I think this is standard. It applies to domains as well. I experienced government services blocks as well -- they send me an email, yet block my reply. I complain every time and rarely does anyone care, the support person does not escalate, so my email remains blocked, sometimes I'm told system is working as configured, completely ignoring that I am a real person and system is hostile towards me.

It's just general fragility of tech and lack of care from the creators/maintainers. These systems are steampunk, fragile contraptions that no one cares to actually make human friendly or are built on crappy foundations.

We call it the email mafia.

To send emails we need to pay for a mail service. Or get ads of course Gmail is part of the ring.

Like most things it start with good intentions, to fight spam. As if it even worked, I guess we would get far more without they will say.

Is there a government requirement to be reachable by its citizens? That would seem to violate it.