You can do most of that without any fancy AI or machine learning: Since you already have your own domain, setup some mail redirects and filter all mails going into them into subfolders. I have a redirect for onlineshopping where all those order confirmation and delivery informations and unwanted newsletters go. I have another I use for creating accounts - all 2FA etc. are going there. And then I have the main mail for actual communication and another redirect for all those interesting substack newsletters and so on.