The problem is that you need a lot more volume to be able to use the feedback loop mechanisms ( https://blog.returnpath.com/what-is-a-feedback-loop/ ) efficiently.
Sure, it all works, but it's still the old piece of shit SMTP wild wild west, because when it stops working, you can do nothing. (But usually going to the saloon, having a rough night and waiting will solve things.)
The problem is that you need a lot more volume to be able to use the feedback loop mechanisms ( https://blog.returnpath.com/what-is-a-feedback-loop/ ) efficiently.
Sure, it all works, but it's still the old piece of shit SMTP wild wild west, because when it stops working, you can do nothing. (But usually going to the saloon, having a rough night and waiting will solve things.)