You can't - they're everywhere. Speaking of spam, check this out:
If you want to stop blog spam, do a google search for "mt-blacklist". Or upgrade to the latest pay version of movabletype, and turn on typekey authorization.
I use mt-blacklist, with a php script that update the list twice a day. It gets most of the spam out.
Posted by: vivek at July 20, 2004 05:01 PMThanks, Vivek. I scrubbed the shit out of this site with mt-blaklist.
Posted by: G at July 24, 2004 05:34 PMFor real protection, you're going to have to set up a script and cron job to update that blacklist every day or so.
Posted by: vivek at July 25, 2004 07:47 AM