I put together 2 ways you could stop phpBB3 spam bot registrations, this post and the video. Start by logging into your forum admin panel. Click User Registration Settings, make sure Admin is selected and click submit. Next click on Spambot Countermeasures, make sure Enable Spambot Countermeasures for Registrations is Enabled. Go down to Installed Plugins and make sure Q&A is selected. Click on the Configure button, now you can add a question. Once you have your question in place, save it. I hope this helps!
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