I've been using Mailfence since it's built in to Thunderbird and seem trustworhy. Even their support team communicated only via PGP, which is sadly a fun and no

I've been using Mailfence since it's built in to Thunderbird and seem trustworhy. Even their support team communicated only via PGP, which is sadly a fun and novel experience in 2022. I think you have to pay for IMAP/POP/etc support though.