var nodemailer = require('nodemailer');

var smtpConfig = {
    host: 'domain.com',
    port: 587,
    auth: {
        user: 'user@domain.com',
        pass: 'password'
    }
};

var transporter = nodemailer.createTransport(smtpConfig);
var mailOptions = {
    from: 'user@domain.com',
    to: 'receiver@somedomain.com',
    subject: 'Test email',
    text: 'this is some text',
    html: '<b>Hello world ✔</b>'
}

transporter.sendMail(mailOptions, function(error, info) {
    if (error) console.log(error);
    console.log(info);
});