Again, not knowing your whole business model. But, supporting software you created is much different than supporting all the headaches/overhead of a mail serve

Again, not knowing your whole business model. But, supporting software you created is much different than supporting all the headaches/overhead of a mail server. If you want to do this, I would look at a formal resale agreement with a place like Mailstreet (not I heartily do NOT recommend them, but their name popped (haha, get it, popped...) into my head as an example). Use the benefit of THEIR support department and setup instructions when possible. You could also run your own mail server (what I do/did), then you have full control of uptime/downtime, version upgrades, etc. But still, I don't think this alone is much of a business you want to be in.