One safeguard Paypal gave me years ago when I got one of those scam emails was that if there were an actual memo from Paypal, it would have my name in it. It would never be a genral greeting like "Dear Member."
After that phone call, I realized just about all the businesses I frequent use that same naming technique. It doesn't mean it's not a scam if you see your name, but it's just less likely. Still, follow the advice not to click on email links unless you have some way to know FOR SURE who it is sending you that link.