mailer.js

const nodemailer = require("nodemailer");

// create reusable transporter object using the default SMTP transport
var mailConfig;
mailConfig = {
	host: process.env.EMAIL_SMTP_HOST,
	port: process.env.EMAIL_SMTP_PORT,
	secure: process.env.EMAIL_SMTP_SECURE, // lack of ssl commented this. You can uncomment it.
	auth: {
		user: process.env.EMAIL_SMTP_USERNAME,
		pass: process.env.EMAIL_SMTP_PASSWORD
	}
};
let transporter = nodemailer.createTransport(mailConfig);

exports.send = async function (from, to, subject, html)
{
	// send mail with defined transport object
	// visit https://nodemailer.com/ for more options

	var mailOptions = {
		from: from, // sender address e.g. <foo@example.com>
		to: to, // list of receivers e.g. bar@example.com, baz@example.com
		subject: subject, // Subject line e.g. 'Hello ✔'
		//text: text, // plain text body e.g. Hello world?
		html: html // html body e.g. '<b>Hello world?</b>'
	};

	let email = await transporter.sendMail(mailOptions);

	console.log("email id sent: %s", email.messageId);
	console.log("email sent: %s", email);
	console.log("email response sent: %s", email.response);
};