Event-Driven Email Microservice with NestJS and Twilio SendGrid

In an effort to create a scalable and maintainable email microservice, this guide outlines the process of building an event-driven email system using NestJS and Twilio SendGrid. The approach involves mapping internal application events to SendGrid templates, enabling dynamic email triggers, and configuring webhooks to monitor email delivery, opens, and bounces in real-time. The tutorial begins with setting up the NestJS project and installing necessary dependencies, followed by creating an email module to handle transactional emails. It introduces an event system to manage and dispatch events without directly integrating email logic with business logic. Additionally, it explains how to set up a webhook listener for SendGrid events, testing the setup locally with Ngrok, and troubleshooting common issues like email delivery failures. The guide emphasizes the importance of monitoring email infrastructure to avoid issues like spamming while encouraging further exploration of advanced email flows and SendGrid's documentation for improved email handling and delivery optimization.