Our engagement programs are based off assets. Most of our leads enter the engagement programs by reviewing one of our assets. Therefore, I want to ensure when they are receiving nurture emails from us, they are only receiving new and fresh content - not content they have already read. What is the best way to do this? I've created a smart list in the Send Campaign for our white paper asset (pictured below). What I'm hoping this gets across is, that if the lead has filled out a any form related to that particular asset, they will not receive the nurturing email related to the asset. Is this the right way to go about it? Thanks!