Building a Dynamic Email Personalization System with Resend, LaunchDarkly, and SQLite

In this guide, we'll build a dynamic email marketing system that personalizes emails for different user segments using Resend for sending emails, LaunchDarkly for controlling feature flags, and SQLite for storing user data. We'll learn how to use LaunchDarkly to manage feature flags and personalize email content, send customized emails at scale using Resend, pull user data from a database, and tweak our email strategy in real-time with LaunchDarkly's flexible rules. The entire project code is available on GitHub.