Php-Fusion v6 security system - image check were been broken. And that's notified in a lot of sites. Typical bot:
IP mostly begins with 64.xxx.xx.xx (ex. 64.251.27.63),
Typical e-mail bot format - u2xx.xx.xxx**@*****.info,
and nicknames have 2 parts - name ar 5-6 chars.
That bot is mostly spaming default fusion sites comments system and collecting members e-mail addresses.
Suggestion - wait for Php-Fusion v7 security updates(or v6.01.11) with image captcha and e-mail encoding technology. These updates should solve your problems for a while, becouse, as I know, even this site e-mail encoding were bypassing by bot.
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