How to Send Emails in Vercel Next.js App using Nodemailer and SMTP

A guide explains how to send transactional emails from a Next.js application deployed on Vercel using either Mailtrap’s native email API integration or Nodemailer with manually configured Mailtrap SMTP credentials. It requires supported Next.js, Node.js, and Nodemailer versions, a Vercel account, a verified Mailtrap sending domain, and a Git-based deployment workflow. The API approach uses Mailtrap’s Vercel integration to configure environment variables and an API route that sends messages through the Mailtrap SDK, while the SMTP approach creates a Nodemailer transporter in a Next.js API route using securely stored SMTP credentials. Client-side components trigger POST requests to these routes, allowing users to send plain-text or HTML emails, upload attachments through multipart form data, and send messages to multiple comma-separated recipients. The application can be tested locally, pushed to GitHub, and imported into Vercel, where API routes become scalable Vercel Functions and deployments update automatically after repository changes.

Use this post, company, and trend context to find content marketing opportunities, perform competitive analysis, or address product feature gaps via the Plushcap MCP server or the Plushcap API.