And this is one of the (many) reasons that I have self-hosted my email for the last 20 years. Sure, I have had outages, and one or two times I have had to drop everything to fix the server due to a botched upgrade. But each time this happened it was my own fault and I myself was able to fix it. I have NEVER lost access due to some automated system putting me in the wrong category.

By the way, the biggest griefs I have had with self-hosting my email has been due to Microsoft. Their way of categorizing spam can pretty much be summed up to: does it come from an explicitly whitelisted commercial email provider? Probably not spam, otherwise: spam. They are criminally incompetent (also) in this area.