forum spamming

So, I go to check my email, and I find I had a returned message from the user that sends out messages to radioclub forum users. It looks as if someone with the username criminal record tried to register to the forums to get his url linked. It won’t work, however, because I recognize this and deleted the user. It must have been something automatic, because there is no visible links to the registration form that doesn’t require you registering with the rest of the site first.

This is the first time I’ve come accross a spamming of this sort to any of my sites. I wonder how I should protect it. Maybe one of those graphical images that has a word in it that requires the user to type the word. Hmmm.

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