The LLM equivalent is what Google does do, which is train its spam filters on the contents of your emails coupled to the signal of what human beings flag as spam.

(It was one of the first significant value-adds of GMail: at its scale, Google could create a global-concept understanding of the content and pattern of spam across hundreds of millions of users. That was the kind of Big Data that made it possible to build filters where one could confidently say "This is tuned on all spam in the wild, because we've seen all spam in the wild").