It depends what the email was about. If its content reads like "test email" or some nonsense like that, nevermind. But if it looks like a legit email that would

It depends what the email was about. If its content reads like "test email" or some nonsense like that, nevermind. But if it looks like a legit email that would have significant consequences for the recipient, were it legit, it should definitely be clarified what's up. Also, a well-crafted email will hopefully prevent people invoking the GDPR on the sender.