Is there any way to add a registration challenge to the sign-up process to help stop spammers signing up? Last weekend our site was hit by such a concerted effort to signup and post spam that I had to disable sign-up and make it invitation only. We do like letting people sign-up without having to …

Hmmm, i’m not sure what solution you can use here. the spam bots use automated post requests to the sign up api endpoint, so any verification question in the UX might get bypassed anyways. i would suggest Discourse hCaptcha but i don’t think you can install it on the free tier. doesn’t look like i…

Perhaps Discourse AI’s Spam detection could help? It doesn’t stop registrations, but it hides spam posts. (Also see: Immediate actions you can take during a spam attack and Tips for Preventing Spam )

is the AI spam detection available for free plans? i’m not sure. i guess Discourse AI plugin is now. the AI spam detection works great if you can get it working for your site. i have it on mine and it keeps things nice and clean of bot nonsense.

Yep, I just checked: [Screenshot20260602070948Bing]

I assume the spam is coming from bots? (Does anyone spam manually nowadays? :thinking:) The approach will differ depending. An alternative to disabling sign-up altogether can be the must_approve_users site setting. But if the number of spam sign-ups is high, this might generate too much work for a…

[Screenshot20260602-114016] This plugin xb help

Desafio de registro para impedir registros de spam

Suporte

Heliosurge (Dan DeMontmorency) Junho 2, 2026, 2:42pm 7

Este plugin xb ajuda

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Desafio de registro para impedir registros de spam

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