I have found this seemingly useful list of throwaway email services, and I want to add them to a mass ban advising users to use a permanent email address, and keep up with future additions to the list.
https://github.com/wesbos/burner-email-providers/blob/master/emails.txt
iirc
@Spuds did a similar addon, maybe he can give more information
https://addons.elkarte.net/admin/Block-Disposable-Email.html
it is this one, similar but not exactly what you are asking for, sorry :-[
Forgot about that one ... really the only downside is the 200 request limit per month, but most websites can operate under that.