有时候，我们开发邮箱验证和密码找回功能时，需要系统自动向用户的注册邮箱发送邮件，本文阐述nodejs的javascript编程如何实现自动发送email。

var nodemailer = require('nodemailer');

// create reusable transporter object using SMTP transport
var smtpTransport = nodemailer.createTransport("SMTP", {
	host: "smtp.126.com", // hostname
	secureConnection: true, // use SSL
	port: 465,
	auth: {
		user: "name@126.com",
		pass: "这里用客户端授权码"
	}
});

// NB! No need to recreate the transporter object. You can use
// the same transporter object for all e-mails

// setup e-mail data with unicode symbols
var mailOptions = {
	from: 'name ✔ <name@126.com>', // sender address
	to: 'receiver@126.com', // list of receivers
	subject: 'Hello ✔', // Subject line
	text: 'Hello world ✔', // plaintext body
	html: '<b>Hello world ✔</b>' // html body
};

// send mail with defined transport object
smtpTransport.sendMail(mailOptions, function(error, info) {
	if (error) {
		console.log(error);
	} else {
		console.log('Message sent: ' + info.response);
	}
	// if you don't want to use this transport object anymore, uncomment following line
	//smtpTransport.close(); // shut down the connection pool, no more messages
});

如果是使用QQ的smtp服务，

var smtpTransport = nodemailer.createTransport("SMTP",{
    service: "QQ",
    auth: {
        user: "mail.@QQ.com",
        pass: "QQ邮箱独立密码"
    }
});