In the fast-paced world of content creation, your newsletter provides a direct line to your audience's interests. Every send offers a treasure trove of data that reveals what captivates readers and what falls flat. The vital signs of your newsletter include open rates, click-through rates, click rates, scroll depth, and time spent open. These are the key performance indicators (KPIs) of your newsletter. Track these metrics, understand what they reveal, and they'll show you ex