> I run my own mail server but my VPS provider could be coerced to yank it from me.
I've got two comments on this.
Firstly, you're already doing much better than most people. Make frequent backups, and if it comes down to it, you can always point DNS at a new provider.
Second, don't put anything on a VPS that you aren't willing to let the VPS provider or whatever Gov. has jurisdiction access. Where email falls on that spectrum for you is of course your own decision.
There is one more solution. Use a VPS only as an endpoint bastion server. Keep the data and services in your own home server. We need not trust the VPS provider this way. And we can easily recover as long as the domain name and the home server are under your control.
An idea I've been mulling is getting a baremetal server from Exoscale (based in Switzerland) and running a mailserver on it. Haven't done it yet for many reasons, least of which is laziness...and I want to try and create a JMAP server with an IMAP bridge but that's another story.
I've got two comments on this.
Firstly, you're already doing much better than most people. Make frequent backups, and if it comes down to it, you can always point DNS at a new provider.
Second, don't put anything on a VPS that you aren't willing to let the VPS provider or whatever Gov. has jurisdiction access. Where email falls on that spectrum for you is of course your own decision.