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Mod Name:BotScout "BotBuster" for SMF 1.x and 2.0
http://custom.simplemachines.org/mods/index.php?mod=1599
Type:Security and Moderation

Prevent spambots from registering on your forum. The SMF BotBuster uses the BotScout.com API to check each attempted registration against the BotScout.com database of known bots. Both the email and IP address are tested against over 100,000 bot signatures

หลังติดตั้งเสร็จไม่ต้องตั้งค่าอะไร
You could turn the  email notifications on for a few days and see if you're getting any alerts.