const gmailSMTP = {
    "service": "Gmail",
    "username": "usersdn@gmail.com",
    "password": "22342@test",
    "emailTo": "test.sdn@gmail.com"
};

var nodemailer = require('nodemailer');
var transporter = nodemailer.createTransport({
    service: gmailSMTP.service,
    auth: {
        user: gmailSMTP.username,
        pass: gmailSMTP.password
    },
    tls: {
        rejectUnauthorized: false
    }
});

var inputData = {
    name: "xyz",
    email: "xyz@yopnail.com",
    subject: 'Welcome to Technowings',
    message: "Hello, Explore the techie inside you"
}
var mailOptions = {
    from: '"' + inputData.name + '" < ' + inputData.email + '>',
    to: gmailSMTP.emailTo,
    subject: inputData.subject,
    html: inputData.message
};