---
title: "Custom Tracking Domains"
description: "Resend has launched custom tracking domains, making the feature free for all users. Email tracking typically relies on shared domains, so another sender’s reputation can affect deliverability. Users configure the feature at the domain level by adding a required DNS record, after which Resend routes tracking through the custom domain; both click and open tracking are disabled by default. Click tracking records link clicks through redirects, while open tracking records image downloads from a 1x1 transparent pixel. Custom domains align tracking links with the sending domain, avoid unfamiliar recipient-facing domains, and can improve deliverability; API configuration accepts open and click tracking flags plus a tracking subdomain, while webhooks emit real-time open and click events."
---

# Custom Tracking Domains

[Resend](https://yomu.fyi/company/resend) · Apr 16, 2026

**Type:** Announcement

## Summary

Resend has launched custom tracking domains, making the feature free for all users. Email tracking typically relies on shared domains, so another sender’s reputation can affect deliverability. Users configure the feature at the domain level by adding a required DNS record, after which Resend routes tracking through the custom domain; both click and open tracking are disabled by default. Click tracking records link clicks through redirects, while open tracking records image downloads from a 1x1 transparent pixel. Custom domains align tracking links with the sending domain, avoid unfamiliar recipient-facing domains, and can improve deliverability; API configuration accepts open and click tracking flags plus a tracking subdomain, while webhooks emit real-time open and click events.

## Context

Shared tracking domains mean reputation can be shared among senders. The feature is presented as a way to align tracking links with the sending domain and support deliverability.

## Approach / What changed

In the Domains configuration for a domain, users add the required DNS record and enable custom tracking. Resend then routes click and open tracking through that domain. The same settings can be supplied through the API or CLI, including open tracking, click tracking, and a tracking subdomain; tracking domains can also be verified through the API.

## Takeaways

- Click tracking uses a redirect for each email link, records the click, and then forwards the recipient to the original URL.
- Open tracking embeds a 1x1 transparent image; an open event is recorded when the recipient’s mail client downloads it.
- Custom tracking domains can be combined with webhooks, which emit real-time events for every open and click.

## FAQ

### How are custom tracking domains enabled?

In Resend, open the domain’s Configure tab, add the required DNS record, and configure tracking at the domain level. The same options can be supplied when creating or updating a domain through the API or CLI.

### Are click and open tracking enabled automatically?

No. Both features are disabled by default and can be enabled independently at the domain level.

### What does custom tracking change for recipients and deliverability?

Tracking links pass through a domain owned by the sender instead of a shared domain, aligning them with the sending domain. Recipients also do not see an unfamiliar domain in the links they click, and the post says this alignment is better for deliverability.

**Tags:** [API](https://yomu.fyi/topic/api), [DNS](https://yomu.fyi/topic/dns), [Email Marketing](https://yomu.fyi/topic/email-marketing)

- Source: [Resend](https://resend.com/blog/introducing-custom-tracking-domain)
- Source URL: https://resend.com/blog/introducing-custom-tracking-domain
- Ingested by Yomu: 2026-09-19T09:54:26.776Z

[Read original post](https://resend.com/blog/introducing-custom-tracking-domain)