If you pay Proton Mail for a service, they may hand over the payment data in response to a court order: https://www.404media.co/proton-mail-helped-fbi-unmask-anonymous-stop-cop-city-protestor/
Proton Mail Helped FBI Unmask Anonymous ‘Stop Cop City’ Protester

A court record reviewed by 404 Media shows privacy-focused email provider Proton Mail handed over payment data related to a Stop Cop City email account to the Swiss government, which handed it to the FBI.

404 Media

@evacide

You can actually pay Posteo in cash by mail: send banknotes in an envelope with a code to Posteo.

@Tutanota as alternative does not offer direct cash payment, but you can buy Tuta gift cards cash same way via the reseller Proxystore.

@protonprivacy also accepts cash payments according to their support, by sending physical money via post. You get the details by contacting Proton support…

But if you pay with a Creditcard, you have an US provider an board

@doodee thanks for the tips 🙌
@hlrx Also worth adding: for the IP address side of things, Mullvad VPN is a great match — you can even pay cash by mail, no account needed. Keeps the whole setup nicely anonymous if you have to.

@doodee imho mullvad immediately feels more anonymous by how the whole account system works

@hlrx