Set up the nodeMailer route and the transporter

routes/nodeMailer.js

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+const express = require('express');
+const transporter = require('../transporter');
+// TODO: add verifyToken
+
+const emailRouter = express();
+
+emailRouter.use(express.json());
+
+emailRouter.post('/send', (req, res) => {
+  const { email, messageHtml, subject } = req.body;
+  const mail = {
+    from: `${process.env.REACT_APP_EMAIL_FIRST_NAME} ${process.env.REACT_APP_EMAIL_LAST_NAME} ${process.env.REACT_APP_EMAIL_USERNAME}`,
+    to: email,
+    subject,
+    html: messageHtml,
+  };
+
+  transporter.sendMail(mail, (err) => {
+    if (err) {
+      res.status(500).send(`Transporter Error: ${err}`);
+    } else {
+      res.status(200).send('Transporter Backend Successfully Sent');
+    }
+  });
+});
+
+module.exports = emailRouter;

transporter.js

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+const nodemailer = require('nodemailer');
+
+require('dotenv').config();
+
+// sender information
+const transport = {
+  host: 'smtp.gmail.com', // e.g. smtp.gmail.com
+  auth: {
+    user: process.env.REACT_APP_EMAIL_USERNAME,
+    pass: process.env.REACT_APP_EMAIL_PASSWORD,
+  },
+  from: process.env.REACT_APP_EMAIL_USERNAME,
+  secure: true,
+};
+
+const transporter = nodemailer.createTransport(transport);
+
+module.exports = transporter;