The notice is short and readable, in one of seven languages chosen from the text of your email, English when unsure. Opening the link refuses tracking by your company at once and deletes what was measured about that address before; no one in your company can switch it back. After that, your later emails to that address go out without the tracking image and without tracked links.
If you do not want to track certain people at all, you can exclude addresses, domains or countries in your settings. And if you need certainty that someone read your message, the honest way is to ask for a reply.
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.