Don't trust any emails from a seemingly legit PayPal sender claiming someone unauthorized is using your PayPal account. It's a phishing scam and if your PayPal address is on any public website they can extract your email account used!
Mirror Online: PayPal 'unusual activity' email SCAM attempts to dupe users - don't fall for this hacking hoax. PayPal 'unusual activity' email SCAM attempts to dupe users - don't fall for this hacking hoax - Mirror Online
Mirror Online: PayPal 'unusual activity' email SCAM attempts to dupe users - don't fall for this hacking hoax. PayPal 'unusual activity' email SCAM attempts to dupe users - don't fall for this hacking hoax - Mirror Online