Email is a clear text protocol by design. Not that there is something bad in it (to me focing encryption everywhere doesn't make that much sense, and for most u

Email is a clear text protocol by design. Not that there is something bad in it (to me focing encryption everywhere doesn't make that much sense, and for most uses of email, you don't need that level of security), but you need to always keep that in mind. For that reason, every server that claims to offer some end to end encrypted email service is bullshit, since somewhere the mail must be decrypted to be sent out to other servers (except if you exchange mails with users of the same service, that is extremely unlikely). In my opinion, the best thing to do is to host your own mail server. For a person with a moderate knowledge of Linux it's not that difficult to install, the most difficult thing is to configure the server and the DNS correctly with all the record required to not be considered spam, and you have full control of your mail. Yes, your mail of course are still going out in plain text when you send them to other servers (of course these days the communicatoin is TLS encrypted, but still they can be intercepted by controlling the destination server), but otherwise the messages are on your server, that can be a physical machine with encrypted disks if you want it to (I don't care that much and I have my server on AWS).