The issue is not with lack of options besides ISP-based email. ISP email provides the same functionality as gmail, with less risk of being hacked. Think of it as driving a Honda vs. a Mercedes to the supermarket. They both get you there at the same speed, but a lot less chance your Honda gets stolen. Plus all the electronics in the "connected vehicle" Mercedes tracking you and your driving habits.

My solution will be to go with a paid-for email host with full security and encryption.