This. Also, don’t require logging in (you can figure out the e-mail address), and don’t ask which types of marketing e-mails they’d like to unsubscribe from. Unless, of course, if your app sends notifications the user actually signed up for.
Hi internet companies! 👋 It's pretty simple: no one clicks on those barely visible 'Unsubscribe from these emails' buttons accidentally. So there's absolutely no need for a confirmation screen. Either it's a one click experience or I will report you as spam 🛑🛑🛑— Antek Piéchnik (@antekpiechnik) June 26, 2019