A tracking domain is the domain that appears in the links and open-tracking images of your emails. When an email platform tracks clicks, it rewrites each link to pass through its own server first, records the click, then sends the reader on to the real destination. By default, those rewritten links use the platform’s shared domain.
A branded tracking domain replaces that shared domain with one of yours, usually a subdomain such as links.yourbrand.com, connected to the platform with a CNAME record. Readers who hover over or long-press a link see your own name instead of an unfamiliar domain, which looks more trustworthy and consistent with your From address.
There is a deliverability reason too. Spam filters look at the domains in links. On a shared tracking domain, your links share a reputation with every other sender on the platform; if someone else abuses it, the domain can be flagged. With your own tracking domain, link reputation follows your own sending. It also keeps your domain aligned across From, DKIM and links, which presents a coherent picture to filters.
The tracking domain should use HTTPS. Many browsers warn about plain HTTP links, and some security tools treat them with suspicion. Choose a subdomain you don’t use for anything else, and keep the CNAME in place for as long as old emails might be clicked, otherwise links in past campaigns will stop working.
A Pune bike rental brand sets up links.ridebrand.in as its tracking domain. Before, links in its emails showed a long platform address; now they show its own name, and its link domain no longer depends on what other senders do.
MailNesto lets you use a branded tracking domain such as links.yourbrand.com, verifies its CNAME record and adds HTTPS automatically; until it is verified, links keep using the default address.