What I'm saying is that it should be able to interact with all the email services out there, not rely on a single 3rd party service for the functionality. Sure

What I'm saying is that it should be able to interact with all the email services out there, not rely on a single 3rd party service for the functionality. Sure, for the demo they can choose postmark as a mockup server. But he should keep in mind that postmark is not a hard requirement, eventually they need to switch to something more controllable/cost effective. Failing to knowledge that is already a considered failure.