I already tried to ban by IP, but these bots are some kinda of virus, 'cause it cames from many diferent IPs.

And they getting 'stronger' and more, in 7 hours 10 bots signed in in my site and spammed things in blogs.

Yes, I request email validation and them starting to valide them emails, don't know how.

Please, if someone found a solution, spreed it with us.