//contact.js

router.post('/contact', function(req, res) {
  [...]
  var smtpTransport = nodemailer.createTransport({
                      host: 'smtp.gmail.com',
                      port: 465,
                      secure: true,
                      auth: {
                            user: process.env.NODEMAILER_USER,
                            pass: process.env.NODEMAILER_PASS
                            }

                      });
 [...]

});

2017-08-17T03:48:46.321062+00:00 app[web.1]: { Error: Invalid login: 534-5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbvZ
2017-08-17T03:48:46.321074+00:00 app[web.1]: 534-5.7.14 EZW-kKmhYqkWtDpmsdSWhbsGC9g2wMCfElnCEVSmzE96E781VHIUDvPoG9-iYnhZbYWVjJ
2017-08-17T03:48:46.321075+00:00 app[web.1]: 534-5.7.14 wSXaAODgZbdxiLRBe11EK8BzaYuLktLXla92mLjzhYDqKNCPsZdWGSVaOYn59xkH7zgAdz
2017-08-17T03:48:46.321076+00:00 app[web.1]: 534-5.7.14 J5HZ1lhN0p2-iy31bYV1nDHurHEsUpnig_4ZXdYLgldRgSbgCQMrLtgBL1Gt3ulMTPNCZW
2017-08-17T03:48:46.321077+00:00 app[web.1]: 534-5.7.14 URDn70hKo_jpnGMmwZRPFfZVrmiM8> Please log in via your web browser and
2017-08-17T03:48:46.321078+00:00 app[web.1]: 534-5.7.14 then try again.