Building an Email Scheduler with Vercel Functions and QStash

The article provides a detailed guide on building an email scheduler using QStash, a serverless queuing service from Upstash, integrated with a Next.js application deployed on Vercel. It emphasizes the benefits of serverless systems, like their ease of initiation, while also acknowledging challenges such as managing stateless functions. It explains how QStash addresses these challenges by offering a pay-as-you-go model and features like delivery to HTTP endpoints and deduplication. The tutorial walks through setting up a Next.js app, installing necessary dependencies like nodemailer, and creating API routes for scheduling and notifying, ensuring secure communication through signature verification. It also covers pushing the code to GitHub, creating a Vercel project, and testing the app using cURL, highlighting the seamless integration of these technologies to create efficient serverless applications.