This is a process described by Seth Godin known as permission marketing. The core concept of this idea is that you never market to someone that doesn’t want it, you first have to ask them for their permission. When someone signs up to your email not only do they become a warm lead but they give you their permission to send them offers and to market to them.
Julie Ewald recommends moving away from sending generic content to your whole email list via e-blast entirely. With a little elbow grease, you can utilize segmentation and start sending off tailored messages to each of your lists with content that’s relevant, valuable, and designed to resonate with the kind of recipients that make up each segment.