lora-project/server-api/libs/sendmail.js

const nodemailer = require('nodemailer');
const config = require('../config.json');
const util = require('util');

module.exports = async(toMail, template = {}, data = []) => {
    let transporter = nodemailer.createTransport({
        host: config.smtp.host,
        port: config.smtp.port,
        secure: config.smtp.secure, // secure:true for port 465, secure:false for port 587
        auth: {
            user: config.smtp.user,
            pass: config.smtp.pass
        }
    });

    // setup email data with unicode symbols
    let mailOptions = {
        from: config.smtp.sys_mail, // sender address
        to: toMail, // list of receivers
        subject: template.title || '', // Subject line
        text: template.text ? util.format(template.text, ...data) : '', // plain text body
        html: template.html ? util.format(template.html, ...data) : '' // html body
    };

    return new Promise((resolve, reject) => {
        // send mail with defined transport object
        transporter.sendMail(mailOptions, (error, info) => {
            if (error) {
                return reject(error);
            }
            // console.log('Mepassage %s sent: %s', info.messageId, info.response);
            return resolve(info);
        });
    });
}