Today liukang has suggested some software that will fight against blog spamming. They are:

http://www.jayallen.org/projects/mt-blacklist/

and

http://www.neuro-tech.net/archives/000315.html

The first is MT plugin and the second is its data automatic updater.

I’ve no time to turn them into ports at this time. Will try them on my box and if I have time I will port them.