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Using a custom domain name for email tracking

If you have open and click tracking enabled for your email campaigns, Direct Mail inserts tracking URLs into your outgoing emails. Part of that tracking URL may contain a domain name that is shared with other Direct Mail users. Using a custom tracking domain name will help protect your email reputation from being influenced by the reputation of other Direct Mail users.

If you already own a domain name (for either business or personal reasons), then adding a custom tracking domain name should cost you nothing extra and is easy to set up. Below please find the technical details, as well as links to instructions for many of the top domain name registrars (e.g. GoDaddy, Network Solutions, Namecheap, etc.) on how to set up the custom tracking domain name.

Technical Details

You will need to choose a subdomain off of your root domain, and then create a CNAME record for that subdomain that points to one of e3 Software's tracking servers. You can find out what domain name the CNAME record should point to by consulting your Direct Mail Account control panel:

  1. Open Direct Mail
  2. Choose Direct Mail > Direct Mail Account from the menu bar at the top of the screen
  3. Scroll down to the Tracking Domain Name section and click Change.


Let's say you own the domain name and wanted your custom tracking domain name to be Let's also say that you followed the three steps above and determined that should point to You would then go to the website of your DNS provider (or web hosting provider) and create a CNAME DNS record that points to

Instructions for Popular Domain Name Registrars

Here are instructions for setting up a CNAME record for some of the popular domain name registrars:

I've got my CNAME record set up, how do I input it into Direct Mail?

Once you've set up your CNAME record, you'll need to enter it into Direct Mail. Here's how:

  1. Choose Direct Mail > Direct Mail Account from the menu bar.
  2. Scroll down to the Tracking Domain Name section and click Show.
  3. Enter your subdomain ("" in the example above).
  4. Click Change.

Once you've set up your own custom tracking domain name, then any tracking URLs that Direct Mail inserts into your message will look like they came from you. This will help protect your email reputation and give your emails a more professional appearance. If you have any questions on setting up CNAME records, please try contacting your domain name registrar.

Custom Domain Names and HTTPS URLs

Even if you have a custom tracking domain name set up for your account, Direct Mail will revert to the standard tracking domain name for links that use HTTPS URLs. This is because the SSL certificate presented to user agents by our tracking servers cannot validate for custom, arbitrary hostnames. An invalid certificate would mean that the user would see warnings in their browser about an "insecure website", and it could potentially cause issues with spam filters.

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