If anyone is reacting to my emails, I'm not seeing it, might be some vendor-specific thing. Which is fine, I don't want that.

What I really want is for unauthenticated senders to be reliably blocked. Even Gmail/Gsuite will allow spoofed emails from the same domain, though it may flag them as spam. I get that there are special circumstances where a legitimate sender can't authenticate itself, but that's their problem.