nodemailer 登录无效：535 身份验证失败

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

At the transporter options, if you use gmail at the auth, you need to add
auth: { user: 'youremail@gmail.com', pass: 'yourpassword' }
You must also know that you are the only one that can send email to other users.
When sending email at the transporter the from: process.env.EMAIL_ID can only be your email, not anyone else's.
If you use yahoo it will be a bit more tricky to send emails, because you need to add an application password in order to authenticate.

Answer 2

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.

Answer 3

I had a domain-based email address like you@yourdomain.com and I was getting this error.

Solution for me was to use

host: 'smtppro.zoho.in'

in place of

host: "smtp.zoho.com"

This is documented in this article

Also, do create an app password from this link . Full help doc

Full createTransport

let transporter = nodemailer.createTransport({
   host: 'smtppro.zoho.in',
   secure: true,
   port: 465,
   auth: {
      user: YOU@YOURDOMAIN.COM,
      pass: ZOHO_APP_PASSWORD,
   },
});