You're sending cold emails and your open rates are decent. Then you add a redirect domain - a separate domain you use just for tracking clicks - and suddenly everything breaks. Your emails land in spam, your sender reputation tanks, or worse: you don't even realize what happened until your reply rate drops 40%.

The problem is that most people set up redirect domains wrong. They either skip the setup entirely, use them on the wrong domain, or don't understand how ESPs and mailbox providers actually handle the redirect traffic. This guide walks through exactly how to set up a redirect domain that tracks clicks without nuking your deliverability.

Why You Need a Redirect Domain (And Why You Can't Just Use Your Main Domain)

A redirect domain is a separate domain you use for click tracking links in your emails. Instead of sending people directly to your website, the email contains a link that points to your redirect domain first, logs the click, then sends the user to your actual destination.

The reason you can't just use your main sending domain for this is simple: click tracking generates a ton of traffic. Every time someone clicks a link, that redirect domain gets hit. If you use your main domain, you're sending your domain's IP reputation into the blender every time someone clicks an email. Mailbox providers see that traffic pattern and flag it as suspicious - because it is, from their perspective. A real company's domain doesn't get hammered with redirect traffic the way a cold email domain does.

Your redirect domain takes the hit instead. Your main sending domain stays clean.

The Right Way to Set Up a Redirect Domain

Step 1: Register a Domain That Looks Like Yours

Your redirect domain should look like it belongs to your business. Not something random or obviously separate. If your company domain is acmeconsulting.com, use something like acmeconsulting-track.com or track-acme.com. The idea is plausible deniability - if someone manually checks the link before clicking, they see something that looks legitimate.

Register it at the same registrar as your main domain. You'll need to set up DNS records.

Step 2: Set Up DNS Records Correctly

Most ESPs that handle redirect domains (like Klaviyo if you're doing email marketing, or your cold email platform if it has built-in tracking) will give you specific DNS records to add. You'll usually need:

The critical part: make sure your ESP actually owns the infrastructure on the other end. If they don't have a solid reputation, your redirect domain will inherit that reputation. You're trusting them with your click tracking traffic.

Step 3: Don't Send Mail From Your Redirect Domain

This is the mistake that kills most people. Your redirect domain should ONLY handle click tracking. It should never send outbound email. Never. If it starts sending mail, mailbox providers flag it as suspicious (because it is - why would a tracking domain send email?), and it tanks your reputation faster than anything else.

Configure your ESP so that your redirect domain is excluded from any outbound sending rules. Your main domain sends the emails. Your redirect domain only receives click traffic.

Testing Your Redirect Domain Before You Scale

Before you load up 5,000 emails using your new redirect domain, test it.

Test 1: Send to Your Own Inbox

Send a test email from your main domain that includes a click tracking link using your redirect domain. Click the link. Verify that:

Test 2: Check Redirect Domain Health

Run your redirect domain through MXToolbox and similar checkers. You're looking for:

Test 3: Small Volume Test (100-200 Emails)

Send a small batch of emails to a list of known good addresses (warm emails to contacts who've actually engaged with you before). Monitor for:

If everything lands in inbox and tracking works, scale up. If you see deliverability drops, your redirect domain is already flagged. Stop and diagnose.

Common Mistakes That Tank Your Redirect Domain Fast

Reusing an old domain. Don't use a redirect domain that previously sent a ton of mail. It carries its reputation with it. Register something new.

Using the same redirect domain across multiple sending accounts. If you run multiple cold email accounts, give each one its own redirect domain. If one account gets flagged and starts sending spam, your redirect domain gets blacklisted, and it affects all your other accounts. Isolate the risk.

Not warming up the domain first. Your redirect domain doesn't send email, but it still has an IP reputation. If it suddenly starts receiving massive click traffic from day one, that's suspicious. Start with a small volume and ramp up over a few weeks. The same principles of domain warm-up apply here.

Ignoring the ESP's documentation. Different platforms handle redirect domains differently. Read your ESP's setup guide completely. Ask support questions if something is unclear. A 10-minute setup conversation now saves you a blacklisted domain later.

How to Monitor Your Redirect Domain Health Ongoing

Once you're running at scale, check your redirect domain once a week:

If you notice reputation issues early, you can rotate to a new redirect domain before it becomes a problem. If you wait until you're blacklisted, you've got weeks of cleanup ahead.

Redirect Domains and Your Overall Email Infrastructure

Your redirect domain is part of a larger system. It works best when you've already handled the foundational infrastructure correctly - separate sending domains, proper IP configuration, clean lists, and realistic sending volumes. If your baseline infrastructure is sloppy, a redirect domain won't save you. If it's solid, a redirect domain stays clean and just works.

The goal is simple: track your clicks without sacrificing your sender reputation. Done right, a redirect domain is invisible - it just works, and you get accurate click data. Done wrong, it's a silent reputation killer that you don't notice until your metrics tank.

Related Guides