A use case · email and outreach
Change sequencer. Keep the links you already sent.
Sales engagement platforms rewrite every link in every email to their own tracking domain. That is the deal: they get the click data, and you get links that stop resolving the day your contract does.
What it is for
Three things a sent link has to survive.
The links are collateral in the renewal
Two years of sequences, every link rewritten to a hostname you do not own. Migrating tools means every email already in somebody’s inbox points somewhere that no longer answers.
Opens are not clicks
An open fires when a mail client prefetches an image, which is most of the time and none of the interest. A click is a decision, and it is the only one of the two worth reporting.
Some links should stop working
A quote, a data room, a trial invite. A date rule sends anyone arriving late to a page that says so, which beats a 404 and a prospect who assumes you have gone out of business.
The moment it matters
Month three of a sequence.
The one-pager is replaced. The link to it is in four hundred emails that have already gone out, a calendar invite, and two signatures.
Change the destination once. The prospect who opens a month-old email gets the current file rather than a dead link and a bad impression.
Doing it on your own domain is what makes it yours to change. On your sequencer’s, this page is their feature and it stops when you stop paying them.

Point one subdomain at it before the next sequence.
That is the part that is hard to do later. Everything else on this page is a consequence of it.