Well-designed email clients with proper privacy seem to be very hard to come by, and new players in that niche would be welcome. Particularly in the current climate, I would argue.
Yeah, what happened there? I had Eudora in the mid-90s running PGP integrated really nicely. I was talking with a friend how had never used PGP before and I realised somehow I just stopped using it and don't remember when. Maybe it was just the romantic ideal back then that we were important enough to have our mail read, or maybe it was that we actually personally knew the ISP admins and really knew they could read our mail.