

Many email providers blacklist large parts of the internet for spam protection. When I switched from hosting my own email (doing SPF, or whatever existed back then) to paying fastmail to host my email a lot more email started going through. fastmail is large enough and has a good enough reputation that nobody can afford to block emails from them. I still have my own personal domain most people who email me have no clue that I’m not hosting it. I’d advise the same thing, pay fastmail to host your email, it doesn’t cost much and everything works.
There are companies other than fastmail that does this as well. Some of them are just as good, pick whichever you want.
That doesn’t change anything useful. There are many not for profit health insurance companies in the us - they are no cheaper and don’t have better service than the for profit ones.