Privacy proxies, caches and security scanners cause many of these events, so HawkOpen never presents an open as proof that someone read the email.
Recipients who do not want this can refuse tracking by that company through the link “Do not track my activity” in the notice, or by every HawkOpen sender on the HawkOpen privacy page; either way, what was measured about them before is deleted. Turning off image loading in a mail app also stops tracking images.
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.