I’ve been using mailbox.org for a few years now and I love it.

the web client is good, and it was easy to set up on my phone alongside my other accounts.

it costs money (something like €3/year), but it’s worth it.

plus, it’s still relatively new, so if you suffer from Generic White Guy Name™ like I do, you can finally have a username/email address that’s not full of numbers.

mailbox.org > proton mail

it’s not free, but it is secure.

the base plan is €12 (~$14 USD) /year

the Hospital Corporation of America makes $70b+ a year