​
Prerequisites

To get the most out of this guide, you’ll need to:

​
1. Install

Install the NextAuth package. 
npm install next-auth
Then, install the Nodemailer package. 
npm install nodemailer

​
2. Configure SMTP credentials

Add your Resend SMTP crendentials in your application’s .env file:
.env
EMAIL_SERVER_USER=resend
EMAIL_SERVER_PASSWORD=YOUR_API_KEY
EMAIL_SERVER_HOST=smtp.resend.com
EMAIL_SERVER_PORT=465
EMAIL_FROM=onboarding@resend.dev

​
3. Configure Email Provider

Finally, in your […nextauth].js file (typically located in pages/api/auth), configure the Email provider with your SMTP settings:
index.ts
import NextAuth from 'next-auth';
import EmailProvider from 'next-auth/providers/email';
import nodemailer from 'nodemailer';

export default NextAuth({
  providers: [
    EmailProvider({
      server: {
        host: process.env.EMAIL_SERVER_HOST,
        port: process.env.EMAIL_SERVER_PORT,
        auth: {
          user: process.env.EMAIL_SERVER_USER,
          pass: process.env.EMAIL_SERVER_PASSWORD,
        },
      },
      from: process.env.EMAIL_FROM,
    }),
    // ... other providers as needed
  ],
  // ... any other NextAuth.js configs
});