What will impresses advertisers these days? It's not your giant on-air or online audience. It's the size of your email list. In this episode, Corey & Gordon take a look at phenomenal progress some media companies have made in building up email relationships, and they suggest a lofty goal for those trying to prepare for the transition to 1st-party data sets. The show features an interview with email expert Creighton Green, co-founder of Audience.io.