nodemailer error: self signed certificate in certificate chain

I googled this but could not find an answer for my problem. here is my code

var xoauth2 = require('xoauth2');

var transporter = nodemailer.createTransport({
  service: "Gmail",
  auth: {
    xoauth2: xoauth2.createXOAuth2Generator({
      user: "[email protected]", 
      clientId: "-",
      clientSecret: "-",
      refreshToken: "-"
       })
  }
});

app.post('/send', function (req, res) {
  var mailOptions = {
      from: 'dude',
      to: '[email protected]',
      subject: 'Email Example',
      text: 'username: ' + req.body.firstname,
      attachments:[
        {
          filename: req.files.myfile.name,
          content: new Buffer(req.files.myfile.data,'utf-8')
        }
      ]
  };

  transporter.sendMail(mailOptions, function(error, info){
    if(error){
      console.log(error);
      res.send(error);
    } else {
      console.log('Message sent!!');
      res.send('sent');
    }
  });
});

i used to have this problem back when i did not use oauth2, now that im using it i thought it would go away but it didnt. what am I doing wrong here?

Answers:

Answer

Ok so it was because of the Anti-Virus software. i swear things like this make me feel like quitting.

Answer

Same was with me. My antivirus is AVG. Instead of turning the antivirus off in AVG you can go to Settings>Components>Email Shield>Customize>SSL Scanning and uncheck "Scan SSL connections".

In Avast Go Settings/Protection/Core Shields/Configure shield settings/Mail Shield and uncheck "Scan outbound emails (SMTP)"

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