You start with the premise that you can't host your own email, which is problematic. I don't know why the people who fail at self-hosting email are so adamant about telling others that nobody should self-host, but it seems more like a squeaky wheel problem than a real one.

In every scenario, deliverability problems can be solved by smarthosting through a reputable email provider. Period.

You get all the benefits of your own filtering, your own logs showing every delivery attempt, you get to store your data on your own systems, access it however you prefer, et cetera - all the reasons to self-host are there except for delivery logs, and those can be arranged through your smarthost provider.

Simple, huh? So why are so many people emphatically telling us to NOT self-host email?