I just received a marketing email from Klarna. I have never signed up to it, but I read a news story quite recently that some online retailers use Klarna in the background to process card payments and the company sent out newsletters to people like me who had bought from such retailers without using Klarna's installments or whatever it is they offer, so assumed that's how they'd got my email address.
Then I did something that I now think might have been fucking stupid a bit risky: I saw the unsubscribe link at the bottom of the email and thoughtlessly clicked on it. Was taken to a "sorry to see you go" message. But what if it wasn't Klarna?! Could it have been a phishing scam and by following the link I've compromised my data? And what data might that be?! What can I do?