I was recently subscribed to ~500 newsletters within 10 minutes, and the most annoying ones to unsubscribe where from Brasil, US, India, etc. (An attacker used

I was recently subscribed to ~500 newsletters within 10 minutes, and the most annoying ones to unsubscribe where from Brasil, US, India, etc. (An attacker used the paypal guest account feature and used my IBAN [european bank account number] and tried to hide the mail within those hundreds of mails. They were successful for some days, until the purchase showed up on my bank account)