I had the opposite problem at my last company. When you hover over a link Apple's Mail app opens a preview of the page. So if you try to see the URL then you automatically visit the link and get sent for more training.

I learnt that all those emails were sent through some relay. I blacklisted the relay. And then, some real training email notifications were sent through the same relay. But that relay is used for phising, so I just refuse to open the training email. Win-win.

Isn't that behavior desactivable?