Defining a problem when it isn't always apparent is tough. In postmark's case, i bet a lot of their potential customers don't realize their emails are going to

Defining a problem when it isn't always apparent is tough. In postmark's case, i bet a lot of their potential customers don't realize their emails are going to spam, or they aren't reaching the customer inbox, or that they could be OPTIMIZING and generating more revenue from those emails they are already sending.