In my neck of the woods, the south, Georgia is the school that sends out a ton of mail. But I separate the general mail flyers about the program and university from mail about camps. Alabama sends a lot of DMs about camps. Pretty much every school sends out mail for camps. Our gym doesn't allow girls to go to college camps unless they are committed or finished their junior year of high school. It depends on what stage your daughter is at, is she heading into her recruiting summer? Your best conduit to determine genuine interest is talking to your DDs coach. They are in constant contact with the various programs and know which ones are genuinely interested.