E-mail marketing, despite its challenges, remains an effective way to reach customers. One technique that provides dynamic control after sending emails involves using Redis and a Node.js server alongside regular email tools. By pointing badge image URLs and item URLs at intermediate URLs, marketers can calculate the "hotness" and popularity of items in real-time, allowing for more effective communication with customers. This technique is efficient in terms of storage space and provides rich data on customer interactions. However, it requires a chatty system with multiple moving parts and may present challenges under heavy load. Redis Enterprise can provide high-availability and clustering to mitigate these issues. The same technique can be applied to other platforms for dynamically changing images based on data changes.