Drupal et les spam
https://www.ostraining.com/blog/drupal/block-spam-registrations-drupal/
- Mollom: https://drupal.org/project/mollom
- Stop Forum Spam: https://drupal.org/project/spambot
- Cloudflare: https://drupal.org/project/cloudflare
et surtout la page "spam prevention" de drupal: https://groups.drupal.org/node/77093