When you get emails like that first grammar usually gives it away, then many times it will say "Dear member" not your name. Last give away is go to the link and hover your cursor over it then look at the bottom of the screen. It will show you the link it is routing you to. It will not be Paypal.
Best way is anytime you get a message like that do not click any link, it could still upload a virus just by clicking on it. Instead go directly to the site itself and log in there. If the issue is legit it will show up there as well.