Nodemailer with cors not working

index.js

const express = require('express')
const bodyParser = require('body-parser')
const cors = require('cors')
const app = express()
const nodemailer = require('nodemailer')

const port = 8000

app.use(bodyParser.json())

app.options('*', cors())

const transporter = nodemailer.createTransport({
  service: 'gmail',
  auth: {
    user: 'EMAIL_HERE',
    pass: 'PASSWORD_HERE'
  }
})

let mailOptions

app.post('/api/1/email-alert/wish-comment/', (req, res) => {
  const data = req.body
  mailOptions = {
    from: 'EMAIL_HERE',
    to: data.emailTo,
    subject: data.wishTitle,
    html: `<h1>New comment on ${data.wishTitle}</h1>
    <p>${data.message}</p>`
  }
  transporter.sendMail(mailOptions, function(err, info) {
    if (err) res.send(err)
    else res.send(info)
  })
})

app.listen(port, () => console.log(`Example app listening on port ${port}!`))

Replace the line 23 : app.post('/api/1/email-alert/wish-comment/', (req, res) => {

By : app.post('/api/1/email-alert/wish-comment/', cors(), (req, res) => {