Nodemailer, Heroku, Gmail, invalid login - works locally

Question

I have been having this issue for the past couple of weeks, it works every time locally, however once I deploy it to my heroku server, it will give me an invalid login error. I have gone into the account and givin access to less secure apps. And the credentials are correct, and it works on localhost every time. Is there something I am missing?

quickSendMail: function(routeBody, callback) {
//configuring the nodemailer for email notifications
  var smtpConfig = {
          host: 'smtp.gmail.com',
          port: 465,
          secure: true, // use SSL
          auth: {
              user: 'mysmtpemail123',
              pass: '******'
            }
        };

  var mailOptions = {
          from: 'SageStorm Site <[email protected]>',
          to: ['my email'],
          subject: routeBody.subject,
          html: 'my message'
        };

  var transporter = nodemailer.createTransport(smtpConfig);

  transporter.verify(function(error, success) {
        if (error) {
                console.log(error);
        } else {
                console.log('server is ready to send emails');
          }
        })
  transporter.sendMail(mailOptions, function(error, info) {
        if (error) {
              console.log(error);
              return callback(err, null);
        } else {
              console.log('Message sent: ' + info.response);
              return callback(null, info);
          }
        })
    }

Answer 1

You can allow machines to access your gmail remotely using this link, but keep in mind that Google will affect your default account (even if you are connected with another one).

The easy way: use a incognito / private window (to have no google account connected) and log in your google account and then use the link above.

If that doesn't work try updating your nodemailer to the latest version.