For PSAs coming in for the very first time in My opinion, I will say if your enrolling speed is 5 per week it will be,wise to treat them with some form of a warm welcoming smile by greeting them with their first Name mentioned on your Mail to them.
For your first impression leaves a lasting mark or sign in their memories for life. For every one is customer treat them nicely the first time you keep them loyal for life, how about that?