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I just wanted to ask.
Rather then using a Captcha or as well as using one would there be value in keeping a list of the IP address that have used the form and start to block adding if it breaks a condition like 5 per minute?
any thoughts?
thx
This solution would block legitimate user who’re posting fast – you should present a CAPTCHA to those. Bear in mind that multiple people may share an IP address via NAT.
Also, you would still get spam, but only once per IP address. Since spammers often use large botnets with thousands or millions of IP addresses, they could easily send thousands or millions of spammy messages.