I've recently converted to Fastmail.fm, which seems great and they have a nice web interface too. They're now owned by Opera, so I assume their data retention p

I've recently converted to Fastmail.fm, which seems great and they have a nice web interface too. They're now owned by Opera, so I assume their data retention policies must be consistent with EU law, though I think they have servers based in the US so I'm not sure what that means in practice. What I'd like is a service that kept my emails encrypted on-disk with my user password. Not because I think emails are private -- they're not in the sense that I fully expect someone could intercept them in transit, even if that would be illegal -- but just because it would give reassurances that my emails can't be data-mined for advertising purposes à la gmail, or if the mailserver had a major security vulnerability, a hacker couldn't copy all my emails wholesale. But I don't know of any service that provides this, nor of a way to do it myself easily (any mailserver I set up myself would probably have far more vulnerabilities than one I rent from someone else!).