It’s not on your list but I’ve had a Mailfence email for the last couple of years and they’ve been solid.
You could also use YUNOhost to host your own on a VPS. I had no experience before setting mine up and it was fine. Unlimited email accounts and aliases out of the box, plus you can host other stuff besides, like a website, file server or even a fediverse instance.
There are probably lists you can search online but I find that adding /feed or /rss to the URL of a page I want to see updates from does the trick. There is also at least one Firefox add-on that indicates if a page has an RSS feed.