Nodemailer with Gmail service not working on heroku

Question

I've got a basic email setup done for sending email using Nodemailer with AngularJS and NodeJS and I've got the project deployed on heroku.

The emailing seems to be working just fine when I am running the app on heroku, but when I get it deployed to Heroku no emails are sent.

For authenticaion I am using a gmail address and I also have a bcc to another gmail address. So from and bcc addresses are two different gmail addresses. The from address is same as the address used for authentication.

Could somebody help me with resolving this issue?

Edit: Adding code

var nodemailer = require('nodemailer');
var transporter = nodemailer.createTransport({
    service: 'Gmail',
    auth: {
        user: '[email protected]',
        pass: 'foobar'
    }
});

router.post('/send',function(req,res){

    var mailOptions = {
        from: 'Foo Bar ✔ <[email protected]>',
        to: req.body.email,
        subject: "Hello " + req.body.email,
        text: 'Hello ' + req.body.email + '✔',
        html: "<p>Hello " + req.body.email + " </p>",
        bcc: "[email protected]"
    };
    transporter.sendMail(mailOptions, function(error, info){
        if(error){
            console.log(error);
        }else{
            console.log('Message sent: ' + info.response);
            res.send(200);
        }
    });        
});

Answer 1

I believe this is issue with google account security. - Google blocked your sign in to use the mailing features due to unknown device (location).

A few step to verify this:

• Start your server locally and sends the email.

• Check your account alerts for unknown sign in.

This can be temporally resolved by: https://accounts.google.com/DisplayUnlockCaptcha

More permanent resolution would be to change your password to a stronger level:

upper case letter + lower case letter + special symbols + numbers