I would suggest your Q&A is too easy, I translated the relevant information from Spanish to English got the answer and registered successfully. If I can do that so can a spambot.
Having the Newly Registered User group active basically means that the first number of posts of a new user, set by the threshold set in “New member post limit”, have to be approved by a moderator, two is usually ok. I can’t say I’ve known any spambot bypass the NRU since it has been available.
I suggest you beef up (¿reforzar?) your Q&A and activate the NRU. Also, if you have moderators approving posts ask them not to until you’re happy the Q&A and NRU are working correctly.
- "The more connected we get the more alone we become" - Kyle Broflovski©
- "The good news is hell is just the product of a morbid human imagination.
The bad news is, whatever humans can imagine, they can usually create." - Harmony Cobel