I ran my own email server on my own domain for years. You're right, it's kind of its own special nightmare to integrate all the parts of a comprehensive email s

I ran my own email server on my own domain for years. You're right, it's kind of its own special nightmare to integrate all the parts of a comprehensive email system (I eventually started using Zimbra's free server software because of it), but spam effectively killed being able to self-host more. Even if you setup SPF and DKIM and all the rest, you'll find yourself getting blackholed anyway because you're NOT Google or Apple or Microsoft. It's not like I even sent email in bulk either. It was just my normal, personal account. But getting OFF blackhole lists became enough work that I had to route my mail through Gmail anyway, so I just gave up self-hosting entirely. That was, like, 7 or 8 years ago, though, so maybe things are different now, but I doubt it. I expect it to only have gotten worse.