Nodemailer官网

nodemailer/nodemailer

1. Gmail直接登录法

或者两步验证开启后使用应用专用密码登录

126邮箱类似，但要在设置里开启客户端授权密码

Node.js Send an Email

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var nodemailer = require('nodemailer');

var transporter = nodemailer.createTransport({
  service: 'gmail',
  auth: {
    user: 'youremail@gmail.com',
    pass: 'yourpassword'
  }
});

var mailOptions = {
  from: 'youremail@gmail.com',
  to: 'myfriend@yahoo.com',
  subject: 'Sending Email using Node.js',
  text: 'That was easy!'
};

transporter.sendMail(mailOptions, function(error, info){
  if (error) {
    console.log(error);
  } else {
    console.log('Email sent: ' + info.response);
  }
});

2. Gmail使用SMTP服务器OAuth2登录

https://nodemailer.com/smtp/oauth2/#examples

token获取方式
Nodemailer/Gmail - What exactly is a refresh token and how do I get one?

Step 1: Obtain OAuth 2.0 credentials at Google Developers Console
获得Oauth的clientId和clientSecret
Step 2: Obtain the refresh token at Google OAuth2.0 Playground
获得refreshToken和accessToken
查看具有帐号访问权限的第三方应用
https://myaccount.google.com/permissions
已经能访问Gmail

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var nodemailer = require('nodemailer');

let transporter = nodemailer.createTransport({
    host: 'smtp.gmail.com',
    port: 465,
    secure: true,
    auth: {
        type: 'OAuth2',
        clientId: '18860796297-6tpjt9moo4rbptpipoq462c0uc7cqvsu.apps.googleusercontent.com',
        clientSecret: '-HaMhhLnpDHt2dppuc8BUFWw'
    }
});

var mailOptions = {
    from: 'my-gamil-account@gmail.com',
    to: 'friend-gamil-account@gmail.com',
    subject: 'Sending Email using Node.js with XOAuth2',
    text: 'That was easy!',
    auth: {
        user: 'my-gamil-account@gmail.com',
        refreshToken: '1/m4HwkILnng_YlU2TGJGt8VYSLtTafkbVP6coOAeNcCw',
        accessToken: 'ya29.GltHBg6nl8YiXlOMEa4CErjUpQssgbgQhc5dYqirQ8MgXhbe7K7Q6dBHuJU2GdWC6ZP5OH5CbOTnfPbtoebqTBGbEPNMX4xFiQ0FlZn-3zKDhnjMlJ3Iu6VAKySK',
        // expires: 1484314697598
    }
};

transporter.sendMail(mailOptions, function (error, info) {
    if (error) {
        console.log(error);
    } else {
        console.log('Email sent: ' + info.response);
    }
});