HawkOpen checks these choices for every recipient copy before it adds a pixel or tracked links, and no account setting overrides them. Measuring also stops in emails the company sent before.
The privacy page is linked from the page behind the link. There the recipient confirms the address with a one-time code and can choose “Do not track me” for every sender, which also deletes the earlier tracking data in every company, download their data or request erasure. That general setting can be switched back on later; even then, only a company with a recorded consent of the person tracks them.
Where rules that require consent apply, tracking may start only after that consent has been obtained. The link in the message lets the recipient withdraw consent later.