Maybe whoever's hosting malfador.com has some sort of spam filter that prevents Messages from being sent to more than 5 addresses at a time...
Or maybe he didn't want one beta tester blowing the surprise by posting the entire list of testers on the Boards
that wouldn't explain why the rejected applicants got Messages in batches of 5...
Hmm, haven't heard from Suicide Junkie, I'd be shocked if he didn't get in, seeing as he knows SE4 inside and out!