Here is a list of free or disposable email providers.
Data comes from these sources:
- https://github.com/aaronbassett/DisposableEmailChecker/blob/master/disposable_email_domains.txt
- https://github.com/tarr11/Webmail-Domains/blob/master/domains.txt
- https://github.com/FGRibreau/mailchecker/blob/master/list.json
- http://cpansearch.perl.org/src/TJMATHER/Email-IsFree-0.02/IsFree.pm
- http://www.joewein.de/sw/spam-freemailer.htm
- https://gist.github.com/adamloving/4677212
I have no idea what the license should be.