Thanks for recommendation. Tutanota does seem to be highly regarded privacy wise, however they technically don’t allow multiple emails for free [just like proton mail], according to their Terms and Conditions: https://tutanota.com/terms/
4.7. Each natural person is prohibited to sign up for more than one free of charge Tutanota account for private use. For additional accounts a paid tariff must be selected which allows adding aliases and user accounts.
See my comment under this comment about Proton Mail to see why this matters. (keeping the thread a bit more DRY (Don’t repeat yourself) since I did a lot of repetitions here already).
It’s fine, whole comment section is kinda like that anyway, and + someone will probably find this recommendation useful nonetheless.