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This thread is in the WebmasterWorld Supporters Forum, so you need to have a paid subscription to read it (go pay!). :) Brett named it MSN Goes after Blog Spam. Basically, MSN's way to block blog spam is to moderate each and every comment submitted. Now that is a lot of work. I use the all powerful MT-Blacklist/Comment Spam Clearinghouse. More info here.
Got to go.
