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如何在Heroku上透過node.js去寄信呢? 可參考官方網站 sendgrid#nodejs

指定sendgrid的版本

package.json

{
  "name": "node-sendgrid-example",
  "version": "0.0.1",
  "dependencies": {
    "express": "2.2.0",
    "sendgrid": "0.2.1",
  }
}

sendgrid.js

var SendGrid = require('sendgrid').SendGrid;
 
//取得帳號密碼
var sendgrid = new SendGrid(
  process.env.SENDGRID_USERNAME,
  process.env.SENDGRID_PASSWORD
)
 
sendgrid.send({
  to: 'recipient@example.com', 
  from: 'sender@example.com',
  subject: 'Hello World',
  text: 'Sending email with NodeJS through SendGrid!'
});

這樣就可以收發信件了，Heroku免費的一個月可以寄送6,000封信，非常的方便