This zip file contains a set of six new blog spam rules designed to reduce blog comment spam for sites running Community Server 2.1. Included in the assembly are the Anonymous User, Comment Length, Single Email, Flood from IP, Recent Duplicate, and Regex blog spam rules. A brief description of each rule is included in the readme.
To install, just add the assembly to your Web\bin folder and enable the rules via Control Panel > Administration > System Tools > Manage Spam Blocker.
Please post any questions or comment about these spam rules in the forums.