Behzad, I appreciate your concern ... and we are working on it. My technical support team and I skim for spam regularly, but there are times of the day it will make it out there for a few hours before we can get to it. It's one of the unfortunate things about having a forum that is highly ranked in the SEs ... others want to piggy back with their garbage. :P
We're on course for a major upgrade in the coming months that should all but eliminate the problem.