Tuta is regularly compliant with police demands for account data, though, an important anti-feature beyond the technicalities of email encryption.
https://tuta.com/blog/transparency-report
For a few options that are less likely to do that (which isn't to say they don't have their own limitations):
https://paper.wf/downas/where-to-get-an-anticapitalist-anti-surveillance-email-address