Could someone please give us non-practitioners a practical TLDR?

Specifically, can I get this packaged somehow into a thing that I can run on my own server to classify my mail as spam or non-spam? Or at least run it as a service with an API that I can connect to?

I watch the development of those LLMs with fascination, but still wade through tons of spam on a daily basis. This should be a solved problem by now, and it would be, except I don't really want to send all my E-mails to OpenAI through their API. A local model would deal with that problem.