I haven't found an email service that does. Before people recommend Protonmail, Tuta, Startmail: They offer only paypal or credit card at sign-up. I tried to pay for email without doxing myself earlier today and these services don't allow that. I have found a VPN and that is Mullvad. You get a number and they don't care who pays as long as the payment is made the VPN service will be provided to the account associated with the number and the payment. Any others that implement orange checks to prevent spam (or be glad to get it because it means they get paid.) and pay for their services?