*With ‘better’ I mean that an encrypted solution is adequate in these cases because the mails are on other servers, and the companies/servers depend on the jurisdiction where they are located. But by hosting a mail server at home, even unencrypted, we are 100% in control of our data.
PS: is there a self-hosting mail server solution that stores everything encrypted? I already self-host almost everything I use, but not email.
One thing you’ll find about self-hosting is that you find yourself on the other side of the spam shield very often, and getting your server to a point where other servers won’t block or filter you can be a challenge, especially if your IP or domain is on more aggressive lists like Spamhaus.
Besides that it’s not really that much different from hosting another Federated service, which you seem to have experience with.