Any thought of having an email queue or "spooling" in CI4?

I've built these into almost every project I've worked on and with the advent of transnational email services I wonder if they've served their purpose. We no longer throttle sending an only use our queue to track and delay messages.

https://postmarkapp.com/ with sender signatures is amazing and worth every penny. We use their web hooks to catch bounces and read receipts so we can notify our users when both occur.