Open and Click Tracking

Open and click tracking is disabled by default for all domains. You can enable it manually or programmatically.

Using the dashboard
Using the API

Go to the Domains page and click on the domain you want to configure.In the Configuration tab, you can enable open and/or click tracking.

You can also programmatically enable open and/or click tracking by using the API.

import { Resend } from 'resend';

const resend = new Resend('re_xxxxxxxxx');

const { data, error } = await resend.domains.update({
  id: 'b8617ad3-b712-41d9-81a0-f7c3d879314e',
  openTracking: false,
  clickTracking: true,
});

View the API reference for more details.

For best deliverability, we recommend disabling click and open tracking for sensitive transactional emails.

How Open Tracking Works

A 1x1 pixel transparent GIF image is inserted in each email and includes a unique reference to this image file. When the image is downloaded, Resend can tell exactly which message was opened and by whom.

How Click Tracking Works

To track clicks, Resend modifies each link in the body of the HTML email. When recipients open a link, they are sent through a Resend server, and then immediately to the URL destination.

Custom Tracking Domain

You can configure a custom domain for all click and open urls in your emails. When configured, Resend modifies each link in the body of the HTML to pass through Resend servers using this domain.

Custom tracking domains are currently in private alpha and only available to a limited number of users. APIs might change before GA.To use the methods on this page, you must upgrade your Resend SDK:

npm install resend@6.10.0-preview-tracking-domains.0

A tracking domain will always share the same root domain as your sending domain. This improves deliverability and brand consistency. Similar to verifying your sending domain, you will need to add a CNAME record to your DNS settings to verify your tracking domain. Once verified, all tracked links in your emails will use your custom tracking domain (e.g., links.emails.yourdomain.com). Here’s how to configure a custom tracking domain.

Using the dashboard
Using the API

Look for the Custom Tracking Domain section, and click on Configure.

Then, you will need to add a CNAME record to verify your tracking domain.

Once verified, all tracked links in your emails will use your custom tracking domain.

You can also create a custom tracking domain by using the API.

import { Resend } from 'resend';

const resend = new Resend('re_xxxxxxxxx');

const { data, error } = await resend.domains.trackingDomains.create(
  'd91cd9bd-1176-453e-8fc1-35364d380206',
  {
    subdomain: 'links',
  },
);

Then, you will need to verify the tracking domain.

import { Resend } from 'resend';

const resend = new Resend('re_xxxxxxxxx');

const { data, error } = await resend.domains.trackingDomains.verify(
  'd91cd9bd-1176-453e-8fc1-35364d380206',
  'a1b2c3d4-e5f6-7890-abcd-ef1234567890',
);

Once verified, all tracked links in your emails will use your custom tracking domain.

Documentation

Quickstart

Learn

Resources

Open and Click Tracking

How Open Tracking Works

How Click Tracking Works

Custom Tracking Domain

Documentation

Quickstart

Learn

Resources

​How Open Tracking Works

​How Click Tracking Works

​Custom Tracking Domain

How Open Tracking Works

How Click Tracking Works

Custom Tracking Domain