Everyone who receives introductory recruiting correspondence should keep in the mind that it's not unusual for baseball programs to build databases numbering in the hundreds for each recruiting class (I've heard 800-1,000 in some cases.). One of the methods they employ is to routinely place every participant at certain showcases on their mailing list, regardless of whether they saw them play. Doing this early in the process, they figure that the subsequent combination of individual expressions of interest they receive and their own, in-person efforts will narrow the field to a more manageable number of players who are actually being recruited.
Obrady, this is not to say that your son's not one of that program's chosen few. He may be. However, my advice to you and every other family who's interested in a school that contacts them is to make certain that they let the program know of their specific interest. Otherwise, you risk being nothing more than a line on the database spreadsheet.