Open Rate

Open rate is the percentage of delivered emails that register at least one open event. It can indicate subject line and sender recognition performance, but it has measurement limits due to privacy features and image-loading behavior. Teams should use open rate as a directional signal, not a standalone success metric. Practical analysis compares opens by segment, send time, and campaign type, then validates conclusions with click and conversion outcomes. A common mistake is optimizing for opens alone, which may increase curiosity clicks without improving downstream business results.