Send Email from Gmail to Slack with Google Script

Published in: Gmail - Google Apps Script

You can easily publish important email messages coming into your Gmail to a Slack channel using Google Apps Script. Your Slack channel has a Webhook URL and you can send a POST HTTP request to this URL with the email message in JSON format as the payload parameter.

You can archive the message, or apply a specific Gmail label, to prevent duplicate posts in Slack for the same message. Credit: @matsuyoro

var postUrl = '';
var postChannel = '#labnol';

function postGmailToSlack() {
  var threads = GmailApp.getInboxThreads();

  for (var m in threads) {
      threads[m].getFirstMessageSubject() +
        ' link:' +

function sendHttpPost(message, username) {
  var jsonData = {
    channel: postChannel,
    username: username,
    text: message,
  var payload = JSON.stringify(jsonData);
  var options = {
    method: 'post',
    contentType: 'application/json',
    payload: payload,

  UrlFetchApp.fetch(postUrl, options);
📮  Subscribe to our Email Newsletter for Google tips and tutorials!
Published in: Gmail - Google Apps Script

Looking for something? Find here!

Meet the Author

Web Geek, Google Developer Expert
Amit Agarwal

Amit Agarwal is a Google Developer Expert in Google Workspace and Google Apps Script. He holds an engineering degree in Computer Science (I.I.T.) and is the first professional blogger in India. He is the developer of Mail Merge for Gmail and Document Studio. Read more on Lifehacker and YourStory

Get in touch

Google Add-ons

Do more with your Gmail and GSuite account

We build bespoke solutions that use the capabilities and the features of Google Workspace for automating business processes and driving work productivity.

  1. Mail Merge with Attachments
    Send personalized email to your Google Contact with a Google Sheet and Gmail
  2. Save Emails and Attachments
    Download email messages and file attachments from Gmail to your Google Drive
  3. Google Forms Email Notifications
    Send email notifications to multiple people when a new Google Form is submitted
  4. Document Studio
    Create beautiful pixel perfect documents merging data from Google Sheets and Google Forms
  5. Creator Studio for Google Slides
    Turn your Google Slides presentations into animated GIFs and videos for uploading to YouTube