This feature makes it possible to manage opener impressions. You can then set up a scenario based on the opener’s behavior when they have been previously exposed to other Reelevant block(s). The scenario can adapt if the opener has already seen and/or clicked one or more blocks.
For example, if you highlight a promotional banner in an initial email that a recipient is exposed to this banner and you highlight it again 5 days later and the same recipient is exposed to it, you can decide not to display it to this particular recipient if you want to push the banner again in an email 5 days after that.