this is where LLMs could actually help. create spam filters that an LLM can parse and deny if it looks close enough. but then again, hallucinations would be kind of terrible.

I agree this would be a good use of an LLM (assuming that it was running locally). I wouldn't put one in charge of deleting my messages, but I could see one being used to assign a score to messages and based on that score moving them out of my inbox into various folders for review.

Same can be achieved with a catch all domain and a sub for every service you use. Cost $13/year. Extra protection: now if you lose access to your email provider, you still have access to future emails.