That doesn’t work well when you actually do need to receive emails from them once in a while.

Equifax abuses this to the extreme, with every single change to your credit usage triggering an “account related” alert. But you still need to allow them for that one time they actually send a useful alert.

It seems like we have all the tools we need to filter email with classification by language models.

And what masked emails are for. I use this with fastmail and my own domain, it’s amazing.