You could use some containerized mail server like Mailcow. They’re pretty alright to set up and should work fine for low volume. At least in my experience. Unless you don’t want to deal with mail yourself, then you should maybe consider a paid service. But I don’t have any experience with those.
I don’t think the app in the picture is driven by AI. Seems like a catalogue of questions. Probably to assess some situation by some standard procedure. I’d trust that. Regarding the AI apps mentioned below: I wouldn’t trust them at all. If my private parts start itching and I can’t make sense of it, I’d go to the doctor. At least if it’s serious. Or use Dr. Google if it’s not too bad.