.txt
is a list of domains of free email providers, from
tbrianjones's Gist
A list of burner email addresses, which is the origin of this repo: https://github.com/wesbos/burner-email-providers
Check it out, it also offers some handy API's and libraries for email validation.