Maybe sometimes, but don't count on it always. The email I got was one sentence long, the "from" email was correct from paypal (I compared it to others legit messages). It was one sentence long with a link enclosed to the "item" (Myst III) I supposedly purchased and was being billed for. It never came from Paypal however and the link would install a virus from what I learned later. I forwarded it Paypal to investigate and deleted it before opening it.