Check out
this article that details how this Minneapolis startup is changing the way customers think about direct mail. To summarize, the company's name is Inkit and they supply:
"...a programmatic direct mail solution that automatically generates direct mail pieces based on a trigger or action determined by the customer. Say the marketer wants the system to be triggered when one of its customers unsubscribes from its email list or goes inactive on day 30. When the trigger occurs, the system automatically generates a personalized mailer that is put into the queue the same day."