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Nodemailer in Javascript with SMTP connection to Email Pro Email - Not Working


Hello there,

I am currently attempting to use Nodemailer in my Express.js server to send emails but it doesn’t seem to work for me. I have used the verify function from Nodemailer to check if the connection via SMTP was successful and this is returned from the request:

    "code": "EAUTH",
    "response": "535 5.7.1 Authentication failed",
    "responseCode": 535,
    "command": "AUTH PLAIN"

Here is the code in Javascript I am using to send an email with Nodemailer with my custom domain:

app.get('/mail/verify', (req, res) => {
    var transporter = nodemailer.createTransport({
        host: process.env.MAIL_HOST,
        port: process.env.MAIL_PORT,
        secure: process.env.MAIL_SECURE,
        auth: {
            user: process.env.MAIL_USER,
            pass: process.env.MAIL_PASS
        tls: {
            rejectUnauthorized: false

    transporter.verify((err, success) => {
        if (err) {
        } else {
            res.send('Server is ready to take our messages!');

These are the .env variables I am using:

MAIL_PASS = 'password'

If I replace ‘’ with the server of my Email Pro, I get a ETIMEOUT error. Does anyone know what may be causing this and what I can do to make this work?

Thank you for taking the time to read this and I look forward to any responses!