Quix0r said:
Forget my first suggestion. I have done it here and they still spam on the renamed script. They have smarter bots than I have thought.

while anti spam method become more and more effective, spam bots also getting better and smarter, i guess that’s what ppl called as improvement?? just like last time captcha was the best method to prevent spams but now most of the spam bots can easily get through it.

Their bots seems to prefetch the page for analyzing (e.g. finding the correct script location).

i think you can try Akismet together with SK2, it’s sufficient enough to stop spams, however if you want to be mean, use Bad Behavior also.

as for Math Comment Spam Protection Plugin, i thought of using captcha or any similar solution before, but i also dun want my commenter to do “too much” thing before they post, so i choose not to use them.