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What a custom tracking domain is
Email platforms measure opens and clicks by rewriting the links in your message so they pass through a tracking server first, and by adding a tiny image that loads when the email is opened. By default, those links and images use the platform’s own domain, which is shared by every customer on that platform.
A custom tracking domain replaces that shared domain with a subdomain of yours, such as links.yourdomain.com. It points to the platform through a DNS record, serves a valid SSL certificate, and redirects each click on to its real destination. To the recipient and to filters, the link now clearly belongs to you.
Why it matters
- Reputation: filters evaluate the domains in your links. A shared tracking domain carries the history of everyone using it, including senders whose practices you’d never accept.
- Consistency: a message from your domain whose links all point elsewhere looks mismatched. A custom domain keeps sender and links aligned.
- Trust: people who hover over a link before clicking see your name, not an unfamiliar one.
- Security: serving tracking over HTTPS avoids browser warnings and keeps redirects intact.
- Portability: if you change platform, your tracking domain’s reputation moves with you.
Signs you need one
You may need a custom tracking domain if your links show a platform’s domain on hover, if recipients report browser security warnings when they click, if a filter flags a link domain you don’t recognise, or if your tracking uses a raw IP address. Self-hosted platforms such as MailWizz, Postal or custom applications are the most common places where tracking is left on a default or insecure setting.
What’s included
- Choosing a subdomain that is clearly yours and separate from your main website.
- The CNAME or A record pointing it to your sending or tracking platform.
- An SSL certificate issued and set to renew automatically, whether through the platform or on your own server.
- Platform configuration so all new campaigns use the custom domain for clicks, opens and, where relevant, unsubscribe links.
- Redirect behaviour checked for speed and correctness on desktop and mobile.
- Test sends confirming every link resolves through the new domain over HTTPS.
How we deliver it
- Review how your current platform tracks and which domains appear in a sample email.
- Agree the subdomain and publish its DNS record.
- Issue the certificate and confirm HTTPS works before switching anything over.
- Update platform settings, including per-list or per-customer tracking domains on multi-brand platforms.
- Send tests to major providers, click every link, and check the redirect chain.
- Document the setup, including certificate renewal and what to do if the platform’s target changes.
Reading tracking data honestly
A custom domain makes tracking more trustworthy, but it doesn’t make the numbers exact. Mailbox privacy features can preload images, and corporate security scanners often click links automatically to check them. Opens and clicks are useful for comparing campaigns and spotting trends, not as precise counts of human behaviour. We help you interpret them with that in mind.
What affects timeline and cost
- Number of brands or sending domains that each need their own tracking domain.
- Whether the platform issues certificates itself or they must be managed on your server.
- Access to DNS and platform settings.
- Existing campaigns and templates that need updating.
Common mistakes
Pointing the tracking subdomain correctly but never enabling HTTPS, so clicks trigger warnings. Using the main website domain, so a tracking problem affects the site. Letting the certificate expire. Setting a custom domain for clicks but leaving opens or unsubscribe links on the shared one. Creating a tracking domain on a brand-new, unrelated domain, which looks less trustworthy than a subdomain of your own.
Related: MailWizz installation and configuration, DNS configuration, all email infrastructure services, and the email infrastructure guide. Contact us to set yours up.
Frequently asked questions
Will a custom tracking domain improve deliverability?
It removes a risk you don’t control and keeps your links consistent with your sender identity. It won’t fix other problems, but it stops a shared domain’s history affecting you.
Should I use my main domain or a subdomain?
A subdomain of your main domain, such as links or click. It stays clearly yours while remaining separate from your website.
Does tracking slow down clicks?
A well-configured redirect adds very little delay. We test the redirect chain to make sure it stays short.
Can I turn tracking off entirely?
Yes. Some senders disable tracking on transactional mail or for privacy reasons. You lose engagement data, which is a trade-off we can talk through.
Do I need one per brand?
Ideally yes. Each brand’s links should match its own domain, so reputation and trust stay separate.
Talk to us about custom tracking domain setup
Open and click links served from your own domain instead of a shared, often-blocked one.