> with one exception- my city's utilities company blacklists protonmail
Why do they do this? Did you contact them about it? I would say it seems, at face value, that your city's utilities company did not serve you while Protonmail did.
> that your city's utilities company did not serve you while Protonmail did.
That's fair- that's a better way of saying it. Every time I've had to email them (which admittedly has only been a handful of times) with proof of something, I always end up calling them up and they'll say "but protonmail isn't on the blacklist that IT posted, so you're lying or you sent it to the wrong place," then I'll send screenshots from a different email provider proving that I sent the protonmail email(s) to the right place, then they'll say "oh, I promise to talk to IT to get this straightened out."
Why do they do this? Did you contact them about it? I would say it seems, at face value, that your city's utilities company did not serve you while Protonmail did.