You can create anonymous accounts with Tuta through Tor and they don't ask for a phone number or contact email address. They even made a tutorial video on YouTube a few weeks ago for how to do it: https://youtu.be/oXv3llPIfvo
If you continued using the account only through Tor, there wouldn't be any traceable info.
If you continued using the account only through Tor, there wouldn't be any traceable info.