Every tracked campaign email carries a few links that point back at Laureo: the click redirect behind each link in your body, the open pixel, the unsubscribe link in the footer, and the one-click unsubscribe header that inbox providers use for their own Unsubscribe button. By default those all sit on a standard shared host. If your workspace has verified its own tracking domain, campaigns build all of them on that domain instead, so a recipient who hovers a link sees a host that belongs to you.

Nothing else changes. The links do the same thing, opens and clicks are still recorded the same way, and the unsubscribe flow is identical. Only the host in front of them is different.

Open the Review step of the campaign composer and find the Tracking & category panel. The checkbox is Use your own tracking domain, and its note reads: Tracked links and the unsubscribe header use the domain set up in your workspace settings. If none is set up, links use the standard host and tracking still works.

• It is checked by default on every campaign, so opting out is a deliberate choice.
• Campaigns created before this setting existed also count as checked, so they pick the domain up the next time they launch.
• It is always shown, whether or not a domain has been verified. With none verified, leaving it checked simply changes nothing.
• Unchecking it keeps that one campaign on the standard host, even though other campaigns use your domain.

On the Business plan the domain lives at Settings → Campaigns → Custom tracking domain. On Ultra, where Cold Outreach shares the same domain, it lives at Settings → Cold Outreach → Custom tracking domain instead; your workspace has exactly one of the two cards. It is a subdomain you control, pointed at Laureo with a DNS record and then verified. One domain serves the whole organization, and only an organization-wide admin can change it; everyone else sees the same card read-only. Once it is verified there, campaigns start using it with no further setup. The full step-by-step is in Domain Setup.

A missing domain, a domain that has not finished verifying, or a lookup that fails all lead to the same place: the campaign uses the standard host, tracking stays exactly as you configured it, and the send goes out normally. The same fallback applies if the stored value is not a plain hostname when the email is built. A tracking-domain problem can never hold up a campaign or turn tracking off.

The moment a campaign starts sending, Laureo works out which host it should use and records it on the campaign. Every message from that point on uses the recorded host: the first batch, later batches, and every follow-up stage. That is what keeps one conversation consistent, so a recipient never sees one host on the original email and a different one on the reply that follows it. It applies to all three ways a campaign starts: sending it right away, a scheduled campaign reaching its send time, and an automation launching it.

• Verifying a domain does not move the links of a campaign that is already sending. Campaigns started after the domain is verified pick it up.
• Changing the checkbox on a campaign that has already launched does not change the host its messages use.
• Duplicating a campaign copies the checkbox but not the recorded host, so the copy works the host out again at its own launch.

Removing a tracking domain retires it rather than deleting it, and the daily re-check marks it as failed if the DNS record stops resolving. In both cases a campaign that had already recorded that host carries on using it for the rest of its run, so the one action that matters is to leave the CNAME record published. That is exactly why removing a domain is a retire and not a delete: the links already sitting in people's inboxes, including the one-click unsubscribe, resolve through that record and must keep working.

• Keep the DNS record published after retiring. Unsubscribe links in mail you already sent resolve through it, and the settings card shows the date to keep it until.
• The person who set the domain up gets a notification if it stops resolving, because until the record is republished the branded links the workspace already sent stop resolving too.
• A temporary lookup problem never changes anything. The daily re-check only marks a domain as failed when the record is authoritatively gone.
• A campaign that recorded no custom host stays on the standard host for good, even after a domain is verified later.

Adding, verifying, retiring, or replacing a tracking domain is included on the Business and Ultra plans. Once a domain is verified it keeps serving links on every plan: if your plan changes later, campaigns carry on using the host they recorded and the one-click unsubscribe header keeps pointing at the same place. Only the ability to change the setup follows the plan.

• Plain-text campaigns are covered too: the unsubscribe line in the text body is built on the same host as the header.
• The setting has no effect on which recipients are excluded. Opt-outs and suppression are checked the same way on either host.
• Your domain brands the links Laureo generates. It does not change your sending address, which still comes from the connected mailbox.
• Using a verified domain in a campaign adds no setup of its own. If your workspace has one, campaigns use it.