Hi Stefano! Thx for the reply. I already blacklisted mail.ru.
Now they switch domains – latest is bk.ru witch seems to be a alternative domain for mail.ru useres becaus the mailer deamon comes from mail.ru.
Is it possible to block all .ru domains like blacklisting *.ru?
Would be great to have a possibility to integrate ReCaptcha anyway… 🙂
THX again!