nodemailer Invalid login: 535 Authentication Failed

Question

I'm trying to use nodemailer(npm package) in my node app to send email through the contact page. It is giving me this 535 Authentication Failed error while I can assure you that my email and password are absolutely correct.

var express = require('express');
var router = express.Router();
const nodemailer = require("nodemailer");
require('dotenv').config();

router.route('/')
    .post((req, res)=>{
        const emailData=req.body;
        let transporter = nodemailer.createTransport({
            host: "smtp.zoho.in",
            port: 465,
            secure: true, // true for 465, false for other ports
            auth: {
                user: process.env.EMAIL_ID, // generated ethereal user
                pass: process.env.EMAIL_PASS, // generated ethereal password
            },
            tls:{
                rejectUnauthorized: false
            }
        });
        
    let info = transporter.sendMail({
        from: process.env.EMAIL_ID, // sender address
        to: process.env.EMAIL_ID, // list of receivers
        subject: "Quengenesis: Contact Message", // Subject line
        text: `
            From: ${emailData.fName} ${emailData.lName}
            Email: ${emailData.email}
            Phone: ${emailData.phone}
            Message: ${emailData.message}`, // plain text body
        // html: "<b>Hello world?</b>", // html body
    });
    
    // console.log("Message sent: %s", info.messageId);
    // console.log("Preview URL: %s", nodemailer.getTestMessageUrl(info));
    // verify connection configuration
    transporter.verify(function(err, success) {
        if (err) {
            res.send('There is a problem in the server, please try again later '+ err);
        } 
        else {
            res.send('Your message was sent successfully');
        }
    });
    
})

module.exports = router;

Answer 1

I enabled two-factor authentication in my Zoho account and then I created a separate app password from here under the security tab then used this password for the nodemailer. It worked.