I run explorexxx.com and I actually send out rejection emails. They are premade and I pick one that suits the rejection reason if there is a reason. I do not reject many sites other than over used sponsor content.
So this morning I reject a site for this:
"Reason:
Content doesn't match. Please don't mix hardcore galleries with posing galleries. Make it a site with matching content please."
Figure I may as well try to help webmasters figure out why they are rejected so they can listed next time.
Just now I got this response:
"idiot"
That's it. Nothing else. Just called me an idiot. No more listings for him.
FYI. That's why some sites do not bother with rejection emails.