For the price of a cheap VPS and a couple of hours setup you could run YUNOhost, which comes with email set up out of the box. It integrates perfectly with Thunderbird on desktop and android and you can install other cool stuff on it as well.
Installation is a bit more involved than signing up with a commercial email provider but I thought I’d mention it. I had no previous experience of server admin and was able to get it set up and my server is still going strong after nearly three years.



I use Jami and Session. Interested to check out SimpleX Chat though.