It's hard to know for sure. The best advice is to not adjust your own rank list based on anything other than where you would like to go. How a program ranks you and how you rank them should be two completely independent events.
That being said... at my program (and probably many others), if you receive an email, that means we liked you and you are "ranked to match." In other words, based on the rank order lists from prior years, you will match at our program if you ranked us #1.