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Have you tried using Cloudflare? https://support.cloudflare.com/hc/en-us/articles/200170066-Will-activating-Cloudflare-stop-all-spammers-or-attackers- https://

• zaphodq 7y ago
  Cloudflare will provide some protection. But is there anything specific to this problem? Captcha is one solution but how are websites like basecamp and intercomm are doing it?