For confidentiality reasons, I believe that no ABA law school will send acceptance or rejection letters via email. Only snail mail. Pisser, huh!
Not so...I heard from both Cornell and Boston College via email long before (several days, anyway) anything showed up via post. Cornell sent a full-blown "congratulations - you're in!" email complete with graphics and BC sent an invitation to some event that sort of just assumed I already knew I'd been admitted.