A good email service is one that you own and control with no influence from others. If you have a domain and an IP address, get a desktop computer and install Server software and email software, YOU OWN IT and Nobody can do anything because it is Your Email service now.
There are others doing that service for a fee, and I would not have to do many things myself to avail myself of their service other than pay a small fee; some even give encrypted Email service. I feel I don’t need to manage all the other business of doing it all myself. POP service provides what I need as far as my Emails not residing for very long on an outside service providers servers and with them always deleted from their servers as I bring/get the Email into my own PC equipment. I think that is as good as I need and less work for me.