If you want the cheapest, no frills, secure (read their security policy) email host with calendar, contacts, tasks via caldav/cardav sync (thunderbird) then Purelymail is a great option. I have used them for years, no down times, great support, bring your own domain if you like. The only downside for some, it is based in the US. I am willing to overlook the US for a host that is $10 a year (can’t afford the others.)
If you worried about security, I would start thinking about transitioning off of Apple/MacOS and try out linux. Linux can run on your Apple computer. I assume you probably have an iPhone. I would suggest getting an Android phone (Pixels are great) and downloading an Android Privacy supported rom, like CalyxOS, which is de-googled completely, highly secure. There is also GrapheneOS and others, which support more phone manufacturers.
I watched the first two seasons, glad I stopped. Sounds like it went down hill and lost its magic. Tragic.