Every SaaS app in the world sends out welcome emails. Some are awesome, some are
not. Last spring we reached the point where we could no longer manually send
customized welcome emails. However, we really didn't like the idea of sending
the same bland generic email to all of our new users. We have three distinct
user types (engineering, marketing, and sales), and using the same language and
call to action seemed like such a waste.

Luckily we found a solution in our own data. We built a relativel