Public utilities are highly regulated, and do not have the right to interrupt your service.
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'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."
It's pretty obnoxious.
1. You can't search message content. gmail is very good at this, so I've had to become more organized to make sure that I can find a particular message in protonmail.
2. Notifications on mobile do not clear if I've read the message on another device. I have to open up the app and sync to stop them from popping up with outdated information.
3. I wish that there was a way to mark a message as archived and read from the mobile notification.
Other than that, I can't complain.
(They do have Protonmail Bridge now, but it doesn't work great for alternate mobile clients unless they've changed it)