I never said I knew exactly how to do it. I was simply pointing out a fact based on my experience. I've been on forums since there was an internet. All of them have spammer problems and some of them have been able to completely block them out. I don't know how their forum back ends looked or what programs/software ran the security so I don't know if their specific solutions would work. I can try to find out, though, if a moderator wants me to. I have friends who are computer security experts, and they may have some ideas. I can also poke moderators at forums that have dealt with spammers successfully and see what they did. I'd be happy to put my research skills to use here. Just let me know and I will be off
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I know enough about computers to be dangerous. If its possible, I'd suggest trying to block user names, emails, or IP addresses. That last is less and less useful though due to the growth of dynamic IP. But its where I'd start. If the software allows it and if people have the time to do it. And those are big ifs, yes, and that's fine.
Computer security is one of those things you can never get completely right. A completely secure system is expensive, time consuming, and unusable. So, you want to get the most useful security you can for the most reasonable price (which is sometimes $0). And that means stuff like this happens sometimes, and that's the way it is. But, like I said, I would be willing to help figure out how to make it better, if that's helpful.